Today TweakTown compare three of the latest nVidia based AGP and PCI Express graphics cards from Gigabyte. We look at the GeForce 6200 for the low-end market, the impressive value for money GeForce 6600GT with SLI support along with the high-end 6800GT AGP which offers great performance but not at the price of the very high-end models. Read on and work out which graphics card is best for your needs as we run them through our usual array of gaming benchmarks