Stop wasting time with these sissy desktop power supplies
They are higher quality, and cheaper too

I'm using the power supply of the HP DL380 G4
It actually puts out 47 amps at 12 volt, so enough to power the 2 blades
To power it on look for the  12 pins in the middle that look like this
:::
:::
Connect the bottom left pin
With the middle 2 on the third column on the right

If facing the connector
Left 2 large connectors are ground, right 2 are 12v
So you can use one ground and one positive per blade

I know these power supplies as I used a lot of these servers at work
And my servers have been up for the past 9 years, 24/7 so it can certainly handle the load

Her is a link for them on eBay
http://www.ebay.com/itm/HP-338022-001-575W-Power-Supplies-DPS-600PB-321632-001-367238-001-Lot-of-2-/360815991110?pt=US_Server_Power_Supplies&hash=item54024f1946