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World Exclusive: Radeon HD 2900 XT CrossFire overclocking

post #1 of 13
Thread Starter 
Quote:
We (Kinc) have been trying to get Radeon HD 2900 XT CrossFire to overclock for quite some time now. We were about to give up after trying practically everything you can imagine, but that's when AMD stepped up and saved the day. Even though the method is still very crude and far from easy to perform, we can now present the first results with an overclocked Radeon HD 2900 XT CrossFire configuration. The GPUs were overclocked to 880MHz and the memories to 950MHz, with modified memory latencies for better performance. The system setup was an Intel Core 2 Extreme QX6700 running at 3762MHz, air-cooled. The motherboard was an ASUS P5W DH Deluxe and the memories a pair of Corsair Dominators at 456MHz (3-3-3-5).

With a completely air-cooled system Kinc managed to score 20,278 points in 3DMark 06. Both the SM2.0 and SM3.0 scores are very good for such a low CPU frequency, 7,989 and 9,449 respectively. We can also tell you that CrossFire scales well, really, really well.

Don't worry, liquid nitrogen results are coming...


Source: NordicHardware
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post #2 of 13
I want to see the liquid nitrogen numbers, nice find
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post #3 of 13
modified memory latencies?? ok...

sounds like a pain in the butt to oc these cards... no thank you...
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by JoBlo69 View Post
modified memory latencies?? ok...

sounds like a pain in the butt to oc these cards... no thank you...
I was thinking the same thing

Quote:
We (Kinc) have been trying to get Radeon HD 2900 XT CrossFire to overclock for quite some time now. We were about to give up after trying practically everything you can imagine
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post #5 of 13
Bloody hell Nice!
    
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post #6 of 13
The modified memory latencies seemed to really help (as well as the overclocking)...maybe this is the issue with the HD 2900XT's? Memory latencies too high?
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post #7 of 13
dang i want
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post #8 of 13
Whats with that 3Dmark06 score picture? Looks fake to me.
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post #9 of 13
Good numbers there. Beat our top score here at OCN by 1244pts. That was a QX6700 @ 3.8Ghz with SLI'd GTX's, pretty similar system. And that without resorting to Liquid Nitrogen. Can't wait for the newer drivers that come out soon.

Oops did I say SLI'd GTXs. Yes, yes I did
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post #10 of 13
Quote:
Originally Posted by liermam View Post
Whats with that 3Dmark06 score picture? Looks fake to me.
JPEG Compression.

Does anyone know 8800GTS/GTX in SLi, air cooled on a similar system gets?
EDIT: Should of read Modki's post

I think that is pretty good performance wise for Crossfire.
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