"Previously, in our April review of the XFX 8600 GT XXX, the 8600 GT was shown to be a solid upgrade choice for someone with an aging, under-performing GPU. Benchmarks indicated that the XFX 8600 GT XXX vastly outperformed 6600 GT class cards, while offering only slight performance gains over 7600 GT cards. However, if you consider that the 8600's all utilize the new unified shader model, and with PureVideo HD (for optimized Blu-Ray and HD DVD playback), as having Coverage Sampling Antialiasing technology (which reduces the processing strain of AA on your GPU), then going the 8600 GT/GTS route makes a lot of sense. Especially when you can find 8600 GT's retailing for only 10 or 20 dollars more than the 7600 GT's."
Check it out at Neoseeker.