Not the person you're responding to, but I have the S2600CP2J w/ dual E5-2670, 128gb ram, 8 2-3tb drives + an ssd and I draw ~120 watts at idle (~3% cpu usage). 100% load is around 300-350 watts. No external video card.
Great budget server, motherboard + 2xCPUs + ram were just under $500 from NATEX, intel server case + PSU was $100 from ebay.