"One more pitfall for the AMD platform in this test session was PCI Express. The Gigabyte GA-MA790GP-DS4H mainboard is based on the AMD 790GX chipset which supports two ATI Radeon cards in CrossFireX only as PCIe x16 + PCIe x8"

It's x8+x8 in CF and not x16+x8.

They should have used a high end 790FX AM3 board for this test and not a AM2+ mainstream mobo.

i7 - X58 + DDR3 + x16+x16

C2D - X48 + DDR3 + x16+x16

PHII - 790GX + DDR2 + x8+x8