I've been using a Corsair TX650M (CP-9020132-EU), rated at 650W and 80+ Gold, with no issues so far. My system has a Ryzen 7 5800X3D tuned to -30 on all cores through PBO, a Thermalright Phantom Spirit 120 cooler, and a Radeon RX 7900 XT. The CPU usually stays under about 80W while gaming, and the GPU typically draws 200–250W in my main game, though it can reach around 305W in demanding workloads. The graphics card is connected with two separate PCIe power cables rather than a daisy-chained cable. AMD recommends a 750W PSU for this GPU, and my power supply is now roughly six years old. Should I keep using it, replace it with something like a 1000W unit for extra headroom, or only upgrade when I move to more power-hungry hardware?
5 Answers
Your current PSU should be fine for this setup. Even with the GPU reaching around 300W, the CPU and rest of the system should leave a reasonable amount of room below 650W. Using two separate PCIe cables is also the right way to power the card.
There’s no urgent reason to replace it if the system is stable. Watch for symptoms such as black screens, driver timeouts, unexpected shutdowns, or reboots under heavy load, since those can indicate that the PSU is struggling. If you later buy a significantly more power-hungry GPU, choose a modern ATX 3.x PSU with plenty of capacity and the appropriate newer power connector.
Check the warranty period for your exact PSU, since this model appears to have a seven-year warranty. You could continue using it through that period and then replace it or keep it as a backup. Six years of age is worth keeping in mind, but age alone doesn’t mean it is immediately unsafe.
I’ll probably keep using it for now and revisit the decision when the warranty ends or when I upgrade the graphics card.
A 650W supply has worked for other systems with a tuned Ryzen processor and a higher-draw graphics card, although that isn’t a guarantee for every build. Your separate PCIe cables and relatively efficient CPU make your situation more favorable. Avoid increasing the GPU power limit unless you have a larger PSU with more headroom.
The TX650M was a good-quality unit, and its rated capacity is probably sufficient as long as the GPU is running at stock power limits. I wouldn’t rush into buying a 1000W PSU solely because the card’s recommendation says 750W; wait for a good deal if you eventually decide to replace it.
I’m not planning to move to a much more powerful GPU soon, so waiting for a worthwhile upgrade or sale seems reasonable.
That makes sense based on the normal power draw. My main concern was whether brief GPU power spikes could change the situation.