i dont want to change it i have ati radeon 4650 1gb oc and pentium g630 4 gig ram 2 hdds 1 cd room .I want to buy rx560 4gb or 2 gb or rx 460 4gb or 2gb or gtx 750ti.If my psu can handle rx 560 4gb or 2 gb if it cant get handled by psu i buy rx460 4g or 2g if this cant be handled by psu uy it but if not i buy gtx 750t