My performance simulation of GeForce 9800GX2

[OBR]

you forgot one thing, the 9800gx2 will have 16lanes for 2 cards, so each gpu will have 8 lanes only, so itll be even slower than that

16x lanes PCIe 2.0 has bandwidth like t16+16 PCIe 1.1! Dont forget on PCIe 2.0! On this chipset and cards!