AMD quad core people, is a windows bug throttling your CPU?

Phonix · **Posted:** Sun Apr 03, 2011 7:41 pm

Quote:

Anyone using a newer model of AMD phenom X4, especially if you are using a phenom II, on vista/win 7 read this:

on very old phenom cpu's there was a problem known as the TLB BUG.

there was a windows update patch put out to fix it,

the problem is, windows 7 and vista are now mistakenly applying this "fix" to PHENOM CPU'S THAT DON'T HAVE THE PROBLEM, severely limiting cpu performance!!!!

anyone with framerate drops with phenom cpu , first make sure your CPU is NOT affected by TLB bug(most newer ones are not), then read this thread (and note- even if your bios allows TLB bug fix to be disabled, windows may re-activate it!):

http://www.overclock.net/amd-cpus/48392 ... sable.html

there is a link to this tool in the thread, which allows you to disable TLB bugfix in vista/win7:

http://www.overclock.net/attachments/am ... e-tool.zip

extract the files, then
run TLB_disable.exe *as administrator* and enjoy your new CPU without framerate drops!!!!

if you want to read more about this, here is another thread:

http://www.hardwarecanucks.com/forum/o- ... henom.html

and i quote:
"After the 16th reworking of Google keywords, by fluke I happened upon a discussion between AMD enthusiast who had deduced a rather startling fact – Microsoft, in their infinite wisdom and without informing users, had chosen with Vista SP1, to arbitrarily over ride user’s BIOS settings in regards to the TLB fix. Manually disabled or not, SP1 WILL set the TLB fix to enabled on your system dramatically hurting performance. This is also true of the AOD (AMD OverDrive) utility, even when set to disabled (yellow ring), the TLB fix setting is forced to enabled by SP1 code." -- this also applies to win 7

btw, the file has to be run every time you reboot, but you can use "task scheduler" to have it autostart on boot

this fix applies to all games of course -- while you may not see a massive boost in maximum framerate, it should greatly improve minimum framerate, giving you less framerate drops -- (I've seen massive improvements in minimum FPS in TF2, BFBC2, LOTRO) , not just black ops -- you can easily try the fix and then simply reboot and the fix will be gone until you run tlb_disable.exe again. For example: in unigine heaven 2.1 , my minimum fps without this fix is 3.1, with the fix is 14.0.

my system: AMD Phenom II X4 945, Radeon 6870 1 gig, 6 gb ram, Windows 7

Taken from guru3d.com and quickly circulating around the web, many people are reporting success with this patch.

CMDR Steve-O · **Posted:** Mon Apr 04, 2011 6:33 am

I turned on "TLB" and it totally wanked my framerate, and then I turned it off and it went normally after that.

Interesting though...

deandulong · **Posted:** Tue Apr 05, 2011 6:07 am

Ya i dont think our 890 boards have that prob with TLB its turned off and stays off

Phonix · **Posted:** Tue Apr 05, 2011 12:19 pm

The problem isn't your chipset or motherboard, they're fine. Windows overrides their settings by default with it's own TLB bug fix on all Phenom 1 and 2 Quad Cores, even though this bug only affects Phenom 1's.

I disabled it and saw no noticeable difference in framerate in most of the games I tried. Maybe 2-5 fps.

Either way, like Steve-O said it's still very interesting.

The more I read into it, it seems almost evil, as if Intel had a part in this but I'm not going to speculate.

Hali_Newf · **Posted:** Tue Apr 05, 2011 1:22 pm

would this effect a bench?

CMDR Steve-O · **Posted:** Tue Apr 05, 2011 1:38 pm

This would effect everything on the computer. It's just more easily shown on games since you can tell the difference between 10fps and 2fps.

...start a game, "ooh looky pixels", alt+tab out, enable TLB, go back into the game...

"ACHHHH, my eyes! they burn...make it stop!"

alt+tab out, disable TLB, go back into the game...

"ahhhh much better."

AMD quad core people, is a windows bug throttling your CPU?

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