Hi guys. I want to buy an ATI HD4870 instaed of my GTX9800. Here are my questions: 1. How does 1GB is better then 512MB on the GPU? (higher resolution?) I work @ 1600x1200 (20 inch). 2. There's the Sepphire Toxic 512MB edition, is it better then 1GB since it's OC'ed and has better cooling? My RIG: Intel E8500 C2D 2x2GB Corsair 4 4 4 12 Gigabyte EX38-DS4 Thermaltek 750W Zalman 9500CNP Vista 64. Thanks. Gil.