server processor doesn't mean anything except for voltage changes and binning quality. (and in this particular case, retail vs OEM)
they can be used for the same purposes as regular processors, in fact, sometimes people prefer them as they can overclock easier.
unless you really need the 200 mhz, you're just as well off saving $100+ and getting the 4600+ with a decent aftermarket cooler (like the blue orb II, or zalman 7700) and some Arctic Silver 5 when it gets back in stock. http://www.newegg.com/Product/Produc...82E16819103541