GTX 780 Classified power configurations.

[Globber]

Hi guys,
I just got a gtx 780 Classified which has 2x 8-pin power connectors. My PSU has 2x 6-pin connectors and one 8-pin power connector left available. Can I use the dual 6-pin to 8-pin adapter included with my card and then just use the other 8-pin connector from my power supply together, to give me the 2x 8-pin power connectors I need? Or will this cause power problems due to there being cables of different length? Thanks for the help!
-Globber

 

[cub_fanatic]

Hi guys,
I just got a gtx 780 Classified which has 2x 8-pin power connectors. My PSU has 2x 6-pin connectors and one 8-pin power connector left available. Can I use the dual 6-pin to 8-pin adapter included with my card and then just use the other 8-pin connector from my power supply together, to give me the 2x 8-pin power connectors I need? Or will this cause power problems due to there being cables of different length? Thanks for the help!
-Globber

Cable length doesn't make a difference as long as it reaches. The adapter should work fine. The extra two pins are grounds, I believe.

 

[hunter315]

What power supply are you trying to use that only has 2 6 pin PCI-e connectors?

While cub_fanatic is correct in that the other two pins are just ground, the primary difference between the 6 pin and 8 pin connectors is that they denote how much power the GPU is allowed to draw, a 6 pin is meant to supply 75W and the 8 pin 150W, so a card running 2 8 pins technically has 375W available, while your PSU with its 2 6 pins is only meant to supply 225W(2x75W for the connectors + 75W from the slot). Most decent 550W PSUs come with 2 6+2 pin connectors so if you only have 2 6 pin connectors i question your PSU.

 

[Globber]

Yeah I was not clear on my PSU. It is a KingWin 1000W LAZER. Basically the ONLY KingWin PSU I would use, and it seems to be running no problem. I only had a single 8-pin and two 6-pins LEFT AVAILABLE from my PSU. This card is my second for my SLI configuration. I have gotten the second card installed with the adapter and everything seems to be running awesome! Frame rate on Heaven/Valley increased by about 55% or so, and that is with my cards down clocked to 1228Mhz, was running at 1293Mhz. Anything over 1228 is pushing my GPU temp on card #2 to over 80C(until water loop is complete) and throttling me. No issues with cable lengths or issues with power so far, PSU doesn't seem to be even getting much hotter under full load. Thanks for all the tips and help, it has been really fun learning SLI and NVidia overclocking setups. These EVGA Classified cards really impress me much farther beyond expectations, and price is plummeting with 900 series released, definitely the right price/time to get my SLI card.

 

[Globber]

Revamped my airflow to my GPU's and now running 1293 Mhz on both cards' GPU cores, and running 3375 Mhz on their memory. Using Classified Controller I have 1.1625v on the GPU cores and 1.61v on my memory. Max temps under Valley/Heaven have been around 74C. I feel like I could push it further but also don't feel I need to. Awesome GPU's these are! Beasts!

 

[cub_fanatic]

Yes, those are beasts. And, the GTX 780 in general is one of, if not the, best bang for your buck high end GPU right now. The EVGA Classified GTX 780 is selling for $340 on newegg with other non-reference versions from all the top vendors selling anywhere from $320 all the way to just over $290 which is where the GTX 770 and R9 280x was just a month or so ago. If it wasn't for AMD, we wouldn't be seeing pricing like this on these absolute beastly cards. I really see no reason for buying a GTX 980 other than bragging rights which are meaningless if you are on a fairly restricted budget. Once Nvidia decides to drop the GTX 980ti on us, then we should most likely see a similar price drop on the 980 like we did when the 780 dropped from $650 to $500 after the 780ti came out. It is hard to believe that some people paid $650 for a reference GTX 780 just a year and a half ago and now it is selling for less than half of that.