R720 onboard SATA power

[ybcnyc]

i have R720 with M1015 in IT mode however R720 won't allow booting from addon card (correct me if I'm wrong, but i don't see option in BIOS). So i removed the 2 SSD in raid1 from the front bays and would like to connect them to the two internal SATA connectors however there's no SATA power available. There's some sort of 8pin connection on the motherboard for GPU card

and something like this would work

http://www.ebay.com/itm/StarTech-SA...870784?hash=item43d20ceb00:g:ZqoAAOxy-gBSBAVD

however it'd need to go to SATA female to hook up power to the two internal SSDs.
any input is appreciated.

Thanks