I Only have a AGP Slot on a SD Rma motherboard.I Currently have a 256mb XFX 6200 Geforce Graphic card.I want to upgrade it to a 512mb XFX 6200 One but that is the latest model in 6 series available for AGP 8X in the market right now.If I Change my current Card 256 to a New 512mb XFX 6200.Will there be a boost in system performance and gaming capabilities.?WILL THERE BE DIFFERENCE IN Graphic card performance between these 2 models listed below?.1. 256mb Nvidia XFX 6200 DDR22. 512mb Nvidia XFX 6200 DDRThe 512 has a higher capacity but ONLY DDRWILL IT BE A DIFFERENCEMUST IT BE CONSIDERED?which is better for gaming and graphics on Win Vista>Or will there be no difference between the two COMPARINGLY?