Server chips with low power consumption are in style an the Xeon E3-1230Lv3 certainly qualifies at a tiny 25W TDP.  It is a Haswell chip running at a peak speed of 1.8GHz which would be great for a small business or for a home server.  eTeknix compared the performance of this chip to the i7-4770K with a TDP more than three times that of the Xeon which is perhaps a little unfair to the E3 but is a familiar chip to most enthusiasts.  That said the Xeon doesn't fall too far behind in many tests and at $250 it is less expensive to slap into a Z87 motherboard and it will reduce your power bill somewhat.

"Intel’s Xeon E3-1230Lv3 CPU has been a hotly anticipated processor for a wide variety of target audiences – home users, office users, small business users and enterprise users. Today we’ve got an opportunity to put Intel’s enterprise Xeon E3-1230Lv3 CPU to the test in a professional home user or “prosumer” type of environment, by pairing it up with SuperMicro’s server-grade C7Z87-OCE motherboard. The Intel Xeon E3-1230Lv3 is an important CPU because it offers four cores, eight threads, a 1.8GHz base frequency, a 2.8GHz Turbo frequency and 8MB of cache all for a tiny TDP of just 25W."

Here are some more Processor articles from around the web:

Processors