How many watts do I need for a custom loop w/ OC gtx 1080 and OC 8700k?

Sep 24, 2018
At the moment I have a 650w Bronze PSU and I am thinking of upgrading to a full custom loop very soon. I have a 360mm AIO and a Strix 1080 both with fairly high OCs on them but mainly my GPU is getting very hot. I have decided that I want to go for a custom loop but I'm worried I might be pushing my PSU a bit too far.

SPECS (at the moment)
Aorus z370 gaming 7
i7- 8700k (5.0 GHz)
Nvidia GTX 1080 (Asus Strix)
16gb Ripjaws V OC to 3600mhz
Corsair 650w Bronze PSU
(1) 1tb Samsung 850 evo
(1) 2tb Toshiba HDD 7200rpm
(6) Cooler Master Master Fan RGB (120mm)
NZXT Kraken x62
Corsair 570x
The psu you need is primarily gated by the graphics card.
650w should be ok for a GTX1080:

How hot is your gpu under load?
80c. is a common target for a graphics card.

Your case is a very nice one with 3 120mm front intakes.
That should be sufficient for cooling unless the extra fans(you say 6) are messing things up.

One problem comes with how you mount the cooler radiator.
You get the best cooling for the cpu if you orient the radiator to take in fresh air.
But, that heats up the motherboard and feeds hot air to the graphics card.

I think orienting the radiator to exhaust air is a getter option, but not optimum for cpu cooling.
A custom setup will be more efficient, but will have the same issues.

Your case can mount a high efficiency air cooler like the noctua NH-D15s.
It will cool the cpu just as well and. It will be quieter, more reliable, and will not leak.

If you want better fresh air intake, replace the front 120mm fans with higher rpm versions or use a pair of good 140mm front intakes.

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