667 mhz memory at 912 mhz and a core 2 duo e8400 @ 4.2ghz

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is this good all on air cooling and the front side bus is at 1872mhz i have 2 his radeon 3870's incrossfire mode at 795 , and 1260.

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What are the temps?

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36 to 55 c

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IF you're using an enclosed computer case, you could quiet the fan-noise with foam lineing, and a sound-baffle for the air inlets/outlets...

Also, if you live in a cold climate, it helps to position the CPU-case exhaust-side near your feet