Nvidia GTX 960 In Proliant DL320 G6. Will it work?

I am considering buying a Nvidia GTX 960 to put in a Proliant DL320 G6. The Proliant has:

• Dual Redundant 400W power supplies
• 2x Full sized PCIe 2.0 x16 slots

From What I have read Nivida says

120W Graphics Card Power

400W Recommended System Power

With current Hardware ILO shows I don't go over 200W... Thus I should Have 80W to spare, Right? I also know this would fill one PCIe Slot, but fill both PCIe Spaces. I am also aware that this card is meant for PCIe 3.0, Thus even with PCIe backwards compatibility I wouldn't get the full bandwidth.

It looks good to me... But to anyone with experience,