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.