So right now I have one 8800 ultra and one of my friends has a 4870 x2 he is willing to sell me for $100 dollars plus the ultra I use a 1920 x 1200 res screen and I use vista 64 and xp 32bit with a Intel i7 920 will I see big enough performance gains to justify the $100 dollars and ULTRA for the card? I have a big enough power supply to power it and all that i just want to know possible performance gains as I haven't found many good benchmarks comparing the 2 cards.