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Will 860 watts be enough for SLI 780 Ti?

post #1 of 12
Thread Starter 
Will the 780 ti consume more power than the titan? I have an i7 3770k no oc or anything, running everything on stock, how likely is it that 860 watts won't be enough for SLI 780 ti? i have the Corsair AX 860i
post #2 of 12
A quality 750w PSU is usually enough for 2 GPU's. I really doubt you'll have any issues with two 780Ti's with 860w and a 77w TDP processor.

Yes, your PSU should be just fine.
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Junkyard
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post #3 of 12
Thread Starter 
I assume you've been a long time involve with pc hardware and such, how likely is it that the 780 ti will need more power than the titan which is 250 watts, do you think the 780 ti could go even higher?
post #4 of 12
More than enough at stock. Enough for normal small OCing.

For overvolting and high OCs on two GK110 based cards you want something along the lines of a evga 1300G2. A single GK110 core at ~1.3v can spike into the 500W range. However if you're not planning on pushing the cards to the max it's not needed.
 
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post #5 of 12
Thread Starter 
Thanks to the two of you, really appreciate the help.
post #6 of 12
Quote:
Originally Posted by Alatar View Post

More than enough at stock. Enough for normal small OCing.

For overvolting and high OCs on two GK110 based cards you want something along the lines of a evga 1300G2. A single GK110 core at ~1.3v can spike into the 500W range. However if you're not planning on pushing the cards to the max it's not needed.

I'm curious to know how this is even possible? PCIe can only put out 75w for the slot, 75w for the 6pin, and 150w for the 8pin. Unless the 780's and Titans use 2x 8pin. That'd be 300w or 375w if its 2x 8pin. Newegg shows its a 6 and 8 pin, so that'd be only 300w that it could possibly take up. I could see going over that mark a little bit, but by 200w? You'd burn up the wiring or traces on the board, no?

Basically you're claiming you can DOUBLE the power that a Titan draws (251w at stock under load according to guru3d), by a heavy overclock? I mean I could certainly see this happening with massive hardware volt mods, but I don't see software (BIOS) volt mods causing that much of a power increase.

My 2 cents, I could easily be wrong. The math just doesn't add up. I'll admit, I don't own, nor have I ever owned a GK110 card.
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Junkyard
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post #7 of 12
Quote:
Originally Posted by pioneerisloud View Post

I'm curious to know how this is even possible? PCIe can only put out 75w for the slot, 75w for the 6pin, and 150w for the 8pin. Unless the 780's and Titans use 2x 8pin. That'd be 300w or 375w if its 2x 8pin. Newegg shows its a 6 and 8 pin, so that'd be only 300w that it could possibly take up. I could see going over that mark a little bit, but by 200w? You'd burn up the wiring or traces on the board, no?

Basically you're claiming you can DOUBLE the power that a Titan draws (251w at stock under load according to guru3d), by a heavy overclock? I mean I could certainly see this happening with massive hardware volt mods, but I don't see software (BIOS) volt mods causing that much of a power increase.

My 2 cents, I could easily be wrong. The math just doesn't add up. I'll admit, I don't own, nor have I ever owned a GK110 card.

the wattage amounts everyone always quotes for the pci-e slot and the power connectors are just what those connectors are rated for. They're not guaranteed to work after you pass those numbers but you can definitely draw more power from them. There's no hard limit anywhere.

As for GK110 cards drawing that much. At stock they're artificially limited to 250W. You just can't physically draw more than that at stock even though the cards would definitely benefit from that. Once you raise the power limit with the stock BIOS you can use 265W.

However pretty much everyone on OCN who OCs GK110 cards is using a custom bios. A bios without any meaningful power limitations. Without those limits a GK110 card at the max Nvidia allowed voltage (1212mV) will be maxing out in the 330W range (if you clock this high with the stock bios your card will throttle to keep the power consumption down). Once you remove the restrictions from MSI afterburner and get into the 1.25v range you're approaching 400W, get to 1.3v and you're approaching 500W and once you go over that you'll definitely be spiking over 500W power usage for the card alone. Biggest numbers I've seen have been spiking close to 600W when using close to 1.4v.

This is pretty standard for really high OCs on Nvidia's big chips. I remember reading about the testing Shamino did on Kingpin's forum back in the GTX 580 days and under LN2 with enough volts a single card would surpass 800W. Same applies to GK110 based cards.
 
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post #8 of 12
Thread Starter 
So basicly a stock 780 can't pull more than 250 watts unless it has a modded/different bios? Sorry if I'm asking stupid questions here, I just haven't looked much into overclocking since I barely used half the power of my 680s so there was no need for oc.
post #9 of 12
Stock 780 is limited to 250W.
When you OC normally (with stock bios) you can increase that power draw to 106% or 265W.

Going over that requires flashing your bios to a custom one (which is really easy but anyways).
 
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[Crossover 27Q LED-P 1440p+ASUS 1200p+LG 1080p] [Corsair AX1200] [Dimastech Easy v3.0] [Sennheiser HD558s] 
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FX 8320, FX 8350, Phenom II x2 555BE i7 3930K, i7 860, i7 4770K, 68x Celeron D CVF, commando, 2x RIVE, Z87X-OC Asus 4870x2, Sapphire 4870 
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CPUMotherboardGraphicsRAM
[i7 5960X @ 4.8GHz] [Rampage V Extreme] [Titan 1400MHz (1500MHz bench)] [Various] 
Hard DriveCoolingCoolingCooling
[250GB 840EVO +2x SpinpointF3 1TB RAID0] [LD PC-V2 SS Phase Change] [XSPC X2O 750 pump/res] [Monsta 360 full copper + EK XT 360 + XT 240] 
MonitorPowerCaseAudio
[Crossover 27Q LED-P 1440p+ASUS 1200p+LG 1080p] [Corsair AX1200] [Dimastech Easy v3.0] [Sennheiser HD558s] 
CPUCPUMotherboardGraphics
FX 8320, FX 8350, Phenom II x2 555BE i7 3930K, i7 860, i7 4770K, 68x Celeron D CVF, commando, 2x RIVE, Z87X-OC Asus 4870x2, Sapphire 4870 
GraphicsGraphicsGraphicsGraphics
2x 5870, 5850, 5830, 5770 2x 3870x2, 3870 GTX Titan, GTX 480, GTX 590 GTX 285, GTX 260, 4x 9800GT, 8800GTX 
RAMHard DriveCoolingCooling
4x4GB vengeance, 2x4GB predatorX, 2x1GB OCZ DDR2 Intel X25-M 80GB LD PC-V2 SS Phase Change OCN Marksman 
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post #10 of 12
Thread Starter 
Got it.

Thank you.
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