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How big of a PSU do i really need

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Posted · Original PosterOP


so a couple of months ago i upgraded my GPU. I bought a vega 56 that i found for dirt cheap on amazon and i’ve wondered since if i need to upgrade my PSU. My current setup is:

6600k at 4.4ghz, 1.35 volts

vega 56 at +7% overvoltage, 1690mhz on the core, 950 on the memory

16gb of DDR4 memory 

2 HDDs and 1 SSD

and 4 random 80mm fans.

My current PSU is a corsair vs650, but when i put the setup in one of those online wattage calculators i get ~640W at load and ~690W recommended PSU wattage, which considered the vs650 is not the most efficient PSU, is waay more than it can handle. Lately i haven’t got much time to game but it seems to run stable enough that i haven’t seen it crash at these CPU and GPU overclocks, but i do remember crashing indefinitely when giving 1.4 volts to my CPU. I probably have to upgrade my PSU but how much wattage do i need? 850w sounds reasonable enough, so what are good 850 PSUs?

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31 minutes ago, kalo said:

online wattage calculators


32 minutes ago, kalo said:


oh no...



anyway id get a good 650W, the VS line is crap and online PSU calculators are utter trash

I spent $2500 on building my PC and all i do with it is play MTGA & watch anime at 720p...


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The original LAN PC build log! (Old, dead and replaced by The Toaster Project & 5.0)


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It's funny, bc the BQ calculator suggests 550w Dark Power or Straight Power for an overclocked 6600k&vega56 rig with 4 fans, and the mentioned drives.. :) According to BQ, the peak power requirement would be roughly 410w on full load.


a 600-650w unit will be more than enough.

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How did you test stability of overclock?

EX build: Liquidfy C+... R.I.P.

Current build:

Meshify C

Ryzen 5 1600x @4.0 GHz/1.4V

Gigabyte X370 Aorus Gaming K7

Corsair Vengeance LPX 2x8 GB @3200 Mhz

Alpenfoehn Brocken 3 Black Edition

Sapphire Vega 56 Pulse

Intel SSD 660p 1TB 

be Quiet! Straight Power 11 750w

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It's not whether or not the VS650 will work... it does work.


The true question is for how long it'll work.


You're advise to replace it when you can for something better, what's your budget and market place?

Workstation Rig:
CPU:  Intel Core i9 9900K @4.7ghz  |~| Cooling: Noctua NH-U12P |~|  MOBO: Asus Z390M ROG Maximus XI GENE |~| RAM: 32gb 3200mhz CL16 G.Skill Trident Z RGB |~| GPU: nVidia TITAN V  |~| PSU: Corsair RM850X 80Plus Gold |~| Boot: WD Black M.2 2280 500GB NVMe |~| Storage: 2X4TB HDD 7200rpm Seagate Iron Wolf + 2X2TB SSD SanDisk Ultra |~| Case: Cooler Master Case Pro 3 |~| Display: ASUS ROG Swift PG348Q 3440x1440p100hz |~| OS: Windows 10 Pro.
Personal Use Rig:
CPU: Intel Core i7 8700 @4.45ghz |~| Cooling: Cooler Master Hyper 212X |~| MOBO: Gigabyte Z370M D3H mATX|~| RAM: 16gb DDR4 3333mhzCL16 G.Skill Trident Z |~| GPU: EVGA Founders Edition GTX 1080 Ti |~| PSU: Corsair TX650M 80Plus Gold |~| Boot:  SSD WD Green M.2 2280 240GB |~| Storage: 1x3TB HDD 7200rpm Seagate Barracuda + SanDisk SSD Plus G26 480gb |~| Case: Cooler Master Case Pro 3 |~| Display Setup: Acer X34 3440x1440p100hz |~| OS: Windows 10 Pro.
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