Question 550W vs. 750W PSU (EVGA G3)

Jul 14, 2019
First of, my current build:
Intel i3-7100
MSI R9 270 2GB DDR5
ASRock H270M Fatal1ty Performance

Crucial Ballistix 8GB DDR4 RAM @ 2400MHz
Toshiba P300 3TB HDD 7200RPM
MS Industrial 500W PSU

This build I plan on upgrading in the future, going on to an unlocked i5 or i7 (whatever is available and in the budget) for some light overclocking, an ROG STRIX RX 580 8GB OC (this one I am getting for sure, but I plan on going for a 1080 later, so keep that in mind), G. Skill Ripjaws 32GB DDR4 kit (16GBx2) @3200MHz (maybe to 64GB way down the line, a new MOBO, Dark Rock Pro 4 and maybe a 1TB SSD or M.2 (not really needed, but not the point of this thread). Of course I need a new PSU for all this.

While researching, I came across the G3. The first video I watched is this one from Tech Deals, where he stated that using this 550W G3 EVGA PSU with the following:

i7 8700K OC @5GHz (or a Ryzen 7 2700)
GTX 1080 Ti OC @2GHz (or Vega 64)
16GB or 32GB RAM
Several SSDs and several HDDs

he still had comfortable headroom. This blew me away, because like a little bitch I am STILL very paranoid about it.

Jonny Guru also reviewed the 750W G3 and gave it an AMAZING 9.8/10 rating. DAMN.
Redditors also gave it good reviews, as you can read about it here.

I actually do not intend to go for a 550W PSU, but I mentioned it just because of how great it is. A PSU is serious business and I want ALL THE CONFIDENCE in what I choose. I want a lot of headroom for future upgrades, so I don't have to buy a new one when I do upgrade the GPU and other components. I want to buy it and be done with it, completely. Maybe I buy a second GPU, maybe I don't, who knows. I probably won't, since I think one great GPU is better than two alright. But who cares? I want that option in the future and not think about it.

I also realize that buying a 1500W PSU for a low consumption 200W PC is literally a waste of money on the electric bills. I'm aware.
You may tell me to get a 650W G3, which is in-between and better suited for my wanted build. I'm still aiming for 750W for the future, but do change my mind with a reply.

The money is not a problem since it is only a 10€ difference between them where I live (550W - 100€, 650W - 115€ and 750W - 125€).

Looking forward to your replies. Cheers.

Jul 14, 2019
A solid 550w is enough for nearly all single GPU setups to date.

That psu is of great quality and is more than enough for a 580 and I5 or I7.
No need to worry.
I appreciate it. But, since a bigger PSU like the Corsair RMx 750W or even 850W isn't that more expensive than the 550W (at least in my country) and it won't have that big of an impact on my power bill, I think its actually good to have that headroom and the ability to upgrade. Especially since the PSU calculator gives me a load wattage result of 454W.
Going with an RM750x or even RM850x (5€ difference between them) is I think still a good choice, since the 450W load result is only a bit above the RX850m`s 50% load.

Reactions: NightHawkRMX