Both cards were benched on the same test computer with the same drivers (Catalyst 8.4).
Test Computer Specifications
Processor: Intel Core 2 Duo E8400 3GHz
Motherboard: Asus Rampage Formula
Memory: Crucial Ballistix Tracer DDR2 800 @ 4-4-4-12 (Sponsored by Crucial)
Power Supply: Thermaltake Toughpower 1000 (Sponsored by Thermaltake)
Operating System: Windows Vista Ultimate x64 (Sponsored by Microsoft)
Package Contents: AX4850 512MD3-H, Driver Disk, User's Manual, HDTV Cable, DVI to VGA/D-sub Adapter, DVI to HDMI Adapter, CrossFire Bridge, S-Video to Composite Adapter
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