http://www.computing.net/windows95/wwwboard/forum/9678.html

"Name: Scot
Date: July 23, 1999 at 16:26:38
Subject: AMD VXD VMM(01)+ fix

Comment:
FOr those of you that have the AMD processor, and are getting:
Fatal Exception Occured 0E at 0028:C0005338 in VXD VMM(01)+ 00004338
I spoke to AMD about 15 minutes ago. THey suggested changing the voltage on the motherboard from 2.2v to 2.3v.
I did this, and I cannot recreate the problem!!"

Outstanding!!

I had searched and searched and searched on error:

OE : 0028 : C0005338 in VXD VMM(01) 00004338

Google barely popped up anything good and I tried all kinds of search strings based on the above error. Most sites and forums including this one seemed to indicate heat-related issues with the K6-II/550 I have, but now when I searched on "Jetway 542C forum", I found this site!!

I assumed the CPU was overheating. I ripped the 5.25" metal drive bay covers and the add-in card slot covers off the case. I doubled the RAM to 256MB. I moved all the cables away from the CPU and up into the upper half of the tower. I switched nVidia cards because the 32MB in my Dell had a fan and the 64MB nVidia in the Jetway didn't. I dusted off the CPU and case fans and mainboard. I haven't seen that problem since I hooked it back up, BUT it's nice to know that someone at AMD knew about the problem and had a solution. They should have posted it prominently on their Website. If I see that error pop up again, I know how to fix it thanks to some smart people posting at Computing.net.

Scot is still a hero even in 2004!

P.S. - This is my first post here. On many occasions before when I've used Google to solve a PC problem, I've been brought to this site. However, only now have I been compelled to actually register and post. I hope Scot sees this and knows that he did good.

I've built close to a dozen systems based on the K6-2...350, 400, 450, & 500mhz CPUs & have never encountered this voltage problem...not saying it doesn't exist, just that I've never come across it. Also the K6-2 isn't known for overheating problems...in fact, I never bothered with case fans on any of the Super 7 systems I put together...cooling was accomplished with the PSU only...

I have no doubt that most other K6-II users do not encounter this problem. That's probably why I could barely find any info on it.

The only info I gathered in my previous searches was from this site:

http://www.infinisource.com/techfiles/fatal-0e-errors.html

Quote:
===========================================
AMD & Temperature

We've received information that running the (older) AMD K6-2 chips over 60ºC (140ºF) will produce a FATAL EXCEPTION OE ...0028:C0005338 IN VXD VMM(01)+00004338 (or similar) errors. So if you are running a K6-2 chip, it's another area to check!

----------------
Here's another short list of things to try:

Check to see if you have the latest drivers installed for your motherboard.
Check to see if you have the latest drivers installed for your video card.
Turn off the external cache in BIOS.
Replace RAM chips.
Reinstall the OS. Do a clean install, by formatting the drive/partition.
===========================================

I basically ran through that checklist:
1) New and increased RAM
2) Latest drivers already installed
3) Tried the external cache switch, nope.
4) Reinstallation of the OS was out of the question. Done that too many times before. I'd rather figure out how to fix specific problems.
5) Cooling improvements...BINGO

Again, since I took those small steps to try to increase cooling in my system, I have not seen the error. Before, if I was working on the PC for say more than 45 minutes, I would get this error causing a reboot+scandisk. After reboot, same error as soon as I logged in OR the PC would just simply reboot all on its own again.

The PC is in a warm environment with no A/C for over a year and the case used to be completely enclosed with the exception of the power supply fan vent and the front case fan vent. It was pretty air tight before.

The steps I took above seems to have worked, so I would conclude that the error is precipitated by heat, and the result was the CPU was operating at below 2.2 volts after running for a while in this climate. I make these guesses because there was VIRTUALLY ZERO INFO ABOUT THIS PROBLEM even with a Google search.

When I found Scot's post above, it was happy happy joy joy all over again. If I encounter the same error in the same PC, then I now know what to try. :)

I've never seen that either.

I still have an AMD K6 II 350 and two 400s that I am using.

Follow-up:

I should mention that I did find some info that seemed to indicate these types of errors MIGHT be video-related I don't think I bookmarked that site.

In this system, the CPU is very close to the AGP card. This might have caused the video card to get too warm and hence the blue screens.

I put an nVidia GeForce2 MX/MX 400 32MB with a fan on it from my Dell Dimension 8100 (which was also a replacement for the original that came with the Dell). It replaced an nVidia GeForce2 MX/MX 400 64MB with no fan. That change together with moving the drive and power cables away from the CPU fan might have done the trick for me.

As a side note, that 32MB nVidia reports that it is a 64MB card in the BIOS. It's a SCAM!! In order to achieve 64MB in Windows NT, the drivers run an app called 'rscmpt.exe' which tries to call 'runcheck.exe' which does who knows what. KerioPF4 caught that one. As long as Rscmpt.exe is running, WinNT reports 64MB for the video memory. If Rscmpt.exe is shut down, then the system reports only 32MB. Rscmpt.exe takes up takes up anywhere from 80% to 100% of the CPU at times!! In Windows Me, this process didn't run, but the system only had 32MB video RAM.

Here's more info about Rscmpt.exe: http://www.answersthatwork.com/Tasklist_pages/tasklist_r.htm

It appears that someone ripped me off by selling me a 32MB card instead of the 64MB card and forged the BIOS report on startup to claim it has 64MB.