since it doesn't come with heatsink/cooler, what do I need to buy in addition to the chip? (is there a specific heatsink for it?)

Yes you need a heatsynch sync specific to the form factor of your mother board. I believe a artic freeze Newegg pn 9SIAB7G48H8360 for zeon will come with multiple brackets to fit your mother board.

Is this overclockable?

No idea, we are running at stock speeds and do not OC any of our servers. Sorry.

Questions & Answers: Intel Xeon E5-2650 2.0GHz (2.8GHz Turbo Boost) LGA 2011 95W BX80621E52650 Server Processor

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Intel Xeon E5-2650 Sandy Bridge-EP 2.0GHz (2.8GHz Turbo Boost) 20MB L3 Cache LGA 2011 95W BX80621E52650 Server Processor

32 nm Sandy Bridge-EP
20MB L3 Cache
95W

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