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Overclocking in crossfire

post #1 of 20
Thread Starter 
My bro and I have been debating for awhile now, the debate is whether overclocking in crossfire nets the same performance increase as overclocking with a single card. He believes that you only benefit from overclocking both cards if you are running SLI. I really want to prove him wrong but I have no AMD cards in crossfire and there are no review sites that test this. So I'm wondering if you guys could help me out. What I need is this.

Single card:
Stock clock
Bench results
Max OC
Bench Results

Crossfire-
Stock clocks
Bench Results
Max OC
Bench results

Thank you for anyone who is willing to help. :]
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post #2 of 20
*edit* seems I somehow completely misread the op. If you only overclock one card in a CrossfireX set up and leave the other card at stock then both cards will effectively only run at the lower clock speed.
Edited by fashric - 7/22/11 at 6:56am
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post #3 of 20
If I remember correctly cards in SLI will always run with identical clock speeds. So if one card is overclocked and the other is not the the faster card will be down clocked to mach the slower. If you over clock a SLI setup you need to overclock both cards to the same speed.
    
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post #4 of 20
that was my understand too, an sli/crossfire set up can only run as fast as its slowest card
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post #5 of 20
Well that is not entirely accurate as CF can run wit a faster and slower card and not limit the speed of the faster card. How well this works in the real world I don't know.
    
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post #6 of 20
Thread Starter 
I know that in crossfire/SLI that the fastest card slows down to the slowest card. What I'm uncertain of is the scaling of overclocked performance in crossfire vs SLI. My bro thinks that overclocking performance in crossfire is poor versus overclocked performance in SLI. I want definitive proof to show him that he is wrong.

IE
5850 at 900mhz gets a 25% performance boost
2x 5850's in CF at 900mhz still gets that 25% performance boost versus say a GTX 460 in SLI once overclocked.
Edited by Tyrant1337 - 7/22/11 at 8:18am
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post #7 of 20
even if there was a difference, i doubt it would be tangible. I think the results of a difference if any would be considered in the margin of error when running benches
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post #8 of 20
If nobody else has done it I will do it in a couple of hours in the DiRT 3 benchmark.
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post #9 of 20
Thread Starter 
Quote:
Originally Posted by fashric View Post
If nobody else has done it I will do it in a couple of hours in the DiRT 3 benchmark.
Alright, sweet, it'd be awesome if you were to do it, since I'm currently looking for someone on the Nvidia board to do OC'ing benchies with 2x GTX 460's.
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post #10 of 20
While I was overclocking my crossfire setup using heaven benchmark, I observed that every 100mhz increased net me about 10 - 15 FPS. Do not know if that will be any help.
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