What Wattage PSU For My Build?

[Oliboy68]

Hello all, 

 

I am in the midst of putting together my build which is as follows:

 

CPU: Ryzen 9 3900x

GPU: AMD 6800xt (or 3080)

MOBO: ASUS Tuff X-570 Plus Wifi

RAM: 32gb 3600

Storage: 1tb NVME SSD & 2tb SATA

CPU cooler: NZXT Kraken X53

Case Fans: 3 x 120mm & 2 x 140mm

Im not quite sure if I should get a Corsair RM750x or RM850x for my build? Will that be enough?

Would appreciate any advice, thank you.

 

(Advice on my build too if you want to)

[Fasauceome]

We're not sure if the RX 6000 series will have bad transient power spikes, but if it doesn't, you could reasonably use a 650 watt PSU.

 

Wait for reviews to see if the power draw is reasonable from these cards.

[Mateyyy]

10 minutes ago, Oliboy68 said:

Im not quite sure if I should get a Corsair RM750x or RM850x for my build? Will that be enough?

An RM750x would be more than adequate for those components, unless you get something like a 3080 Strix or FTW3 and shove 500W through it for no apparent reason.

[bellabichon]

I'd say a great 650W unit or a good 750W unit would cover your needs. As @Fasauceomementioned, the reason that RTX 3000 series cards need such beefy power supplies isn't because they're consistently drawing 400-500W, but rather because they have issues with inconsistent spikes in power consumption which can sometimes trip circuit protection and cause crashes. 

[Oliboy68]

On AMD’s website, the 6800xt shows a 300 watt power usage and they recommend a 750 power supply.

 

On pc part picker, i built my system however substituted the Gpu with a 3080 (320w) and the total usage came to 594w... Will a 650w PSU really be sufficient? Thanks.

[WhitetailAni]

I would advise a 750 watt unit for greater stability, though if you don't have the budget, an amazing 650 watt unit should be fine.

[Fasauceome]

30 minutes ago, Oliboy68 said:

On pc part picker, i built my system however substituted the Gpu with a 3080 (320w) and the total usage came to 594w... Will a 650w PSU really be sufficient? Thanks.

With a ryzen 9 3900X drawing about 150 watts and a 6800 drawing about 300, you'd have 200 out of 650 watts left for everything from the motherboard to the ram to the fans. 

 

In terms of a quality power supply, 650 will do the trick quite nicely. A 750 or 850 watt PSU is pretty reasonable if you were planning on upgrading to a 16 core CPU and overclocking in the future.