I tried using the latest linpack before installing SP1 and the gflops were the same. IBT will eventually update as AVX BSOD'd my previously stable (20 ibt, 2 hours memtest) OC right quick. Clearly it is more stressful.
My opinion: Mark AVX-supporting+enabled processors separately. You have...
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Using latest linpack (from MS site) and Windows 7 SP1 RTM leak. Both are required for AVX instruction in IBT.
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Dalamar | Intel | i7 2600K @ 4Ghz | 099.2521 | 24.988 | 64-bit | AVX Instruction (W7SP1+updated linpack)
See this thread if you don't believe it.