hi my pc config is like this: P4 2.8 Ghz HT, Intel 865GBF motherboard, with agp 8x slot. It has 768MB DDR. currently i hv MSI GEFORCE 5600 FX 256 MB ddr agp card. but now i want to upgrade it to Ge Force 620/6600. Please help me to choose one. My budget is around Rs 8000-Rs 10000. Plz help.......as i am not able to enjoy the game FEAR, SPLINTER CELL:CHAOS THEORY etc.. and as i am living in MUMBAI, so can you plz lemme know(if possible) where can i buy the cards or get the cards ??