Is my 1000W PSU enough?

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Elusiveillusion

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Feb 16, 2017
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When buying all my PC parts I calculated the usage using a PSU calculator, but I'm still paranoid that it may not be enough and maybe I should have bought a higher PSU.

Here's what I'm running:

EVGA SuperNOVA 1000 P2, 80+ PLATINUM 1000W
Intel Core i7-6850K 3.6GHz 6-Core Processor
NZXT Kraken X62 Liquid CPU Cooler
ASRock X99 Taichi ATX LGA2011-3 Motherboard
Corsair Vengeance LED 32GB (4 x 8GB) DDR4-3000 Memory
Samsung 850 EVO-Series 500GB 2.5" Solid State Drive
Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive
3 x Asus GeForce GTX 1080 8GB STRIX Video Card (Only 2 way SLI is supported but I use them for a GPU render engine)

Any advice is greatly appreciated.

Thanks,
 
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greens
I'm coming up with around 720W peak 12v demand.
Your PSU is pushing 83 amps on the 12v rail, for an actual 996W.

I'd say you're golden!
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raisonjohn

raisonjohn

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Intel Core i7-6850K 3.6GHz 6-Core Processor = 140W Max. TDP
NZXT Kraken X62 Liquid CPU Cooler = (For Headroom Purposes) ~10W TDP
ASRock X99 Taichi ATX LGA2011-3 Motherboard = (For Headroom Purposes) ~20W TDP
Corsair Vengeance LED 32GB (4 x 8GB) DDR4-3000 Memory = 4 x 5W Max. = 20W Max. TDP
Samsung 850 EVO-Series 500GB 2.5" Solid State Drive = 3W Max. TDP
Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive = 9W Max. TDP
3 x Asus GeForce GTX 1080 8GB STRIX Video Card = 3 x 180W Max. = 540W Max. TDP
TOTAL MAXIMUM TDP = 742W (at 100% load, includes headroom already)

Typically, you *would* probably be using just about 50-60% of the max. TDP on an average daily use (only you can confirm this). So, with this assumption, TDP would just be around 370W-ish to 450W-ish. This means drawing around 37%-45% of a continuous 1000W PSU load (close to the 50% highest efficiency energy consumption of a PSU).

However, assuming you will be running your system at full load 24/7 (i.e., 750W-ish), yes, the 1000W PSU would still be sufficient (drawing at 75% of that PSU).
 
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Chugalug_

Chugalug_

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Please read the post fully next time.
"under load"
And yes, he has three 1080s, that's to be expected. If using the third GPU for rendering it'll be around 900-950.
The PSU doesn't shut off after 1000w anyway, OVP'll kick in around the 1100w mark.
 
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raisonjohn

raisonjohn

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Yes, please do the same with my post as well:

I said:
TOTAL MAXIMUM TDP = 742W (at 100% load, includes headroom already) --> "100% load"

Typically, you *would* probably be using just about 50-60% of the max. TDP on an average daily use (only you can confirm this). --> "average daily use" i.e., not 100% load in 24/7, which only the OP can confirm as he is the operator of the rig.
 
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Chugalug_

Chugalug_

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Put it this way; an x99 CPU draws quite a bit of power, especially with an overclock.
With SLI 1080s you can get away with a 750w PSU at stock settings and an OC'd 6700k in personal experience, but with three 1080s and a 6 core CPU it's going to be higher than that under high load.
Not stating that it will run at that 24/7, only under high usage scenarios.
 
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raisonjohn

raisonjohn

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Ok, that's a bit more clear... it's not 24/7, but under high usage scenarios. Because I never said that 450W-ish TDP is under that same scenario. I was talking about *probable* average daily power consumption when the OP's rig is on (taking into account the OP's probable use in a given time-period including gaming, using 1, 2, or all GPUs in heavy load, idling, desktop use, network, etc.) to which the OP can only determine. I was surprised and confused that you put "450W-ish" (average daily TDP I mentioned) with your "an average of 800W under load" in a single sentence -- but we are talking about different scenarios.
 
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raisonjohn

raisonjohn

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Here's an example: Given a 620W (continuous) PSU. All my PC parts can draw maximum of 500W from the wall if I am using it during gaming (i.e., full load on the GPU, max. 60% load on the CPU, etc.). If I use the same components during editing work, it only draws maximum 200W (i.e., max. 80% load on the CPU, max. 5% load on the GPU, etc.).

If I built this PC purely as a gaming-machine, then I know that it's maximum power draw would be 500W, or 80% of the 620W supply. Using it everyday for gaming only, the max. power draw of 500W would be my average daily consumption.

If I built this PC and use it solely for editing work, then I know that it will never go past 200W power draw from the wall, or 32% of the 620W supply. Using it everyday for purely editing work, the max. power draw of 200W would be my average daily consumption.

However, my actual PC usage is estimated at a combination of 70% for working and 30% for gaming. This means 70% of the time, the power draw of the PC from the wall is at max. 200W only; while 30% of the time, it can reach max. of 500W.

Using my PC daily at the above rate would mean that:

[100% / Avg. Draw in watts] = [70% / 200W] + [30% / 500W]

1 / Avg. Draw in watts = 0.70/200W + 0.30/500W
1 / Avg. Draw in watts = 0.0035W + 0.0006W
1 / Avg. Draw in watts = 0.0041W
Avg. Draw in watts = 1 / 0.0041W
Avg. Draw in watts = 243.90W ---> Daily Avg. Total Draw Power of my PC (based on max. load possible per type of use)

So, theoretically, in my daily average usage (i.e., not full load usage), taking into account all other minor possible usage other than editing and gaming (such as surfing the net, watching movies, etc.), I am using roughly 40% of my 620W PSU (which is ~244W).
 
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