The Chinese website HKEPC Hardware have thrown up some benchmarks for ATi's CrossFire vs Nvidia's SLI!

Here's the System Spec's.

AMD Athlon 64 3800+ Socket 939 Grandmars RD480 ES Sample Gigabyte K8NXP-SLi G-Skill DDR400 512MB x 2 (CL 2-2-2-5) Inno3D Geforce 6800Ultra 256MB x 2 HIS Radeon X850 XT 256MB CrossFire Ready HIS Radeon X850 XT 256MB CrossFire Edition

HKEPC Hardware