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The GeForce 8800 GTS is the little brother of the 8800 GTX, with both being based on the same Nvidia next-generation DirectX 10 GPU. The 8800 GTS is slightly crippled compared to the GTX, but it will still beat powerhouse cards like the dual-GPU 7950 GX2 in many cases. The biggest downside to the 8800 GTS 640MB is that its cheaper 320MB cousin offers very close performance for much less scratch. However, if you plan to play your games at high resolutions - 1600x1200 or above - it's worth the extra money to get the 640MB version.