Hey guys I currently have a gtx 460 768mb graphics card but am going to buy an MSI GTX 660ti Power Edition. I was wondering would it be a good idea to use the 460 as a dedicated physx card? I'm planning on buying a new psu too im looking at the Seasonic G series 550w or 650w from what Ive been reading its a top notch. either that or the Silverstone strider 600w. would the 550w be enough to power them or would I need to go for the 650?