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Conflicting Numbers Related To Wattage for Gaming Build

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Posted · Original PosterOP

Greetings all.

System builder for many years.


Attempting to calculate the wattage for a new gaming build.


I have a ryzen 5 2600

and an MSI Geforce 1660 Super (one, no sli)


1 7200rpm HD

Asus B450 Tomahawk motherboard.


I purchased  a 750watt psu to go with it.


When I googled the parts, The wattage says 450watts and 370watts just for the video card and cpu.

Yet when I used the cooler master watt calculator recommended by linus in his wattage video, the numbers are much lower.


When I use MSI's power calculator I get different numbers entirely.


This puts me well over spec.


Currently have a Rosewill 750watt psu but have not hooked up yet. Machine not yet built. Don't want to risk shorting out. Do I need an upgrade?


Attached pics for the results I get from these conflicting calculators.



Screenshot from 2020-04-10 15-04-41.png

Screenshot from 2020-04-10 14-21-32.png

Screenshot from 2020-04-10 14-21-48.png

Screenshot from 2020-04-10 15-10-44.png

Screenshot from 2020-04-10 15-19-26.png

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You'd be fine with a 450w and up PSU.

However not only the wattage but also the PSU's quailty are important,

Check our the PSU Tier list here on the forum and decide on a PSU through it.

For a system like yours anything over B+ would be ideal. Keep in mind not all PSU lines are equally good. 



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psu calculators arent always right as there are so many factors that need to be put in.  750w is more then enough for your build heck even a 450w would be fine

Current Rig=  AMD Ryzen 5 2600x, Asus Prime x470-pro, Asus strix gtx 1070 ti, 32gb Corsair Vengence Pro RGB 3000hz White, EVGA 750 P2 PSU, 500gb samsung 860 evo, 250GB Samsung 850 evo, 2tb seagate firecuda sshd,  NZXT H700i, EK Supremacy evo am4 RGB, EK strix 1080 full cover block, EK X-Res 140 d4 pump, EK SE 240mm Rad, EK SE 280mm Rad

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Posted (edited)

pSu CaLcUlAtOrS are useless and overestimate by a ton. The 1660 is a 120W GPU, so expect the system to draw about 200W under a gaming load. You would be much better off getting a decent 450W PSU. Important part is that it's decent. What model PSU did you get?

Edited by seon123
W =/= G



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I think the hoomans put their builds here?

Why do you hoomans give your builds a name? Here's my build, which I shall call "Do as I Say, Not As I Do" (seriously, don't get this build)


Ryzen 1500X @3,925 GHz

Cooler Master Hyper 212 Evo + 2x ML120

MSI B350 Tomahawk Arctic

2x8GB Corsair Vengeance LPX 3000 MHz CL15 (Micron B-die) @2933 MHz

Sapphire Radeon R9 280 Dual-X @1120 MHz / 1450 MHz

120GB 850 Evo

120GB Kingston SSD

500GB WD Blue

Cooler Master Elite 430

Seasonic Prime Titanium 650W

Logitech G710 with Kailh Box Jade

Logitech G502

HyperX Cloud

And my laptop, which I shall call "If It's Stupid But It Works" (It can actually play CS:GO at 50 FPS, and Civ V at 25 FPS)


Lenovo Thinkpad L460

Intel Core i3 6100U

4GB (probably) DDR4 2133 MHz

Intel HD Graphics 520 0.3-1.0 GHz

128GB Samsung MZ7LF128HCHP

Corsair M65 Pro RGB (worst mouse I've ever had)

Sennheiser CX 5.00G

And here would be where I would put a picture of my cat. But apparently, images are not allowed here. So take this instead (*ΦωΦ*)

Hello fellow night theme users

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Both the 450 and the 370 are full-system power, so they both take into account both CPU and GPU. In reality the R5 consumes at most 100W and the 1660S at most around 200, so any decent PSU above 450W or so (to give a bit of extra headroom) should be fine.

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Just ignore PSU calculators.

If you want to know the power consumption, look at reviews that test the CPU and GPU, all the other components are negligible.

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18 hours ago, HumansfirstComputersSecond said:

I dont see it listed on the psu tier. Good enough?

its there, tier D. 


i would suggest changing it. 

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