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I've constructed a server that uses 2 Xeon E5-2620 CPUs and per Intel's recommendation I'm in the process of ordering a heatsink and I'm slightly concerned about thermal management. The case I'm using is well ventilated (the Coolermaster Cosmos II) but I have a few concerns regarding the adequacy of the heatsinks recommended by the MB manufacturer (Supermicro CPU HeatSink SNK-P0048PS). Can these heatsinks keep the Xeons within their normal temperature range? Shouldn't there be a fan on the heatsink?

Due to the low volume of literature on the topic I wasn't able to find anything conclusive.

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I just built a server with two of these chips (very nice machine) and I'm using these (…). They're soooo loud. I've been trying to get my motherboard to throttle them down somewhat.. So far, no luck. – Doc Mar 20 '13 at 22:09
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Rack servers don't usually have space for fans on the sinks, so I'm assuming that the heatsinks alone will do the trick...

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