Well my mother bought a computer (packard bell) and I wan't to upgrade it. with these things: PSU:??? 115watt to PSU: Cooler Master Real Power M520 Watt CPU: Intel Pentium dual core E2140 to CPU: Intel Core 2 Duo E8400 with cooler: Arctic-Cooling Freezer 7 Pro it has an intergrated videocard- Nvidia GeForce 705 NForce 610i and I want to place on the PCIe slot a NVidia GTX260 Black edition It also hass 3 GB memory of wich 8xx mb shared and it runs vista I use it for gaming just asking if this is a good choise? if I could do something better? or something won't work?