Hello, I recently picked up a second Sapphire HD5770 and am running it in crossfire. When I check the ATI Overdrive section it states my second card's GPU Clock @ 399mhz - half the speed of the supposed clock.
I loaded CPU-z and it reports the same clock speeds.
I am running an ASUS p5Q-E motherboard - so both cards are capped @ 8x PCI - but from what i've read that makes a 2-5% difference from the 16x slots.
My 3dMark Vantage Score is around 12-13 for GPU score.
8GB OCZ DDR2 Ram ASUS p5Q-E MB / Q9300 Yorkfield 2 x Sapphire HD5770 Vapor-X Crossfired 850W Antec TruePower Quattro PS
What gives with the low(er) GPU score and odd GPU core readouts?
More abouthd5770 crossfire
if your cpu isn't overclock then it's most likely bottlenecking the cards, OC to 3+ ghz and re run the tests
I overclocked my CPU to 3.19 ghz, the GPU score didn't change at all. Today I returned both cards in exchange for an HD5870, going to re run the tests to see the score now.