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overclock drops performance

post #1 of 6
Thread Starter 
Last night I started to overclock both my GPU in xfire mode to see how much performance gain I get. I used Heaven benckmark 2.1 to check the performance difference. At 900/1375 I get average 103 FPS with a score of 2595 (tesselation normal, shaders high, aa off, anisotropic 4x - basically default setting). I kicked it up to 900/1400, my performance dropped marginally to 101.7 FPS and a score of 2588. I did not think I was getting too high up in clocks to see actually performance drop....this is boggling my mind a bit. It is hardly much of a drop, but from a theoritical stand point it is still a drop. I kept it at 900/1375 for now. But was wondering if there are any wise comments on this.
EDIT: Well, I tried this morning and now I am getting a bit more higher score. So, discard this topic for now.
Edited by Awaz - 3/1/11 at 8:09am
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post #2 of 6
You've maxed out your card and are artifacting before the frame hits the screen. AMD cards since 58xx re-render artifacted frames before displaying them. If you clock too high you'll hit a point where your card spends more time re-rendering bad frames versus new frames, hence the speed drop. Overclock until you see a speed drop then back off a lil bit.
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post #3 of 6
Quote:
Originally Posted by tsm106 View Post
You've maxed out your card and are artifacting before the frame hits the screen. AMD cards since 58xx re-render artifacted frames before displaying them. If you clock too high you'll hit a point where your card spends more time re-rendering bad frames versus new frames, hence the speed drop. Overclock until you see a speed drop then back off a lil bit.
Sounds about right... you have reached the threshold whereby your card cannot go any faster than it is currently going, and as such, trying to go faster is actually slowing it down, because it simply is not able to go the speed in which you are trying to squeeze out of it.
     
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post #4 of 6
Thread Starter 
Yep. I think I am sticking to 900/1375 for now I think. Will play a few games in the coming days to check out stability.
I was really staring at the screen through out the whole benchmark. I did not see any artifacts. Ran OCCT for a bit as well, did not see any artifacts. OCCT for some reason will not kick the core clock beyond 600 - 700. Maybe I will try Kombustor.
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post #5 of 6
Yer not supposed to be able to see artifacts because the algorithm is doing it's thing. If you did see artifacts it just means you went way over threshold. Your mem is probably at it's limit but your core clock could prolly go upto 950 ish.
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post #6 of 6
Thread Starter 
Well, I could not help myself 900/1400 looked sexy. So I just kept it there

I think I am going to leave it at that.
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