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[Official] NVIDIA GTX 970 Owner's Club - Page 1050

post #10491 of 26194
that doesn't make sense, in a sense it contradicts in what you just posted.
Quote:
Originally Posted by Xoriam View Post

Quote:
Originally Posted by shilka View Post

No i said if you should get 750 watts if you have 2 high end cards like a GTX 780 / GTX 780 Ti / GTX 980, i have never once said that 650 watts is not enough for GTX 970 SLI it is and its more then enough power hell you can run 2 GTX 970 cards on a 600 watts PSU.
850 watts is overkill for 2 video cards and i have never once said 850 watts for 2 cards other then if you are going to volt mod them.

Well then I misunderstood.
Still sucks for me though because I'm going to have to change that 550watt PSU I have on my IVY setup because it won't power a single GTX 970 fully overclocked.

hint, two GTX970 mildly overclocked can theoretically fit in a 550W PSU.

edit: plus, even if you overclock the hell out of it, at most these cards can only pull 225watts due to 8pin max capacity (150W + 75W PCIE), or 6+6pin max capacity (75W + 75W + 75W PCIE).
and even 8+6pin max capacity (150W + 75W + 75W PCIE), it'll still fit in a 550W PSU, so long as that PSU is single-rail that is.
Edited by epic1337 - 1/5/15 at 4:26am
post #10492 of 26194
Goodness... It's kind of sad to see people ,, a 550/850W PSU for SLI...

My previous graphics cards 2x 670 FTW's @1,285MHz) and my rig would easily pull ~850-900W at the wall... However, even accounting efficiency, the PSU was pushing ~750w...

It's sad to me because my rig is a single 4930K, 32GB, 2x670's, R4BE, 2x250GB 840 Evo RAID0, 2x7,200RPM HDD's, 1KW OCZ PSU...

It quite surprises me to see people not just saying, "Hey, do you really want to go with the bare minimum, or have room to breathe so you are not only operating efficiently, but also letting your PSU last longer by running cooler and at lower load...?"

Then again, reason doesn't always win over, well, whatever it is that makes people choose the bad decision... lol
Edited by reev3r - 1/5/15 at 5:24am
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post #10493 of 26194
I'm currently running a 1500/7600MHz OC with a 2500k at 4.5GHz on an old Corsair VX550 (492w) with ease.

The only throttling I've noticed is in Shadow Warrior, with an unlocked framerate it's peaked at 115%, I managed to replicate this a couple of times and it drops the core to 1450~ish for a few seconds, no noticeable performance loss or stutter.
    
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post #10494 of 26194
Quote:
Originally Posted by reev3r View Post

Goodness... It's kind of sad to see people ,, a 550/850W PSU for SLI...

My previous graphics cards 2x 670 FTW's @1,285MHz) and my rig would easily pull ~850-900W at the wall... However, esdven accounting efficiency, the PSU was pushing

you do realize that wall power draw is not power output right?
900W on the wall means only 810W on the output @ 90% efficiency for example.

guess which part the PSU's capacity is targeting.
Edited by epic1337 - 1/5/15 at 4:47am
post #10495 of 26194
An EVGA 750 G2 will definitely run two GTX 970's overclocked, with a i5-4690k overclocked to 4.5ghz, with an SSD, HDD and DVD. I know this because I built and configured one for a client and I experienced no issues.

I'm not sure what all the fuss is about really. If you want PSU advice then this is certainly not the thread to be asking. Jonnyguru is a good source of info for PSU advice.
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post #10496 of 26194
dang didn't make it to edit, well this.

http://www.guru3d.com/articles-pages/geforce-gtx-970-sli-review,4.html
Quote:
Mainboard
MSI Big Bang XPower II (MS-7737) - Review

Processor
Core i7 3960 Extreme (Sandy Bridge-E) @ 4.6 GHz on all six cores - Review

Graphics Cards
GeForce GTX 970 2-way SLI with 4 GB GDDR5 graphics memory (per card)

Memory
8192 MB (2x 4096 MB) DDR3

Power Supply Unit
1500 Watt Platinum Certified Corsair AX1500i - Review


Measured power consumption GTX 970 2-way SLI

System in IDLE = 123 Watts
System Wattage with GPU in FULL Stress = 439 Watts
Difference (GPU load) = 316 Watts
Add average IDLE wattage ~10 Watts
Subjective obtained GPU power consumption = ~ 326 Watts

this is a bad estimate though, the load is concentrated on the GPU and CPU is lightly loaded, but still.
don't forget that GTX970 was meant to have a 145W TDP biggrin.gif
Edited by epic1337 - 1/5/15 at 4:56am
post #10497 of 26194
Quote:
Originally Posted by reev3r View Post

Goodness... It's kind of sad to see people ,, a 550/850W PSU for SLI...

My previous graphics cards 2x 670 FTW's @1,285MHz) and my rig would easily pull ~850-900W at the wall... However, esdven accounting efficiency, the PSU was pushing

so that's 748-792 watts power consumption with an 80+ gold psu.
Quote:
Originally Posted by cokker View Post

I'm currently running a 1500/7600MHz OC with a 2500k at 4.5GHz on an old Corsair VX550 (492w) with ease.

The only throttling I've noticed is in Shadow Warrior, with an unlocked framerate it's peaked at 115%, I managed to replicate this a couple of times and it drops the core to 1450~ish for a few seconds, no noticeable performance loss or stutter.

even though that psu is not great, you don't have a system that can overwhelm it. over half the 970's in this thread can run at those speeds without touching the voltage slider.
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post #10498 of 26194
that reminds me, has anyone tried undervolting their 970 yet? i mean how high can you clock at like 0.9v~0.95v

it would be interesting to see current draw on GPU-Z too.
post #10499 of 26194
Quote:
Originally Posted by reev3r View Post

Goodness... It's kind of sad to see people ,, a 550/850W PSU for SLI...

My previous graphics cards 2x 670 FTW's @1,285MHz) and my rig would easily pull ~850-900W at the wall... However, esdven accounting efficiency, the PSU was pushing
Quote:
Originally Posted by epic1337 View Post

you do realize that wall power draw is not power output right?
900W on the wall means only 810W on the output @ 90% efficiency for example.

guess which part the PSU's capacity is targeting.

My apologies, I dozed off while writing, and didn't realize it. I edited my post to reflect what I had planned to say. :-)
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post #10500 of 26194
GTX970 is still much noticeably more efficient though.
as i've mentioned, you can technically fit two GTX970 in a 550W with the only problem being limited number of wires, which means limited current.

its rare to see 550W having two 6pins for example, but theoretically it can be made with a bit of room to spare ( 3.5A or 42W to be exact ).
( e.g. 24pin 150W + 4pin CPU 150W + 6pin PCIE 75W + 6pin PCIE 75W = 450W | this is assuming PSU design is 12V 42A~45A )
such a PSU would only have 4sata/molex plugs though, it won't be a pretty build, and a very restricting one.
Edited by epic1337 - 1/5/15 at 5:58am
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