How many watts does my pc need?

[senjour1]

How many watts does my power supply has to be if i want to run gtx 1080 8g with this set uprocessor: I5 7600k
Motherboard: Asus Strix H270F gaming
Ram: 16gb
Water Cooler: Corsair H100I v2
Monitor: benq

 

[superninja12]

650w would be great!

550w is needed.

 

[selenaanderson3387]

get a 550 - 650 watts PSU with 80% efficiency. it would be enough for your system unless if you are adding some extra fans in your system.

 

[markoroga2001]

Go for safe 650W from some good brand.
https://www.ebay.com/itm/Corsair-650W-CX650-CX-Builder-Series-PSU-80PLUS-Bronze-120mm-Fan-ATX-EPS/222980229346?epid=6005577321&hash=item33eaa848e2:g:n~8AAOSwRWVa-25- Corsair cx is good choice.

 

[jawlesspython04]

With a GTX 1080, you should be looking at a high quality 550-650 Watt PSU. The CX650 is lower end. I wouldn't recommend it with a higher end build like yours.

Any one of these should do fine.

PCPartPicker part list / Price breakdown by merchant

Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($81.99 @ SuperBiiz)
Total: $81.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-06-19 06:05 EDT-0400

PCPartPicker part list / Price breakdown by merchant

Power Supply: EVGA - SuperNOVA G2 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($60.81 @ B&H)
Total: $60.81
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-06-19 06:05 EDT-0400

PCPartPicker part list / Price breakdown by merchant

Power Supply: Corsair - TXM Gold 650W 80+ Gold Certified Semi-Modular ATX Power Supply ($53.98 @ Newegg)
Total: $53.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-06-19 06:08 EDT-0400

The EVGA SuperNOVA G2 has a $20 rebate right now. I would go for that. Its a steal for the price.

 

[Rexper]

650W why? That is the most useless wattage. Because most single-GPU systems will be fine on 550w or lower. Multi-GPU systems need 750w+.

550w is more than enough for an i5 7600k + GTX 1080. You could even run an i7 8700k + gtx 1080ti on a 550w PSU with overclocking. A system including an overclocked i7-4960X and GTX 1080, 335w was drawn from the wall. That's about 300w from the wall, at a gaming load, and your build will consume even less.

Often times a higher wattage PSU comes louder, more expensive, and at the risk of more damage in the event of a fault. And for what benefit? None. Even with GPU upgrades, fan and drive additions, etc, 550w is still more than enough.

What is much more important is the power supply quality, which affects your components' lifespan, overclocking, your power supplies life span, noise levels, and protection in a fault.

High quality power supplies that I recommend for your system include the EVGA G2, Corsair RMx, Seasonic Focus Plus, Bitfenix Whisper, and be quiet! Straight Power 11. 550W is fine.