ATI Crossfire

Hi Guys my problem is ati crossfire
My system is as follows.
CPU is a Intel Q6600 clocked 2.9GHZ
Gigabyte Motherboard GA 48X DS4
Gigabyte 2 x ATI 4770
2 x 2gig Kingston ram
600watt PSU
On the 3dMark06 with 1 card I score 13000 points
with Crossfire anabled (2 cards) I score 16000 thats only 24% improvement.
On the write ups there say 80%.
I know they are using i7 Intel with 58 chipsets Is this the problem
Regards
Acelightning

If you are running the default test at 1280x1024 then you are probably running into a CPU limitation.
3D Mark 06 uses the CPU performance as part of its calculation for the final score as well, which can skew the results.
As an example my setup (before killing the HD4870) only scored 12000 on default yet could play even Crysis at 1920x1200 all high DX9!
Try retesting with 3D Mark Vantage and comparing with the scores in Toms article on 4770 in Crossfire.
And listen to Maziar: Games are more importaint than synthetic benchmarks

Coozie's nailed it. At the default resolution for 3DMark06, you GPU's are being bottlenecked by your CPU. I ran into the same thing with my 295 GTX. Again as Coozie pointed out, use actual games to see the benefit of your CrossFire setup. Crysis, or my personal favorite Far Cry 2 are pretty good at highlighting GPU power. I like Far Cry 2 because you get a pretty graph along with your MIN, MAX, AVG fps.