Power supply for 1080 + 1080 ti

[x34c]

I have this PSU at the moment

https://www.scan.co.uk/products/750w-evga-supernova-750-g1-80plus-gold-full-modular-sli-crossfire-quad-rail-61a-plus12v-1x135mm-fan-

Will it be enough, both cards in the same system, and yes I know they can't be used together, I don't need it to be.

I have 2 SSD's, 16gb ram, 7700k.

The cards will be stressed out aswell which is a major factor.

 

[Isokolon]

Will the CPU be overclocked?

It will put a lot of stress on the unit and personally I'd rather have 850W especially since the G1 isn't known to be top notch
But generally it will suffice unless you apply some crazy overclocks or some Zotac AMP with their ridiculous high power target

 

[Aeacus]

Trying to build mining rig?

Either way, GTX 1080 and GTX 1080 Ti combined consume about 480W. Add the rest of the system to it at about 200W and you're looking towards 700W, more with CPU/GPU OC.

Your 750W PSU is way too less for your system, especially when you plan to push both GPUs hard in a mining rig. To power all that, you're looking towards 1kW PSU, e.g Seasonic PRIME series,
80+ Gold, specs: https://seasonic.com/product/prime-1000-w-gold/
80+ Platinum, specs: https://seasonic.com/product/prime-1000-w-platinum/
80+ Titanium, specs: https://seasonic.com/product/prime-1000-w-titanium/
pcpp: https://pcpartpicker.com/products/compare/PfjWGX,XfjWGX,PxBrxr/

My Skylake build is also powered by Seasonic PRIME series PSU but mine is 80+ Titanium and 650W (full specs with pics in my sig).

 

[x34c]

Mixed replies there, I will be using it for something quite similar to mining and also most likely mining itself at some point, although I'm still not sure if mining is even worth it at this point.

I'm still unsure after these replies.. my TI is coming tommorow so I guess I'm going to have to just try it out.

 

[Aeacus]

850W PSU will also do, though giving you less headroom on wattage vise than 1kW unit (about 100W - 150W).

As far as running 2 GPUs with your 750W unit goes, one out of 4 things can happen:
1. Your PC will run fine when pushing both GPUs.
Though, pushing PSU hard will wear it out much quicker.

2. Your PC shuts down due to the overload on your PSU.
Afterwards, your PC turns on again just fine. With this, you can operate your PC but you can't push your GPUs.

3. You blow your PSU due to the overload on your PSU.
In this case, you're looking towards new PSU.

4. You blow your PSU due to the overload on your PSU and your PSU fries some or all the internal components it's connected to.
This is worst case scenario and with this, you're looking towards whole new PC.

 

[Isokolon]

Frying your whole system by blowing the CPU is pretty unlikely. While the G1 isn't a too notch unit, its not some burn-your-house-down junk.

With 480W GPU draw and a typical CPU draw of no more than 120W you're looking at 600W.
If you don't put a water cooling setup in there, 60W is enough for board/Ram/SSD/aircooler, leaving some room.
The unit is designed to put out the rated power, that's what the manufacturer gives warranty for.

While the Prime titanium is a great unit there's hardly real use for it, especially at it's price. Of course it's great to buy the safest and most luxurious car, but in the end a solid civic will bring you from A to B if you do sufficient maintenance and checks.

If the PSU is insufficient you're mostly looking at system instability and shut downs. Maybe bluescreens but those shouldn't be happening. If there last really is an overload the system might shut down and the PSU won't boot again.
I'd feel better with a bigger and better quality unit, but I reckon that a Corsair RMx or EVGA G3 or some other higher class gold efficiency unit will do fine. Platinum and titanium efficiency is still tough to achieve and the price/value ratio just isn't right yet imo
Just my thoughts.

 

[x34c]

I bought an 850w psu in the end, everything working smoothly thanks