Few days ago I have purchased a Gigabyte OC'd Radeon HD 7870. After installing it on my new build computer, I played GTA 4 for 2 hours. It seems to me that my system does not able to pass 1GB in memory without decreasing to 20 fps. Currently I have 2 GB of VRAM but I cannot use at least half of it also. The game lags hard and seeing much FPS drops. The drivers are up to date and I can play Battlefield3 without any problem and that is even with ULTRA settings hitting 70+ fps.
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