I've install Windows 8 at work, and it is nice! I won't go back.. I can work without the start menu now 
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Crunchers:
i5 2500k @ 4.7ghz | 4 threads @ 100% | HD7950 GPU
Xeon E3-3120 @ 3.1ghz | 4 threads @ 70%
Dell M6500 (i7 820QM) @ 1.8ghz | 8 threads @ 30%
Sempron 2600+ @ 1.8ghz | 1 thread @ 70%
X4 635 @ 2.9 | 4 threads @ 30%
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