Power supply for GPU on HP Workstation Z640

[OKF]

We have recently bought HP Z640 and are trying to install a GPU (Nvidia GTX 1080). 

I was wondering how I could power the GPU?

Would it be safe to power it up by using a single 4 pin molex to 8pin PCI? 

Or is there another way of doing it? 

[BambiBoomZ · Accepted solution]

OKF,

Assuming they are not already used for another GPU, it seems worthwhile to first check for the pair of 6-pin power connectors intended for the system's GPU's.  These are located in the lower right corner of the chassis as you face it. 

They're easy to miss as they arrive in the system plugged into holding sockets on the back of the speaker enclosure. This keeps them out of the way when they're not in use. 

The reference GTX 1080 Ti uses one 6-pin and one 8-pin, but apparently some overclocked versions use 2X 8-pin.  In one of the office z620's, the 2nd CPU is a Tesla M2090 6GB which can draw up to a maximum of 250W, uses one 6-pin and one 8-pin so one of the 6-pin power connectors has a 6-pin to 8-pin adapter.  Have a look at the GTX 1080 Ti and see if it needs one or two 8-pin connectors and acquire that/those.

If these connectors are already in use, it is quite possible to use the Molex 4-pin that is paired with the optical drive power connection in conjuction with a Molex 4-pin to two 6 or 8-pin connectors.

If I might enquire, what are the uses for your z640?

Cheers,

BambiBoomZ

HP z620_1 (2012) (Rev 3) 2X Xeon E5-2690 (8-core @ 2.9 / 3.8GHz) / 64GB DDR3-1600 ECC reg) / Quadro K2200 (4GB) + Tesla M2090 (6GB) / HP Z Turbo Drive (256GB) + Samsung 850 Evo 250GB + Seagate Constellation ES.3 (1TB) / Creative Sound Blaster X-Fi Titanium PCIe sound card + Logitech z313 2.1 speakers / 800W / Windows 7 Professional 64-bit > > HP 2711x  (27"  1980 X 1080)
[ Passmark System Rating= 5675 / CPU= 22625 / 2D= 815 / 3D = 3580 / Mem = 2522 / Disk = 12640 ] 9.25.16   Single Thread Mark = 1903
[ Cinebench R15: CPU = 2209 cb / Single core 130 cb / OpenGL= 119.23 fps / MP Ratio 16.84x] 10.31.16

[OKF]

BambiBoomZ,

I have indeed mised those 2 plugs. This helps a lot. Thank you very much.

The idea is to use the workstation for calculations, using the GPU. 

Kind regards
OKF