Sun Fire T1000 6-core @ 1GHz
Oracle Solaris 11.1
at 24 threads each gets .06kh/s =1.44kh/s
They're $75 on ebay, 180W power consumption.
If I mine all month I can turn $10 of power into 75 cents worth of altcoins

compiling with -O3 made this .07 per thread, for a total of 1.68Kh/s
Compiling it with SunStudio instead of GCC will give you maybe even a little more (didn't test this for an "eternity" though).
BTW, running more threads then you a have
physical cores on a Niagara based systems will gain you absolutely nothing.