Those look like various IBM redundant PSU. At least 1460 watts, I'd say. FYI you can get 2000 watt bladecenter PSU on ebay pretty cheap! ($60 or less).
you are right,it is DELL ,very cheap, 600 * MSI 7850 1G , About 240Mhs and 250LTC/day
F-me thats a lot of power/heat..