The RTX 3090 is Nvidia’s flagship graphics card, but it’s not one that will fare well with an ancient or underpowered power supply unit (PSU). An under-equipped PSU can lead to crashes and overall system instability, so if you’re investing a grand in new hardware you don’t want to skimp elsewhere. NVIDIA recommends a 750W PSU for the RTX 3090, which is why we’ve focused on that category for this collection.
The best power supply for 3090 is the EVGA Supernova P2 850 G7, which has a high enough wattage rating to meet the GPU’s power requirements and even overshoots it a bit to ensure stability. It also features a high 80 Plus Platinum efficiency rating and a 10-year warranty, which are both great bonuses. It’s fully modular too, which helps cut down on excess cables in your case.
If the EVGA SuperNOVA P2 850 G7 is too expensive for you, then check out the MasterWatt 750. It costs less, but doesn’t have as high an 80 Plus Platinum efficiency rating. It still hits Nvidia’s recommended wattage and is fully modular to help keep your case clean. It’s also got a short five-year warranty, but it’s still a good deal for those on a tight budget. Prosumers planning on pairing their RTX 3090 with a Threadripper processor should aim even higher, however. A 1000W PSU is a safe bet for this type of scenario. Just be sure to choose an ATX 3.0- and PCIe 5.0-compatible model.