Would you trust an HX750 to OC this rig?

[tackle70]

Hi all,

I am upgrading my rig to the following:

ASrock Z68 Extreme7 gen3 mobo

Core i7-2600k CPU

Noctua NH-D14

2x4GB of DDR3-1333 ram

2x 7970 in CF (XFX DD BE + MSI Lightning)

I have two hard drives, no optical drive, 6 case fans, and about 10 USB devices attached.

My power supply is an HX750 at the moment, which I have been very happy with. However, would you trust it to deliver enough power to this rig once overclocked? I know that it is plenty to handle everything at stock, but I plan to run the 7970s at 1200 MHz core and the 2600k at as close to 5 GHz as I can get it.

My XFX 7970 requires 1.225V on the core to run at 1200 MHz, the lightning hasn't been installed yet but I assume that it will be similar.

Do I need to upgrade my PSU? I'm thinking that it might be able to handle everything but am just not sure. Really don't want to upgrade if I don't have to. If you think I do need an upgrade, what do you think of the Corsair AX-1200 as an option?

 

[SnW]

Yes I do !

 

[PetrolHead247]

750W should just be enough to handle that rig. I'm guessing that rig would use just over 700W with everything fully loaded, so you should be fine

 

[marsey99]

i was going to say pretty much what petrolhead said tbh but also state that the psu might be throwing out less than rated depending upon its age.

question is what would really fully load it all outside synthetic tests?

for what its worth i would run that system on that psu but would keep an eye (or hand if you like) on the temp of the air its throwing out the back and if it got warmer than i like it would be next on the list.

 

[tackle70]

Thanks guys! I'll keep an eye on the temps. It's a 2 month old power supply, so pretty much brand new

I was just nervous that I might be pushing close to 900W of power with everything overclocked to the max... I was guessing based on reviews ~275W per GPUs @ 1.22+V + ~200W for the CPU @ 5 GHz + ~100W for everything else. Is that an overestimate?

 

[LiamTheBoss]

No you will be fine with that wattage plus corsair is a quality brand.

 

[KING_OF_SAND]

http://extreme.outervision.com/psucalculatorlite.jsp

 

[S_I_N]

I calculated out 652watts this is without overclocking your gpu's so say thats another 50watts. it puts you at about 85-90% of the psu. While that is just a tad over the 80+ efficiency mark imho it'll have your psu spinning up abit to keep it cool. I'd strongly recommend a 850 watter to be in the safer zone. Your running more than i am and I'm on a 850watter.