Tyan Motherboards


Tyan S1571 Upgrade Page


Updated 9/16/01


NEW! New BIOS Available! NEW!


This page is dedicated to upgrading and enhancing the Tyan S1571 Titan Turbo AT-2 motherboard. Although Tyan doesn't support the use of processors above those recommended in the manual, the S1571 is very capable of handling CPU's above and beyond the specifications.

Note to all Socket 7 board users: Most of the information on this page applies to all socket 7 boards. However, there are three major questions that must be answered before trying a newer processor on your specific board. They are as follows:

1) Does the BIOS support the newer processors?
2) Can your board supply the proper voltages needed for the newer processors?
3) Does your board have the multiplier settings needed for the newer processors?

If you answered yes to all three of these questions, then there is a good chance that your board will work with the newer processors. Please use this page as a reference, then consult your board manual and website for the proper settings and BIOS updates.


Note to S1573 users: Most of the information on this page applies to the Tyan S1573 as well as the S1571. The S1573 is basically the ATX version of the S1571, so there are very few differences. However, there are definite differences in the jumper markings and settings on the S1573. Please use this page as a reference, then consult your S1573 manual for the proper jumper settings.

Attention S1590 users: There is a great website for all you would ever want to know about the Tyan S1590 at: http://members.tripod.com/GrandSearch/Tyan/index.htm.

If anyone has any new information, corrections, comments, or suggestions for this page, please feel free to email me at scotth@exit109.com. I would also like to hear from those of you who have put this information to good use and whether or not you encountered any problems.


Use the following directory to find information on getting the most out of your S1571:

Unsupported Processors - (updated 9/16/01)
Tyan bios v1.06 - New J.2 Patch! - (updated 9/16/01)
Jumper Settings
System Ram
Overclocking
Win95 K6-2/350+ Bug
Utility Programs - (updated 9/16/01)
Disclaimer






Tyan S1571 Unsupported Processors


The S1571 manual states that the Intel P55C 233, the AMD K6-233, and the Cyrix PR233 M2 processors are the highest that the board can support. There are many of us who have found that the board is very capable of handling processors well above these stated limitations. Tyan even (unofficially) posted jumper settings for the AMD K6-266 on their website in the fall of 1998. They soon after removed these settings. (I believe they just didn't want to answer a lot of tech support questions for a processor that they weren't willing to officially support).


Intel

Since the P55C 233 was the last Intel socket 7 processor (the Pentium II's are all of the slot 1 type), none of the upper end Intel processors will work in the S1571 motherboard.

Important!! The Intel Celeron processors will NOT work in the S1571. The Celeron was designed for use in a socket 370 board, NOT a socket 7 board!


Cyrix

The S1571 manual only lists Cyrix processors up to the PR233 M II. However, the upper end Cyrix M II processors will work with the S1571 motherboard.

Important! The following notes are a few things you should know about Cyrix M II processors before you decide to install one in the S1571.

First, a note concerning the "PR" numbers on Cyrix processors. These are what Cyrix calls "performance ratings" and are NOT an indication of actual processor speed! For example, the M II-333 is designed to run at a bus speed of 83mhz with a 3.0 multiplier. This gives you an internal speed of only 250mhz, not 333mhz. The following chart shows the Cyrix recommended bus and multiplier settings with the ACTUAL internal frequency shown in red:


ProcessorClock Mult.Bus Freq.Actual Freq.
M II - 266x2.583mhz 208mhz
M II - 300GPx3.075mhz225mhz
M II - 300GPx3.566mhz233mhz
M II - 333GPx3.083mhz250mhz
M II - 366GPx2.5100mhz250mhz


The third multiplier pin, BF2 (Cyrix calls it CLKMUL2), is NOT functional on the M II processors. This means that the highest multiplier you can get with these processors is x3.5. If you look at the Jumper Settings section on this page, you will notice that the x4 through x5.5 multiplier settings ALL use the BF2 pin.

All Cyrix M II processors use a core voltage of 2.9v and an IO voltage of 3.3v.


AMD

Many of the upper end AMD processors will work perfectly with the S1571 motherboard. This includes ALL of the K6 and many of the K6-2 models.

AMD K6
AMD K6-2 (up to 333mhz)
AMD K6-2 (350mhz and above) - (updated 9/16/01)
AMD K6-III - (updated 9/16/01)
AMD Mobile K6-2+/K6-III+ and "E" processors - (updated 9/16/01)


AMD K6

All of the AMD K6 processors will work with S1571. The v1.03 bios that comes with the S1571 supports the K6, but may not properly recognize the the models above 233mhz. For the rest, simply set the bus speed, CPU multiplier, IO voltage, and core voltage to the proper settings. All of the AMD K6 processors use a 66mhz bus speed and an IO voltage of 3.3v. However, the core voltages differ between different models. This should be clearly marked on the top of the CPU. If not, here's a list of the K6 processor core voltages:

Model 6 processors:
AMD-K6-166ALR -- 2.9v core
AMD-K6-200ALR -- 2.9v core
AMD-K6-233ANR -- 3.2v core

Model 7 processors:
AMD-K6/200AFR -- 2.2v core
AMD-K6/233AFR -- 2.2v core
AMD-K6/266AFR -- 2.2v core
AMD-K6/300AFR -- 2.2v core

Note the use of the ' - ' between the "K6" and the "233" with the model 6 and the use of the ' / ' with the model 7. The "F" in "AFR" denotes a 2.2V core.

Point of interest: The model 6 uses .35 micron process technology and the model 7 uses .25 micron. This allows for the lower core voltage in the model 7.
-- Return to the AMD section --



AMD K6-2 (up to 333mhz)

Even though they are designed for the "super" socket 7, most of the AMD K6-2 processors will work with the S1571. The only important differences between the socket 7 (what the S1571 uses) and the "super" socket 7 is support for a 100mhz FSB (front side bus) and AGP. Since the S1571 doesn't even have the hardware for either of these, it doesn't matter. There are no other limitations with using a K6-2 in a socket 7 motherboard. I'm using a K6-2/333 in my S1571 right now and it's working great!

The v1.03 bios that comes with the S1571 does NOT support the K6-2, so you will need to upgrade your bios to the v1.06 bios available for download from Tyan. The v1.06 bios not only allows your system to properly recognize the K6-2 (the v1.03 bios labeled my K6-2/333 as a 486 at 66mhz), but it also allows for support of some of the advanced features of the K6-2. All you need to do, besides updating your bios, is to set the bus speed, CPU multiplier, IO voltage, and core voltage to the proper settings.

Important!! ALL of the AMD K6-2 processors use a 66mhz bus speed when used in the Tyan S1571. This includes the 95 and 100mhz bus models! (See the section on overclocking for more information on faster bus speeds.)
-- Return to the AMD section --



AMD K6-2 (350mhz and above)

The information presented in the above AMD K6-2 (up to 333mhz) section also applies to most of the K6-2/350 and higher processors. However, there are some differences and possible problems that need to be mentioned.

First, any AMD K6-2/350 or higher system that is running Windows 95 WILL become unstable. I explain this problem in full detail in the Win95 K6-2/350 Bug section of this web page.

Note: You will need to enable the "Write Allocate" feature on certain versions of the K6-2 processor. The updated v1.06 bios enables the Write Allocate feature on the K6-2 model 8/[7:0], but doesn't seem to enable it on the K6-2 model 8/[F:8] (CXT core), which includes the K6-2/400. Although the system will run fine without this option enabled, it will not perform as well as it should. The Write Allocate feature can be enabled on the K6-2 model 8/[F:8] by using either the "Setk6" program or updating to the J.2 patched bios. I have made both of these files available for download in the utility programs area of this page.

In the following paragraphs, I will list each AMD K6-2 processor at 350mhz and above separately and address any problems related to each.

K6-2/350 and 380
The problem with using these processors on the S1571 is that you can't actually run these speeds. For example, the K6-2/350 was designed to work on a motherboard with a 100mhz Front Side Bus. The speed of 350mhz is easily reached by multiplying the 100mhz bus by x3.5. Unfortunately, there is no way to actually get a speed of 350mhz on the S1571. You would have to either take a loss in speed and settle for 333mhz (66 x 5), in which case you might as well buy a 333mhz model, or try to overclock it to 366mhz (66 x 5.5) and hope for the best.

K6-2/366
This processor works fine on the S1571. Just remember to set the multiplier to x5.5 (66 x 5.5 = 366). Also, you may need to enable the Write Allocate feature of the cpu (see "Note:" above).

K6-2/400
AMD decided to re-map the x2 multiplier to x6 in the K6-2 model 8/[F:8] (CXT core) and above. This allows for a processor speed of 400mhz on 66mhz bus systems (66 x 6 = 400). So, the K6-2/400 works fine in the S1571. However, you will need to enable the Write Allocate feature of the cpu (see "Note:" above).

K6-2/450 and above
The only way to get a speed of 450mhz on the S1571 would be to overclock the bus to 75mhz and setting the multiplier to x6. Unfortunately, running the bus at 75mhz brings in a lot of other problems and I do NOT recommend it (see the Overclocking section elsewhere on this page).

The 450mhz and above AMD processors will work fine on the S1571 if you simply "underclock" them. I am running a K6-2/500 set at 400mhz (66mhz bus with an x6 multiplier) on my S1571 server and it is working great.
-- Return to the AMD section --



AMD K6-III

The information presented in the above AMD K6-2 (up to 333mhz) and the AMD K6-2 (350mhz and above) sections also applies to the K6-III/400 and higher processors. However, there are some differences that need to be mentioned.

The AMD K6-III processor will work fine on the Tyan S1571 motherboard with a few setting changes and one minor drawback. Unfortunately, the same processor speed limitations that apply to the K6-2 also apply to the K6-III. So, the best processor that can currently be used with the S1571 is the K6-III/400.

First, you will need to upgrade your bios to the v1.06 bios available for download from Tyan. As with the K6-2/400, AMD re-mapped the x2 multiplier to x6 in the K6-III allowing for a processor speed of 400mhz on 66mhz bus systems.

Setting Changes
There are some system setting changes that you will need to make before the K6-III will work properly on the S1571. First, you will need to disable the "System BIOS Cacheable" option in the system BIOS. For some reason, the motherboard won't even boot unless this option is disabled. Second, you will want to enable the "Write Allocate" feature of the cpu. The updated v1.06 bios enables the Write Allocate feature on the K6-2 model 8/[7:0], but doesn't seem to enable it on the K6-2 model 8/[F:8] or the K6-III. Although the system will run fine without this option enabled, it will not perform as well as it should. The Write Allocate feature can be enabled on the K6-2 model 8/[F:8] by using either the "Setk6" program or updating to the J.2 patched bios. I have made both of these files available for download in the utility programs area of this page.

The Drawback
There is one minor drawback when using the K6-III with the S1571. The advanced "Write Combining" feature of the cpu doesn't seem to work properly. In fact, enabling this feature usually causes Windows to simply "lock-up" during start up. However, this feature results in only a small gain in performance, so it's no great loss.
-- Return to the AMD section --



AMD Mobile K6-2+/K6-III+ and "E" processors

The mobile K6-2+/K6-III+ processors have a lower core voltage that allows them to run cooler and more efficiently in laptop/notebook systems. Even though the core voltage is lower than the 2.0v capabilities of the S1571, they can still be used on this motherboard. However, you will need the new J.2 patched bios to support these processors (see the "BIOS" section of this page).

The "E" processors are "Embedded" processors. These were designed for industrial and other special applications. These may not work on the S1571. So far, I only know of 1 person who has tried the embedded processor on the S1571. The processor did NOT work on their S1571 system. If anyone has succesfully used an embedded processor on the S1571, please email me at scotth@exit109.com with any information that might be helpful.
-- Return to the AMD section --



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NEW! Tyan S1571 bios v1.06 with J.2 Patch NEW!


Jan Steunebrink has released a patched version of the Tyan bios v1.06 for the S1571 motherboard. I have tested this bios and it works great. Many thanks to Jan! You can visit his webpage at http://web.inter.nl.net/hcc/J.Steunebrink/ .

Features:
Support for the AMD K6-2 and K6-III Write Allocate feature
Support for the AMD K6-2+ and K6-III+ processors

(Note! The SetK6 program is no longer needed with this bios)

You can download this new bios directly from the utility programs area of this page.

You can download the original v1.06 bios directly from Tyan's S1571 BIOS Support page .

Important! If you get the error message while flashing that says "The program file's part # does not match with your system! Program anyway?", tell it yes. Also, you MUST clear your cmos after flashing your bios! You need to use JP22 on the motherboard right above the battery. Try not to confuse this with J22, which is next to the bios chip. The reference to JP1 on pg. 47 of the S1571 manual is a mistake. In fact, it looks like they copied that page from another manual. If you look at the diagram on pg. 47, you'll notice that it's for a motherboard that uses the VX or HX chipset. The S1571 uses the TX chipset.

Note: Windows 95 (and possibly 98) will most likely update itself after upgrading the bios from v1.03 to v1.06. Windows will simply go through the "Found New Hardware" process the first time you run it after the update. This is normal due to the added hardware support of the newer bios.


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Tyan S1571 Jumper Settings
CPU Multiplier Settings
 BF0BF1BF2
x1.5OFFOFFOFF
x2ONOFFOFF
x2.5ONONOFF
x3OFFONOFF
x3.5OFFOFFOFF
x4ONOFFON
x4.5ONONON
x5OFFONON
x5.5OFFOFFON
x6*ONOFFOFF
NOTES:

1) The CPU multiplier is calculated by simply
multiplying the bus speed by the multiplier.
For example, an AMD K6/266 would use an x4
multiplier (66.667 x 4 = 266mhz).

2) These settings will work for most processors.
However, If you are using an AMD K6/233, or
any Cyrix M II, these settings will NOT work for
overclocking. All 3 pins (BF0, BF1, and BF2)
are on these processors, but the BF2 pin is
disabled.

*The x6 multiplier applies only to the K6-2
model 8/[F:8] (CXT core) and the K6-III.
This does include the K6-2/400.

CPU IO Voltage Setting (something Tyan left out of the manual.)
 VIO
3.5vOFF
3.3vON
Note to S1573 users: The VIO setting on the S1573 is set with jumpers JP24, JP25, and JP26. However, the manual states that JP26 may not be present on some boards. These 3 jumpers need to be ON for a 3.3v IO, and OFF for a 3.5v IO.


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Tyan S1571 System Ram


The Tyan S1571 motherboard seems to be REAL sensitive to the brand of system ram installed. Certain brands will cause problems such as lock-ups, ram errors, spontaneous reboots, etc. However, the most common problem seems to be improper recognition during boot-up. A 32mb DIMM will show as 16mb, and 64mb will show as 32mb. This usually happens to the DIMM plugged into SDRAM bank 0. So, I highly recommend using ram from the Tyan approved ram list.

Even though PC100 and PC133 DIMMs are designed to work on faster bus boards, I have used them in the S1571 with complete success. I thought it was important to mention this since the faster ram types are actually less expensive these days then PC66 ram. Just make sure the ram is of the 3.3v unbuffered variety. For the most part, any good quality SDRAM or 60ns EDO ram from Tyan's approved ram list should work fine.

I would not recommend running any more than 64mb of ram in the S1571. As Tyan points out on pg. 15 of the manual, the Intel TX chipset can only cache up to 64mb of ram. This means that any ram above 64mb will NOT be cached, and believe me, uncached ram can be very slow. Once your system starts to access any ram above the 64mb mark (which happens often in Win95/98), you will start to see some SEVERE system lags. I've found that the added benefits of the extra ram do NOT justify the extreme loss in performance. But, this is just my opinion derived from past experience... it's up to you.


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Overclocking on the S1571


First, I need to say that I really don't recommend overclocking. It can cause damage to both the hardware and software on your system and reduces the life of your processor by one third! Overclock at your own risk!

One of the main problems with overclocking is excess heat. If you are going to overclock your system, make sure you use a proper amount of silicone heatsink compound (also called heatsink grease) between the top of the processor and the heatsink. You can find heatsink compound at your local Radio Shack store. If your heatsink has one of those grey silicone pads stuck to it, throw it out and use heatsink compound. These silicone pads are pretty much worthless for properly transferring heat between the processor and the heatsink.

There are two ways that you can overclock your system. One is by increasing the bus speed, and the other is by changing the CPU multiplier to a higher setting.


Overclocking by increasing the bus speed

This is the most dangerous way to overclock your system. I strongly urge you not to try it. Here's the problem: when you increase the bus speed, everything speeds up. This includes the PCI bus, ram access, etc. This may sound like a good idea, but you have to be REAL careful. The PCI bus specifications state that the PCI bus is supposed to be ran at 33mhz. So, PCI card companies design their products to run at 33mhz. This includes video cards, etc., AND the PCI IDE hard drive controllers built-in on the motherboard. On the S1571 the PCI bus speed is determined by dividing the bus frequency by 2. So, at 66mhz, the PCI bus will run at the proper 33mhz. If you try to run the bus at 83mhz, the PCI bus would then be running at 41.5mhz! You would have a hard time getting the system to even boot-up at this speed. Even a 75mhz bus setting will cause problems. First, your video card would most likely lock up. Then, you could start getting memory read errors and file corruptions on your hard drive. One other problem is that your chipset, ram, and PCI cards will ALL run much hotter. This is because they are running at a faster speed. I've known people who have fried their chipsets and video cards by overclocking this way. Most motherboards designed with the 100mhz front side bus set the PCI bus at a fixed 33mhz, so they work fine at the faster bus speeds. However, the S1571 isn't designed that way. Sometimes increasing the amount of ram wait states and lowering the PIO and/or UDMA mode for your hard drives in the bios will help, but not always.

Note for those using faster processors: There seems to be a new problem when you try to combine the increased speed of a new processor with the already increased speed of an overclocked bus. The errors usually come from increased "access" speeds to the ram, the on-board (L2) cache, the chipset, and the PCI bus. The increased access speeds obtained from running the bus at 75mhz are sometimes within tolerable limits with a slower processor. However, once you add the increased speed of a faster processor to the already increased bus speed, the access timings get to be too much for the system to handle. I learned this myself the hard way. I was able to run the bus at 75mhz with my K6-233, overclocking it to 266mhz. However, once I upgraded to the K6-2/333, I could no longer get away with the 75mhz bus speed. I started getting ram errors, random re-starts, disk errors, etc. Many people have emailed me who have found the same to be true on their systems. So, increasing the bus speed almost never works with a faster processor... at least not on the Tyan S1571.

Overclocking by changing the CPU multiplier

This is by far the safest way to overclock your system. Setting the CPU multiplier to a higher setting only changes the speed of the processor, so the bus speed is left at the proper 66mhz setting. I've been running my AMD K6-2/333 at 366mhz this way without trouble. The most common problems to watch out for with this method are random system lock-ups, unexpected program crashes, and other odd system behavior.

Note: Trying to overclock the AMD K6/233 processor (and lower) by changing the CPU multiplier to a higher setting will NOT work. All 3 pins (BF0, BF1, and BF2)are on the K6/233, but BF2 is either internally pulled high, or disabled in some way. I found this out the hard way with my own K6/233 and in some obscure little side note in the AMD K6 documentation. This might have been their way of preventing overclocking.


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Windows 95 and AMD K6-2/350+ Bug


Using an AMD K6-2 (and possibly a K6-III) processor at 350mhz or above brings out a bug in Windows 95. Microsoft describes it as "a software timing loop that is sensitive to processor frequency". Even though Microsoft has developed a fix that only works with Windows 95B (OSR2), I have found that this bug also affects the original version of Windows 95 and Windows 95A. When you are starting Windows 95 on a system with an AMD K6-2 processor running at speeds of 350 MHz and above, you may receive one of the following error messages: "Device IOS failed to initialize. Windows Protection Error. You must reboot your computer." OR "Windows Protection Error. You must reboot your computer."

If you're running Windows 95B (OSR2), all you need to do is download the amdk6upd.exe patch from Microsoft.

Important! The above patch will NOT work with the original version of Windows 95 or Windows 95A. In fact, installing the above patch in any version of Windows 95 other than OSR2 can cause SERIOUS problems.

If you're running either the original version of Windows 95 or Windows 95A, you will need to check two files in your \Windows\System\Iosubsys directory. These two files are "Esdi_506.pdr" and "Scsiport.pdr". Check the properties of these two files. If the version numbers are anything other than "4.00.1112", then you need to change them. I have made these two files available in the utility programs area of this page. Simply make back-up copies of the original files (just in case), then copy the two new files into your \Windows\System\Iosubsys directory.


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Utility Programs


NEW!
73JSP106.ZIP
- File size: 107k

Tyan Titan S1571/S1573 motherboard BIOS V1.06 with patch J.2 for
AMD K6-2+ and K6-III+ support. 07/02/2001 by Jan Steunebrink

Support for the AMD K6-2 and K6-III Write Allocate feature
Support for the AMD K6-2+ and K6-III+ processors

(Note! The SetK6 program is no longer needed with this bios)


TYAN_OPT.ZIP - File size: 7k

Tyan S157x BIOS Optimizer. FREEWARE VERSION 1.1 - 75/83MHz support.
Coded by Yuval Melamed Rehovot, ISRAEL 1998(c).

Features:
SPL - Enable Speculative Leadoff.
RC2T - RAS# to CAS# delay of 2T.
CL2T - CAS# Latency of 2T.
SD347 - SDRAM timings of 3T/4T/7T.
EXS - Enable PCI Extended Signaling.
CPR - Enable high CPU priority.
L2MB - Enable L2 Cache Modify Bit.
USB - Do not assign IRQ for USB.


W95A-K62.ZIP - File size: 23k

W95a-k62.zip contains the two files needed to fix the Win95 K6-2/350 bug in the original version of Windows 95 or Windows 95A. The two files are:

Esdi_506.pdr (version 4.00.1112)

Scsiport.pdr (version 4.00.1112)


SETK6V2.ZIP - File size: 169k

AMD K6, K6/2, K6/2CXT [K6/III]-Utility SetK6, c't, Andreas Stiller

SetK6 controls and sets the internal processor registers for Write Allocation and Write Combining.

Note: There is a newer version of Setk6 available (Setk6v3), but it crashes on my S1571. I will offer it here for download only after the author has worked out the bugs.


More programs to come...


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Disclaimer


I, Scott Holland, am not and will not be held responsible for any damage that may occur, hardware or otherwise, from the use or misuse of this information. Also, I am in no way affiliated with Tyan or any related companies and/or holdings.


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