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Corsair AX860 for 4770K and GTX 780 Ti SLI - Page 3

post #21 of 118
Quote:
Originally Posted by cadaveca View Post


Tri-monitor, I hit 300-320W per card. And yes, the built-in boost controls will clock the cards down...but they still hit that power consumption on peak.

I'd like to know how you measured those cards to come up with 300-320W per card. That's well in excess of published NVidia specs for the 780 Ti unless they've been factory or user overclocked/over-volt.

Here's a reputable review with measurement methodologies listed that quotes them at 262W under full load. Two in SLI draw 508W. That's consistent with several other reviews out there.

http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,4.html

860W PSU is plenty for 4770K + two 780 or two 780 Ti at stock clocks. With plenty (at least 25%) overhead to spare.

Greg
post #22 of 118
Quote:
Originally Posted by shilka View Post

Not angry with your or anything but i think i should it make clear that i did not make a brand recommendation i made a model recommendation

All other EVGA units are mediocre its only the G2 and P2 that are worth buying

Cool! thumb.gif I only mentioned the 1200i since the 860i was already mentioned. Same thing, more power.
Quote:
Originally Posted by hammong View Post

I'd like to know how you measured those cards to come up with 300-320W per card. That's well in excess of published NVidia specs for the 780 Ti unless they've been factory or user overclocked/over-volt.

Here's a reputable review with measurement methodologies listed that quotes them at 262W under full load. Two in SLI draw 508W. That's consistent with several other reviews out there.

860W PSU is plenty for 4770K + two 780 or two 780 Ti at stock clocks. With plenty (at least 25%) overhead to spare.

Greg


No, that's well in excess of TDP...which is THERMAL DESIGN POWER. Nvidia states that power of the GPU is 250W... however, boost increases clock speed, voltage, and power consumption above that 250W which can lead to peaks in power consumed far in excess of that 250W. I didn't say that the cards consume 300-320W CONTINUOUSLY. That's peak only. But that peak draw, even for a fraction of a second, is enough to shut down a PSU.

Do keep in mind NVidia suggests 600W PSU for a single 780 Ti.
Edited by cadaveca - 3/11/14 at 2:02pm
post #23 of 118
What motherboard are you running that 4960X with cadaveca, and what's your "idle" power consumption at? There's a big power consumption difference between a 4770K w/2 DIMMS on a Z87 and a 4960X w/4DIMMS on a X79. You're looking at close to 70-80W. That, and 853W at the wall is only 767W output DC and that assumes an awesome 90% efficiency.

I still think the OP is going to have 200W worth of overhead on a typically loaded 4770/SLI 780Ti system with that PSU, but I'm all for "bigger is better." Get what you like, it won't matter in the end except for the initial cost and a few pennies a month in power difference.

Greg
post #24 of 118
I'm apt to say no just because you might want to give those 780ti's (or whatever you have next) more power down the road if you end up going under water.

While I didn't buy my 1200w PSU, I do tend to believe in getting more than you necessarily need to accommodate for higher overclocks or more power hungry components that are swapped more often. My single card, on air, can bring my system load to well over 650w.

There isn't any need to factor in the D5 to be honest, WC doesn't use very much power unless you go overkill on the fans.

There certainly isn't any real need in buying an AXi over another brand unless you want to stick with Corsair purely for their customer service (top notch). Otherwise the P2 would be my choice. If you really don't plan on ever overvolting then yeah, an 860 would be just fine.
 
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post #25 of 118
I just tested a pair of 780ti's for a friend, on a 750W capstone-m. ( his board ended up with a dead pcie slot :[ )

I do think youll be okay on the AX860.

This would be different if you were an avid benchmarker, but if all you do is game, you SHOULD be okay.
post #26 of 118
Quote:
Originally Posted by hammong View Post

What motherboard are you running that 4960X with cadaveca, and what's your "idle" power consumption at? There's a big power consumption difference between a 4770K w/2 DIMMS on a Z87 and a 4960X w/4DIMMS on a X79. You're looking at close to 70-80W. That, and 853W at the wall is only 767W output DC and that assumes an awesome 90% efficiency.

I still think the OP is going to have 200W worth of overhead on a typically loaded 4770/SLI 780Ti system with that PSU, but I'm all for "bigger is better." Get what you like, it won't matter in the end except for the initial cost and a few pennies a month in power difference.

Greg


Dude.... I review motherboards and memory for techpowerup. You're not telling me anything I don't already know. tongue.gif

Normally, I'd agree with you...but man, I bought these 780 Ti's retail, and they run far over boost clock, and far over "TDP", or whatever power figure you want to come up with. It's a big pain in my ass, really.

But what made me really notice was the multi-monitor power consumption, which is shown above...single-monitor..forgeddaboutit.

So, I have to cover worst-case scenario, which my rig seems to be. Yeah, If I pop them into one of my Z87 rigs, power goes down by 90-140W. I use a 1275W Platinum-rated PSU, so yeah..94% efficiency, not 90%, so I am very glad my rig exceeds your expectations in many ways. tongue.gif Matches what our PSU reviewer got out of the unit here:

http://www.techpowerup.com/reviews/Thermaltake/TPX-1275M/5.html

thumb.gif
post #27 of 118
4770k and a couple of reference 780ti gpus will run fine on an AX860. Can't go past 1.21v(locked) on the gpus, so they'll be in the ~300w range max with overclocks.

CPU uses little power, 100w or so with overclocks. 50w for the motherboard, ram, fans ect.

Good to go.thumb.gif
    
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post #28 of 118
Quote:
Originally Posted by MrTOOSHORT View Post

4770k and a couple of reference 780ti gpus will run fine on an AX860. Can't go past 1.21v(locked) on the gpus, so they'll be in the ~300w range max with overclocks.

CPU uses little power, 100w or so with overclocks. 50w for the motherboard, ram, fans ect.

Good to go.thumb.gif

I would have to agree with this deduction.
    
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post #29 of 118
I'm running my entire rig on a AX850, with everything overclocked. My entire system draws about 750w from the wall (so about 637w total system draw) with heavy gaming usage... so you're fine.
Edited by Arviel - 3/11/14 at 2:22pm
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post #30 of 118
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