well, lets look at rift then. I looked up the reqs from the publisher, they will let you play with an nvidia 7600 card. Thats really old and crappy. So IMHO your card may be capable enough to play it. You said it was getting lag and slowdown. Has this always occurred? Lets get some system specs, CPU, ram, mobo, etc. Maybe you could use some more ram or your system could be overclocked.