Depends, if you're overclocking or after silence. But I recommend the SLK-800A with a low noise 80mm fan, or even the SLK-900 with an 92mm fan, that is, if your motherboard has enough space around the cpu socket for it. The SLK-900U is attached to the mobo with bolts, so it's more work involved.
I have both btw. The 800 cooling an xp1800+ and the 900 cooling a p4 2.53ghz. Great performance!
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