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7900XT and 750w PSU

McVoxy

McVoxy

McVoxy

Associate
Joined
4 Jan 2010
Posts
28
Location
Scotland
Good evening People

I have just upgraded from an nVidia 3070 FE to a Gigabyte AMD Radeon 7900XT, and I am wondering if I should have upgraded my Corsair 750 watt PSU too? The system seems to run fine, and I have yet to have any problems, but I am seriously wondering if I have gone too far with the power requirements of my system now?
Any thought's and insights would be appreciated!

Regards, Ian
 
Yeah, should be good. I have a 7900XT Pulse running for over a year on a 650w EVGA PSU. 5800X3D CPU on X570 motherboard and 32GB RAM. Never had an issue with it.
 
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I have a 7900xt with a 750w and never had any issues. The max draw I've seen from the card is around 400w so should be plenty left for everything else.
 
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You should be fine with that. Remember you are probably only going to hit high peak power in artificial circumstances i.e prime 95'ing your CPU with an overclock and furmarking your GPU with an overclock at the same time with increased power limits. Playing games won't push you to the theoretical maximum of your PC's total power draw.
 
use this to determine how much power draw would be typically used for your setup.

outervision.com

Power Supply Calculator - PSU Calculator | OuterVision

Power Supply Calculator - Select computer parts and our online PSU calculator will calculate the required power supply wattage and amperage for your PC.
outervision.com outervision.com

I run my rig (in signature) on a 750w no issues.

I'm also contemplating whether to upgrade once the new CPU land, but even then the 750w should be suffient
 
I have a 7900XT and a 7800X3D with an AIO and 32GB VRAM on a B650 board. It runs perfectly well on a 650w Gold PSU.
 
should be alright according to psu calculators ! and those usualyl say you need more than you do :)

i bet it will be something like 550w at the wall in gaming for the entire computer, maybe less

a wall monitor plug might be useful !
 
80W according to the specs on TPU (220 vs 300):

www.techpowerup.com

NVIDIA GeForce RTX 3070 Founders Edition Specs

NVIDIA GA104, 1725 MHz, 5888 Cores, 184 TMUs, 96 ROPs, 8192 MB GDDR6, 1750 MHz, 256 bit
www.techpowerup.com www.techpowerup.com
www.techpowerup.com

AMD Radeon RX 7900 XT Specs

AMD Navi 31, 2394 MHz, 5376 Cores, 336 TMUs, 192 ROPs, 20480 MB GDDR6, 2500 MHz, 320 bit
www.techpowerup.com www.techpowerup.com

That said, they do state a 700W recommendation for the 7900XT.... but I've seen mine pull a reported 500W board power on occasion!
Either way though, with a 5800X I think 750W would be fine, and with a bit of tuning you can definitely clamp down the XT power use without sacrificing much/any performance.
 
Personally I like to plan ahead. I know some people just get the PSU that'll do the job, but for me I go further because if you think a PSU is going to last you at least 10 years. You don't know what GPU or CPU or other thing you might upgrade to in that time. Why stick with the minimum? But hey, that's just me. :) I saw a reddit post where they make mention of transient spikes and they said, "Gamer's Nexus' video on the 7900 XT/XTX showed it can spike up to 196% of its rated TDP, so up to 700W for <5ms." That's probably the most important take away here, because those transient spikes can knock your PSU off. So you should account for those, and give your PSU headroom for efficiency and heat. I wouldn't go 750w but that is just me. :)
 
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