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Crossfire - prevent downclocking?

post #1 of 14
Thread Starter 
I've just been playing around with my Tri-fire (2 5850's & 5870) and noticed that if I play a less GPU intensive game like Half Life 2, for example, 2 if not all 3 of my cards are so un-stressed that they occasionally revert to 2D clocks, i.e 157/300

This is causing what I believe to be the Crossfire scaling to get out of sync, and producing a very annoying line not too dissimilar to non-v-sync tearing about a third of the way up the screen.

I remember seeing in one release of the Catalysts an option to "disable Crossfire power saving", and I'd assume that's what I need to do to stop this happening, although I can't remember which release it was, or find an alternative in the newer drivers.

Any ideas / suggestions?
post #2 of 14
Quote:
Originally Posted by omega17 View Post
I've just been playing around with my Tri-fire (2 5850's & 5870) and noticed that if I play a less GPU intensive game like Half Life 2, for example, 2 if not all 3 of my cards are so un-stressed that they occasionally revert to 2D clocks, i.e 157/300

This is causing what I believe to be the Crossfire scaling to get out of sync, and producing a very annoying line not too dissimilar to non-v-sync tearing about a third of the way up the screen.

I remember seeing in one release of the Catalysts an option to "disable Crossfire power saving", and I'd assume that's what I need to do to stop this happening, although I can't remember which release it was, or find an alternative in the newer drivers.

Any ideas / suggestions?
MSI afterburner should have the option in settings to force constant voltage which will probably run the gpu's at full speed.
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post #3 of 14
Thread Starter 
Cheers, I did wonder if that would have any effect on clocks. I'll see how it goes...

edit.. Nope, nothing. Still downclocks. I can watch the clocks drop on my G15 display, then the tearing starts. As soon as the action kicks off, they jump back to 900/1200, and it's smooth again

I can get around it by forcing 24x Edge Detect with 2 cards, but even that isn't enough to push 3 cards
Edited by omega17 - 5/4/11 at 10:39am
post #4 of 14
Thread Starter 
Bump

Any ideas? Can't believe I'm the only one with a CF setup playing 'older' games
post #5 of 14
I just got my second 5770 and I noticed that my 2nd GPU (850MHz) only goes to 400MHz.... Bump
post #6 of 14
Quote:
Originally Posted by omega17 View Post
Bump

Any ideas? Can't believe I'm the only one with a CF setup playing 'older' games
Disable powerplay. Check the AB config where it asks you what mode you want to run during the enable unofficial overclock setting. Then set your 3d clocks then close AB.
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post #7 of 14
Did you already disable ULPS in windows registry?
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post #8 of 14
The setting to search for is "EnableUlps". The value of "1" means it is on and "0" means off. There is more than one setting so search through the entire registry. Once you are done, reboot.

I have found recently that even though I do this my clocks still drop down whereas with older CCC drivers they did not if I setup a profile in CCC and manually changed the clocks to what I wanted them to run at, now-a-days though I cannot figure out how to make all four of my GPU's run at the same speed in a 2D environment. But, changing the EnableUlps value will allow you to OC the cards in MSI AB without it crashing.
   
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post #9 of 14
Thread Starter 
I don't want to disable ULPS altogether though, I want them to return to 157/300 when I'm desktoping, and stay fixed at 900/1200 when I'm 3D gaming. Shouldn't be too hard

I'll try the registry edit though and see how it goes
post #10 of 14
If your system behaves like mine does, it should still do that. Use MSI AB to confirm though.
   
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CPU Cooler [Winter-Time] = Custom 300W ss phase... Hardware Labs Black Ice GTX 480 Radiator (4 x 1... Feser X-Changer Triple (3 x 120mm) Swiftech MCP655 (x2) 
CoolingCoolingCoolingCooling
Koolance RP-452X2 Dual 5.25" Reservoir EK MSI R9 290X Lightning - Full Cover VGA Water... EK MSI R9 290X Lightning - Full Cover VGA Water... EK MSI R9 290X Lightning - Full Cover VGA Water... 
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