GTX 780 Ti on 800W PSU - no 8-pin connectors

[Narrlok]

The ASUS GeForce GTX 780 Ti I've got requires two 8-pin PCI-e connectors but my 800W "90%" efficiency power supply (HP Z620 Workstation) only has two 6-pin PCI-e connectors. The card came with an adapter for two 6-pin to one 8-pin. Would it be enough for me to draw power from one of the SATA power connectors to power the other 8-pin slot?

 

[Bubbleawsome]

I doubt it. Even though that 780ti probably would fit into that PSUs total wattage, you probably couldn't get enough through those connectors. :/

 

[Narrlok]

http://www.newegg.com/Product/Produc...82E16812200420

Would two of these these be a viable option?

 

[Spanners]

http://www.newegg.com/Product/Produc...82E16812200420

Would two of these these be a viable option?

I'd say yes. If the specific rails (if it has more than one) and the PSU in general can handle the load I don't see any issue with the connector being able to handle it.

"Since the two extra pins of an 8-pin PCIe connector are just two ground wires looped back into two ground wires of the 6-pin layout, there's absolutely no reason to assume that a 6-pin connector can't do 150 Watt as easily as an 8-pin one"

"They weren't worried about putting too much power on a 6-pin. They just wanted to create a standard that ensured that the PSU on the other end of that connector could actually handle the load of the higher end graphics card."

http://www.jonnyguru.com/forums/showthread.php?t=7212&page=2

Just my view, disclaimer etc. etc.

 

[Rakehellion]

A 6-pin connector will work on an 8-pin GPU.

 

[Narrlok]

Thanks guys, I remember reading that there was a risk of damaging components with those 8-pin adapters, but the two PCI-Express 6-pin connections run on separate 12V rails rated at 18A each, so they should be able to push 216W each without trouble.