Cant get 6870s in Xfire to OC at all

[brentonius]

So ive started trying to OC my video cards in crossfire (MSI 6870x2). I don't want a huge OC on them, i just want to see if it will get me more FPS while playing battlefield 3. GPU usage on both cards sits at like 85-98% the whole time im playing (on ultra). i get about 60 fps when theres not a lot going on in big maps, but once things start blowing up around me i get some drops. would mem clock or core clock help more with getting fps?

so no matter what i change when im overclocking in msi afterburner my computer freezes up as soon as i try to play games, or run furmark or 3dmark11.

i tried upping memory clock from 1050 to 1070 and it froze. so i tried to up the voltage a little and it didnt help.
so then i reset the settings and tried to up core clock from 900 to 920 and same thing, extra voltage didnt help either.
so im really lost on what i can do, if anything to get these overclocked a little.

i dont think temperature is an issue GPU 1 is at 54C idle and like 70 when in bf3. GPU 2 is at 36C idle and gets to about 60C in bf3 i think. i have a 200mm (166cfm) fan blowing right onto the side of the gpu's to help keep them cool.

i read earlier that increasing NB voltage or PCI-E frequency in the BIOS can help but ive never heard that before so i dont wanna try that yet.

the cards are at 1193mV, 900mhz core, 1050mhz mem clocks stock.

the rig im using is down here

 

[OnDborder]

Try to disable "enableULPS" in the registry.
What I do is go into the registry and "find" enableulps.
There will be multiple folders with "enableUlps" under the one.
Find the enableulps strings and change the "1" to "0".


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[brentonius]

so i disabled the one that says enableulps in each of my folders that had it... but the line below the one i disabled says "enableulps_NA" should i disable that too?

 

[OnDborder]

Not necessary but it shouldn't do any harm. I think it sets back to default after reboot anyway.

 

[brentonius]

that seems to have fixed it, thanks!

went up from 900/1050 (core/mem clock) to 950/1100 without any problems

i hope its a noticeable difference ingame.

 

[OnDborder]

Awesome. Have fun.