650W Enough for 2x 1080 Ti ??

[MrN1ce9uy]

Is the SeaSonic PRIME Platinum 650W enough for 2x 1080 Ti mining rig?

*Edit: it would have lower efficiency being past 50% load, so it would be cheaper to get a 850W gold PSU right?

[simugames]

I don't think that's enough.
Motherboard and CPU are going to need some ca 100 Watts too.
And there should always be a little headroom left, a PSU isn't supposed to run at 100% capacity all the time.

[moonstruck]

I have 650W and 700W supplies who stop working when mining with 2 1080ti's on 100% power limit without other systems (no hdd/cpu/mobo).
Get 750W or more, gold or better.

[simugames]

as a recommendation, there should always be 200 Watts or so left when summing up all the power needs.

[MrN1ce9uy]

I have 650W and 700W supplies who stop working when mining with 2 1080ti's on 100% power limit without other systems (no hdd/cpu/mobo).
Get 750W or more, gold or better.

What kind of 650W and 700W power supply was it?

I know what all of you are saying. I wouldn't be mining at 100% power limit. More like 75%, ~185W per card.

185W
185W
100W+
---------
470W

But anyways, I still haven't bought a power supply. Kinda wishing I had last week when they were on sale. I'm using an EVGA 850 B2 right now. But I'm expecting to get some more cards.

[Metroid]

It's more than enough, make sure you put the power limit to 70%.

[X299]

It's more than enough, only if you limit power to 70% or lower.
SSD/cpu/mobo/ram,ram, is not more than 40W.

[abudfv2008]

I have 650W and 700W supplies who stop working when mining with 2 1080ti's on 100% power limit without other systems (no hdd/cpu/mobo).
Get 750W or more, gold or better.

What kind of 650W and 700W power supply was it?

I know what all of you are saying. I wouldn't be mining at 100% power limit. More like 75%, ~185W per card.

185W
185W
100W+
---------
470W

But anyways, I still haven't bought a power supply. Kinda wishing I had last week when they were on sale. I'm using an EVGA 850 B2 right now. But I'm expecting to get some more cards.

I think it was cheap one with Chinese watts 
There are shitpsu like aerocool which can't handle even 2 1070. While declaring 700w

[Metroid]

forget any chinese psu, they are crap, local retailer has one chinese psu 1850 watts and selling for $460, they are blood crazy asking that, i would not pay a single dollar for it.

[trillobeat]

Have been running 2x zotac 1080ti FE for weeks on 650w evga g2 with no issues. cards set to 70% tdp in msi afterburner

[QuintLeo]

Running the cards at 185, it should have enough capacity.

I'd be more worried about the junk "fancy name sleeve bearing" fan the Prime line uses.

[Bimmber]

Is the SeaSonic PRIME Platinum 650W enough for 2x 1080 Ti mining rig?

1 x gpu, around 220w
1 x gpu, around 220w
1 x PCI riser 30w
1 x PCI riser 30w
1 x CPU 35w - 65w
RAM, SSD, motherboard - 100w

Total around 665w. Because you should not run your PSU for more than 80% load 24/7, add 20%, which comes to 798, so 800w PSU as minimum.

[MrN1ce9uy]

Is the SeaSonic PRIME Platinum 650W enough for 2x 1080 Ti mining rig?

1 x gpu, around 220w
1 x gpu, around 220w
1 x PCI riser 30w
1 x PCI riser 30w
1 x CPU 35w - 65w
RAM, SSD, motherboard - 100w

Total around 665w. Because you should not run your PSU for more than 80% load 24/7, add 20%, which comes to 798, so 800w PSU as minimum.

I'm not sure what kind of system you are using but with only 2 GPU no risers and no way RAM, SSD, & motherboard = 100W. CPU is G3900 and = 18W max, 10W average at 100% mining ETN. Only time 220W is needed per GPU is to POST. Other than that, as previously stated, they only need 185W.

[MrN1ce9uy]

Running the cards at 185, it should have enough capacity.

I'd be more worried about the junk "fancy name sleeve bearing" fan the Prime line uses.

With a 12 Year Warranty it's hard to complain about the fan. We will see.

[PranDoW]

It has to be enough but better to take a bit more powerful power supply. Better to have at least 10% of the load in stock

[BScrk]

It has to be enough but better to take a bit more powerful power supply. Better to have at least 10% of the load in stock

Agreed, better have some xtra power... keeping in mind that you can easy limit power consumption using nvidia tools (before starting the miner). For example my 6 x 1070 rigs can mine with 98% efficiency on equihash / ethash / neoscript using only 850 W (66% power limit) for all the setup. Same on CryptoNight , 96% efficiency with only 700w (75w per 1070 instead of 150).
Try to play with overclocking + power limit, this is the key

[BScrk]

Noticed that all have at least 1600w PSU even if they use only 50% of the available power at runtime.
Always better have flexibility

[simugames]

1 x PCI riser 30w
1 x PCI riser 30w

PCI risers use that much power? 

[jillscarbrough]

1080 ti has a TDP of 250 W, The mathematical calculation is 2x250 = 500 W. if 650 W PSU only has the remaining 150 W, I think it's too less. not to mention POWER for MOtherboard, SSD, and USB RISER and other devices. It's safer to use a PSU 700 or 850 W, this is to keep the other device from less power.

[Neo-Geo]

I'd recommend a 1200W Titanium PSU fed by 240W 30A circuit to achieve maximum efficiency @ 50% load.