TrustedReviews has posted a comparison review between ATI HyperMemory and nVidia TurboCache

What they’re not is powerful, with quite modest specs. The TurboCache is clocked at 350MHz for both the core and the memory, coupled with four pixel pipelines and three vertex shaders. The ATI specs are slightly lower at 325/300, with four pixel pipelines and two vertex shaders. The nVidia’s specs look better on paper, but, as Alan Hanson would say, games aren’t played on paper.

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