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850W PSU enough for 2x 7970s massively OC'd?

post #1 of 9
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Alright, so I got two water-cooled reference 7970s that can both do 1300Mhz @ 1.325v. I haven't tried cross firing them and running them together yet because AMD took forever to release the frame pacing drivers and I didn't have enough radiator space to keep them both under 50C. However the drivers are out and I have my second radiator and I'm about to try crossfiring these babies.

I know 850W is enough for 2x 7970s at stock settings, but how much wattage will they draw at 1300Mhz and 1.325v? My PSU is a Corsair TX850W if you need to know any other specs (I don't know them)
post #2 of 9
Because you have a very efficient cpu power usage wise, your TX850 will handle the job with those overclocked 7970s.
post #3 of 9
Not a problem at all. You will be fine.
 
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post #4 of 9
I was hitting ~ 750W in Tomb Raider with cards @ 1.3v. 850w will be fine but really should not be ruining a 80 Plus PSU close to 100%. Thats a lot of heat coming.
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post #5 of 9
I would want more otherwise it would be another variable when you start serious benching. Are those crashes cuz the gpu is at its limit or is it the psu? It really is a party foul when you cannot overclock more because of your psu.
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post #6 of 9
I have no problems with an 850w PSU and dual OC'd 7970s.
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post #7 of 9
I got this V850 PSU a couple weeks ago. I chose the 850 watt so that I had room to drop in another 7950 if I wanted to. My CPU uses probably 2x the power of a 3770k, youll be fine.
post #8 of 9
You ppl here really overclock? One gpu at max gold and higher clocks can and will draw 300w. That and depending on your loop and cpu can add up to a whole lot of watts.

Anyone here ever done load testing?

http://www.overclock.net/t/1389971/how-much-wattage-from-seasonic-do-i-need-to-run-3-x-7970s-in-one-rig-and-2-x-7970s-in-another-rig/0_40#post_19944794
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post #9 of 9
Quote:
Originally Posted by tsm106 View Post

You ppl here really overclock? One gpu at max gold and higher clocks can and will draw 300w. That and depending on your loop and cpu can add up to a whole lot of watts.

Anyone here ever done load testing?

http://www.overclock.net/t/1389971/how-much-wattage-from-seasonic-do-i-need-to-run-3-x-7970s-in-one-rig-and-2-x-7970s-in-another-rig/0_40#post_19944794

Both my cards and my CPU are overclocked.

My cooling stuff is admittedly on a separate PSU, but that is because it is way way more power draw then most loops will use. If I had a standard WC loop or air cooling a single 850 would be plenty.
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Behemoth
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RAMHard DriveCoolingCooling
2X4GB Patriot Viper Extreme 1TB Velociraptor 10k RPM w/ 64MB Cache Two Arqtik TEC Chillers in Series Arqtik SDD TEC Waterblock 
CoolingCoolingCoolingCooling
Two Ported/tapped MCP655 Pumps 2x Black Ice GTX 480 Gen2 Rads DD dual drive bay Res with LCD water temp monit... GPU Loop: Modded Enzotech Sapphire CPU blocks, ... 
CoolingOSOSMonitor
36x Globe 120mm 80cfm server fans Win 10 Pro Mint 15(KDE) 4K 28" Samsung U590D 
KeyboardPowerCaseMouse
Logitech G710+ Mechanical CM Silent Power M 1000watt Main, OCZ Z850W Slave Custom Mountain Mods Extended-Extended Ascension Logitech G502 Proteus 
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