PSU for overclocking

alc0 · May 13, 2013

Hi!

I have a quick question:

http://www.techpowerup.com/reviews/Corsair/AX860/5.html

http://www.techpowerup.com/reviews/Corsair/HX850_V2/5.html

In these two reviews, there is a slight difference. In the review for the AX860, they measure it under 110% power draw, while for the HX850, they just test it at 100% max.

Can I assume, that while these two perform similarly in most of the tests up to 100%, they will continue to perform similarly after that too?
In other words; will the HX850 be able to deliver 950 watts as well?

The reason I ask, is because I have a GTX 560ti and an I5-3570K. I am about to buy myself a nice custom watercooling loop to cool everything, and I want to overclock the sh!7 out of both the CPU and the GPU, and I want to make sure that my PSU don't slow me down, at the same time as not adding unnecessary to my budget.

I've read a lot online, and the reviews on my GPU says it draws ~ 475 watts overclocked, and with my CPU at 1.5 Volts and 5 GHZ (hopefully) that will draw another 190-200 watts, the D5 pump will draw 20 watts at max, and the rest of the system will probably draw another 150? According to my calculations my system will need 845 watts at max. But if I replace the GPU with a GTX 680, and overclock that too, it might draw up to 930 watts, and I don't want to buy a new PSU again anytime soon. What do you guys think?

Thanks in advance

AlC0

completelyrandomname · May 13, 2013

750w is enough even for an overclocked 7970. Get the 750w of the HX PSU. Only get the AX if you want full modular PSUs. The Seasonic X series is usually a bit cheaper than the Corsair one though while providing almost if not the same internals.

ksham · May 13, 2013

Holy crap! The GTX 560 Ti will at most draw 210W if you have the 448 cores one. Otherwise, it'll draw a total of 170W. See here. A 850W PSU is way overkill. You can live with a 500W or a 550W.

alc0 · May 13, 2013

I am pretty sure I will need at least 850 watts everything included. This link with review says 516 watts when overvolted:

http://www.hardocp.com/article/2011/02/01/galaxy_geforce_gtx_560_ti_gc_overclocking_review/#.UZGClj7Rnig

And I know the CPU will draw 190, plus another 150 from the rest... Seasonic is not easy to get where I live, so my best choice would be corsair I think?

Do you think the HX will be able to deliver 900 + watts?

ksham · May 13, 2013

It says system power, not just your video card.

4745454b · May 13, 2013

First, watch the language.

As mentioned above that is indeed system power. Not just for the card. Either of those two PSUs could power your rig OC'd. Probably even OC'd with SLI. I'm not sure if the HX can do the same 950, AX is their top of the line? I vote to just get the cheaper of the two. Seeing as its more then you need.

alc0 · May 13, 2013

Oh... my bad, sorry. 700+ will be plenty then...

4745454b · May 13, 2013

Why worry about 100%+ load if you lack the system to get there?

Edit: It's like worrying if your car can handle 180MPH. It will never get that fast (probably...) so why worry if it can?

battler624 · May 13, 2013

i have a 750W PSU 2 HDD's 1 SSD 2 GTX 670's and i am overclocking to 4.4 on i5 2500k

alc0 · May 13, 2013

4745454b :

Well, I see it this way: GPU 326 watts, CPU 190 watts, D5 pump 20 watts and the rest of the system 120 watts. The total then will be 656 watts? If I add another OC'ed GPU at 326 watts, thats 982 watts. That might happen soon, and I am looking at potential PSU's. The test witch didn't use the same parameters intrigued me, and I am still curious about that

4745454b · May 13, 2013

Holy crap! The GTX 560 Ti will at most draw 210W if you have the 448 cores one. Otherwise, it'll draw a total of 170W. See here. A 850W PSU is way overkill. You can live with a 500W or a 550W.

You might want to read what people are telling you. 326W for a GTX560TI? Dual GPU cards like the 6990 draw that much. No way, OC'd or not, the GTX560TI draws that much. With two 6pin PCIe plugs it can draw around 225W max. It lacks the ability to get any more power. Even in SLI, 450W for GPUs, 190W for CPU and its more like 50W for rest of system is 690W. An 850W PSU is more then enough. As battler said even a 750W would do it.

Deleted member 217926 · May 13, 2013

4745454b :

^ This x 1000.

An entire system with a GTX 560 Ti uses ~320 watts.

Congrats on the mod status man!

alc0 · May 13, 2013

Ok then, so you are telling me that this guide is wrong about the wattage they describe?

http://www.hardocp.com/article/2011/02/01/galaxy_geforce_gtx_560_ti_gc_overclocking_review/#.UZGG1D7Rnih

It says -> system wattage = 516 watts, total system wattage without videocard is 190 watts. 516-190=326 no?

Its very possible that you are right and this guide is wrong, and that I have got some wrong facts, but I have just been asking some questions here, I have not offended anyone so I don't quite get why you are so angry?

4745454b · May 13, 2013

Not angry, don't mean to offend either. At least we know your not pulling numbers out of the air...

I honestly have no idea how they got those number. Two 6pin PCIe plugs can do 75W each, so 150W. Another 75W can come from the motherboard. "Max" draw should be ~225. I say "max" and ~ because you can draw a bit more then what's allowed. But 250W or so should really be it. And somehow they draw nearly 75W on top of that. Here is a review that matches what I know. And what Ksham said.

http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/50509-galaxy-gtx-560-ti-super-oc-white-edition-review-12.html

Notice at normal load the Hard review is already 100W higher. The only thing I can think of is Hard is listing the AC pull from the wall, and not the DC output of the PSU. 433W AC times your normal 80% efficient PSU = 346W, which agrees with the hardwarecanucks review. Or close to it. Best/only explanation I got.

Thanks Anort3. Got to do just about everything other then swing "the hammer". It's nice to not have to hit report, just do it.

completelyrandomname · May 13, 2013

http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_560_Ti/25.html

202w maximum for the GPU itself. The rest of your system will use about 100 to 150 watts. We are not angry... at least I'm not...

Under an overclocked scenario your system won't come close to 500w, probably 400w at most with the 560 Ti.

alc0 · May 13, 2013

Thanks for the enlightenment then. Nice to know about what is possible and not through cables and mobo. Allready have a 750 PSU, so no reason to upgrade it then... Well, that saved me about 170 $ or so... Thanks!

4745454b · May 13, 2013

Always good news. Now you put that money into a bigger GPU and pray your PSU can handle it. LOL. Kidding, a 750W PSU should have no issue with any single GPU out there. Even the GTX690 and 7990.

Deleted member 217926 · May 13, 2013

Thanks Anort3. Got to do just about everything other then swing "the hammer". It's nice to not have to hit report, just do it.

I'll bet. It is sort of frustrating hitting report over and over. I'm sure you will get to wield the hammer soon!

alc0 I am also not sure where they are getting those numbers. The other guys are correct about power draw though. It should not be possible for that card to pull that many watts. Here is a great list you can trust.

http://www.realhardtechx.com/index_archivos/Page362.htm

alc0 · May 13, 2013

4745454b :

Orders recieved

good site anort3, bookmarked

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