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QPI data rate slows down games

post #1 of 5
Thread Starter 
Hey everyone. As I've been doing my OC'ing I've seen lots of posts saying to turn QPI/link to the lowest possible setting (slow mode for myself). I finally did last last night while trying to get my 4.0 stable. It didn't happen so I went back to 3.8.

Well today I loaded up a few games and all were getting horrible FPS. Everything else was the same except for the QPI link speed. (I also brought vcore down 1 more notch)

I was getting 4fps in WoW and like 10 in SC:Conviction. Furmark was giving me horrible scores.

I restarted and changed it to the next option up. It was a weird number like 721Mt/s or something like that.

Everything seems much better. Maybe I should put it to the highest possible to make sure there are no bottlenecks?

Also in CPUZ it was showing QPI Link at 2400Mhz in "slow mode" and 3600Mhz now in the next setting up.

Can anyone explain this please?
Edited by xBlitzerx - 6/7/10 at 4:50pm
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post #2 of 5
Do NOT put QPI into slow mode. You will drop the QPI down to 66.66MT/s down from 5.0+ GT/s (5000MT/s). A lowered QPI will result in PCI-e bottlenecking, thus explaining your horrible FPS. Always leave the QPI multiplier at the lowest setting apart from slow mode.
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post #3 of 5
Thread Starter 
Thanks for the explanation.
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post #4 of 5
np!
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post #5 of 5
So given a choice on my MSI P55A-G55, I have 16x or 18x - I should manually set it to 18x even at stock? Right now it's at "Auto".
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