GigabyteŽ NVIDIAŽ GeForce GTX275, 896MB 448Bit GDDR3, CUDA, PCI-E 2.0, Dual-Link DVI, HDMI, DX10/OpenGL, Triple SLI, Vista Premium
GigabyteŽ ATIŽ Radeon HD5850, 1GB 256Bit GDDR5, PCI-E 2.0, Dual DVI, HDMI & DisplayPort, DX11, OGL, Shader Model 5, Xfire, EyeFinity
I have been out of the market (actually I'm still not in the market but this is for someone else) for some time and thus my knowledge of GFX cards has dipped. What's the significance of the hardware supporting DX11 vs DX10?
If beer is not the answer, you're asking the wrong question.