I've been using an 850W power supply since October 2022 to leave room for future upgrades. After a recent system upgrade, my current build is a Ryzen 7 9800X3D, RTX 5070, 32GB of DDR5-6000 memory, two PCIe 3.0 NVMe SSDs, one 2.5-inch SSD, and one 3.5-inch 7200 RPM hard drive. My current PSU has started making noticeable buzzing or coil-whine noises, and it doesn't include a native 12VHPWR/12V-2x6 cable. I'm considering replacing it with an ADATA XPG Core Reactor II ATX 4.1 unit. The estimated system draw is around 550W, so would a good 750W model provide enough headroom, or is it worth staying with 850W?
4 Answers
A quality 650W ATX 3.1 unit should technically handle that system, so 750W gives you a comfortable amount of headroom. The calculator estimate is only a guide, though, so make sure you choose a reputable model rather than focusing only on the wattage number.
Check the PSU’s quality and protections using a reputable tier list, not just the advertised wattage. Coil whine can sometimes come from the graphics card or unstable power from the wall, so a replacement PSU may not completely eliminate the noise. If buzzing continues, a good UPS may help, but 750W is already sufficient for this hardware.
The RTX 5070 isn’t especially power-hungry, so a 750W supply should run this build without trouble. If your existing 850W unit is otherwise good, you could also keep using it with the proper PCIe adapter instead of replacing it solely for a native 12VHPWR cable. Since yours is buzzing and is a Gigabyte P-GM model, replacing it with a higher-quality unit is still reasonable.
I’d stick with a good 850W supply if the price difference is small. It gives you more room for future upgrades and possible overclocking, while avoiding any reason to downgrade. The native modern GPU power cable is a nice convenience, but it isn’t by itself a strong reason to replace a reliable PSU.
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