A friend and I built the comp about 6 years ago, 4mo ago the gfx card died and I replaced it with a Gigabyte GEFORCE GTX 650ti and then lag problems began occuring. Most noticible while playing WoW, but can also see whne simply browsing around on comp. Replaced internal power supply with ANTEC25 650 and still having the issue. if anyone could please help I would appreciate any input.