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Both EPS12V connectors need to be connected if you're using 2 processors. You may use a y-cable, but you'd need to make sure the 12V power rail can provide enough current.
You can run the power budget tool to determine whether the PSU is sufficient: http://www.intel.com/support/motherboards/server/sb/CS-030550.htm
You can define your PSU limits on each power rail in the tool
thank you for your answer. I bought an adapter cable from the 4 pin P4 cable to the needed 8 pin EPS12V connector. It seems to work this way, at least without much load (can't test much as I don't have hard disks in the system yet). If the system gets unstable under load I need an other PSU I think...
I have a basic workstation with 1 HDD, 2xE5520, 8800GT. I run the SC off a Enermax 525W PSU. I used the Outervision calculator to calc the PSU requirement, I only calculate the load to be 363W.
The Tech spec's say what the PSU need to deliver the 525W I have meets all the spec except that the +5V should be upto 30A and the Enermax is rated to 24A (Even the Enermax 1250W PSU can't do 30A on the +5V??) and for some reason (probally a typo) +12V3 should be 30A is the same (+12V1 & V2 are 16A??).