[SOLVED] RTX 3080 on 650W

[Leplivo]

Hello, I have been saving money to get a 3070 but because 3080 is not that more expensive I have been wondering if my 650W PSU can handle it. My PC specs:
R9 3900X
GTX 1050Ti
GB X570 Aorus Elite
16Gb 3200Mhz
2Tb Seagate BarraCuda
250Gb MX500 Crucial
EVGA 650W G5 SuperNova

 

[Dj0gany]

Not the best EVGA's psu but i think it will do.
In gaming a 3080 can eat up to 400W so you will be left with very little headroom,especially if you overclock CPU/GPU.
If you can,return the G5 and grab a GS 850W or something with more wattage than 650W.
If you find something else make sure to come back here and check if its ok.

 

[Phaaze88]

I can't find a review of the 650w specifically, but if it were ok - it usually isn't - to use these reviews of the 750 and 1000w models:
https://www.tomshardware.com/reviews/evga-supernova-1000-g5-power-supply,6337.html

https://www.tomshardware.com/reviews/evga-supernova-750-g5-power-supply,6344.html

Both got flagged for poor transient response; one of the greatest flaws with Ampere has been its high transient power spikes, so I doubt the 650w version is any better.

 

[sizzling]

I’m using a 3080 and 3700x with a 650w Seasonic Prime Ultra Platinum without any issues.

 

[sizzling]

Both got flagged for poor transient response; one of the greatest flaws with Ampere has been its high transient power spikes, so I doubt the 650w version is any better.

That is very true, even some higher quality PSU’s with only average transient response performance have issues with the 3080 & 3090 even if a higher wattage. Seen many issues reported with the RM850 for example.

 

[Karadjgne]

Figure the cpu will eat up 150w stock PBO.
The motherboard, drives and everything else will eat up 50-100w.

Thats roughly 250w spoken for. Add in upto 400w for a maxed out 3080 and you are really pushing the limits. Gaming tends to run @ 70% psu loading, so generally you'll be gaming @ 400w, but the spikes are what's going to hit hard and push that 650w limit.

It's doable, barely, but definitely not advised to run a 3080 on 650w, even a decent model.

But right now, if you can actually Get a 3080 for a decent price, and not get scalped or have to wait for months, then an upgraded wattage psu is a minimal expenditure.

 

[Dj0gany]

You can maybe get away a bit by undervolting the card,but you will lose some performance,until you can afford a better psu.

 

[HWOC]

If you can get a 3080 at a decent price, just get it! Worry about changing the PSU later. I mean, if you have to buy a new PSU and sell the old one, the difference is probably going to be less than 50 bucks anyway.