Is 850W PSU sufficient enough for this build?

marka01 · 8 Nov 2017 at 15:12

i7 8700k 4.8Ghz OC
Noctua NH-D15
4x8GB Vengeance 3200 Mhz OC
2x Asus Strix 1080ti OC version SLI
2x SSD
5x chasis fans

By putting stock parts together PSU calculator shows it's just enough with a slack of ~100W but I have no experience in overclocking and not sure how would this affect PSU W usage? Please suggest.

DomBruv · 8 Nov 2017 at 15:15

What do you use this machine for may I ask, more than just gaming I'm guessing?

marka01 · 8 Nov 2017 at 15:23

Mining/Gaming/home media center. I already have all these parts so before assembling and powering on would like to know if PSU will not explode

lee32uk · 9 Nov 2017 at 00:44

Do you already have an 850W psu ? If so what make/model is it ?

marka01 · 9 Nov 2017 at 07:42

Yes I do. It is EVGA G3 850. Is it possible to figure out what is current W usage with just 1x 1080ti and then plug in another one if enough recourses left?

MrRockliffe · 9 Nov 2017 at 07:59

You'd be able to run it all on a 550W PSU with ease

marka01 · 9 Nov 2017 at 08:16

How? This is my part list more or less: https://uk.************.com/user/marka01/saved/4NL4CJ
And it shows 768W at present without cpu or ram being OC'd

pastymuncher · 9 Nov 2017 at 09:23

MrRockliffe said:
You'd be able to run it all on a 550W PSU with ease

No you wouldn't. He has a pair of 1080ti's each of which are capable of drawing up to 300w (even more when overclocked further). To be honest I wouldn't be that comfortable even with 850w and would probably be looking at a 1000w unit.

MrRockliffe · 9 Nov 2017 at 10:01

pastymuncher said:
No you wouldn't. He has a pair of 1080ti's each of which are capable of drawing up to 300w (even more when overclocked further). To be honest I wouldn't be that comfortable even with 850w and would probably be looking at a 1000w unit.

Didn't see there were 2.

850W is more than enough for that build however.

System power consumption for a 1080Ti with those specs is around 400W.

pastymuncher · 9 Nov 2017 at 13:22

A factory overclocked 1080ti by itself is capable of pulling 300w, even more when the user does additional overclocking. Add in a cpu overclock and I wouldn't advise anything less than a good 650w psu for a single 1080ti build. A 850w psu for SLI 180ti's is too borderline for my liking especially when overclocking as well.