I recently bought a GeForce 7900GT, overclocked to 550:1750 Core:Memory. Anyway, I can max games like Counter-Strike: Source out, but some games just lag unnecessarily. One example would be Oblivion. Another is Quake 4, as well as Ghost Recon Advanced Warfighter. For some reason, I have to lower all of my settings down to below maxed-out. I paid $300 to NOT have this problem. What else could it be? I'm running an AMD Athlon 64 3200+ venice core 939 pin, 2.0 GB of DDR RAM, SATA 3 gb/s hard drive, A8N-SLI motherboard... I don't know what do to.