Wondered if Corsair TX650w can run 680oc SLI on my set-up. Any Help?

Shrewsie_B · Apr 17, 2013

I just built my first gaming rig (console gamer since birth), and now I'm geeking on all the upgradeable possibilities. I'm happy with what I have now (ecstatic actually, considering the contrast with consoles), but I'm just curious to see what could happen in the future. In the next 2-3 years I'm thinking that I'll probably go SLI on this new set-up and I have a million logistic questions, but I'll start with a simple one.

Here's my current set-up:

Intel i7 3770k @ 3.5 GHz
ASUS P8Z77-V MOBO
Gigabyte 680oc windforce 3x
TX650w power supply
1TB Seagate Barracuda HDD
Corsair 200r case
2 140mm corsair aftermarket fans
LG Blu-ray opt-drive

Would I be able to add another 680 as this sits now with no other additions?
--Keep in mind that I will probably be modestly overclocking the GPUs at some point as well.

Thanks for the help anyone...

inzone · Apr 17, 2013

A GTX 680 has a 550w minimum power supply requirement and what that means is that to properly power your system that includes a GTX 680 Nvidia is saying you should have a 550w power supply. To add another 680 and try to run that system on 650w is not going to work, I would like to see a 850w PSU in there. See for yourself;

http://images10.newegg.com/BizIntell/tool/psucalc/index.html

4745454b · Apr 17, 2013

A system with a GTX680 might need a 550W PSU, but the GTX680 itself does not. I think you know this as you didn't say you needed over 1.1kW.

TDP of the GTX680 is around 200W. Lets say 450W for two in SLI? He has a 77W CPU but its OC'd. This is harder to list, more so without knowing voltage settings. Another 125? And my usual 50W for the other stuff. 625W for SLI? 700W easy depending on your OCs on the GPUs. Your other issue is that your PSU only has enough native plugs to handle a single GPU. You really need to get a new PSU with four PCIe plugs, and probably at least 750W, if not more. If you run stock for the CPU and GPUs a 750W will be more then enough.

Shrewsie_B · Apr 17, 2013

Thanks for the quick responses guys. But I'm curious if the 750w you suggest, 4745454b, would be adequate for 2 manually OC'd GPUs (modestly, not insane) and (possibly) OC'd CPU?

JackNaylorPE · Apr 18, 2013

http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-680/specifications

Maximum Graphics Card Power - 195 W
Minimum System Power Requirement - 550 W

So 745 W if not overclocked. I'd use an 850 watter.

4745454b · Apr 18, 2013

With respect again I disagree. Doing the math above 625W stock for SLI will be fine. You don't need 745W+. That 550W that they recommend is for those crap PSUs out there. 195W GPU + 77W CPU = 272W. What is the other 278W for? Hdds and ram don't need that much.

I'm curious if the 750w you suggest, 4745454b, would be adequate for 2 manually OC'd GPUs (modestly, not insane) and (possibly) OC'd CPU?

Hard to say. I figured on 625W with the OC'd CPU and stock GPUs. I'm honestly not sure how much that OC'd CPU pulls. I wasn't sure of the TDP of the GTX680 and figured 450W, Jack's link says it's closer to 400W. So you already have a built in buffer of 50W for the OC. It really depends on how hard you push the OC. Stock clocks a 750W will be more then enough. OC'd I think it would be enough, but as suggested above an 850W might make more sense. You'll have a bigger power buffer for sure. I'm a bit odd in that I don't mind if my PSU has to output 90% of its power. Modern QUALITY PSUs should have no problem doing this. But because the OC introduces uncertainty, you should plan around it. 750W at least, 850W (or maybe even the big 1kW) if you can afford it.

Shrewsie_B · Apr 18, 2013

Thanks a lot guys! I really need to learn a few more things in the PC arena and you guys helped a bunch

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