Corsair RM850e 2025 is the best choice.

For ITX builds, the Corsair SF850 is your best bet - it's SFX format with Platinum efficiency. You get options for both 12V-2x6 or up to 3x PCIe 8-pin connectors depending on which 9070 XT variant you choose.

The good news is AMD stuck with 8-pin connectors for most cards, so you don't have to worry about the new 12VHPWR cables like with Nvidia.

Honestly, while everyone is talking about wattage, as a DIYer you really need to look at the transient response and ATX 3.1 compliance if you want this build to last. Moving from a 650W unit to a higher tier isnt just about the number on the box, it is about handling those millisecond power spikes that high-end silicon like the 9070 XT throws at the 12V rail.

• Never reuse modular cables from your old 650W unit even if they look like they fit because pinouts are almost never standardized across different platforms
• Avoid using pigtail or daisy-chained PCIe cables for a card with this much draw since it can cause connector meltdowns or voltage drops
• Make sure your chassis has enough clearance for the newer, stiffer cables if your specific card variant uses the updated ATX standards If you are doing the swap yourself, just double check the rail distribution. Most modern enthusiast units are single rail which is easier to manage, but if you go multi-rail you have to balance the load across the OCP groups or you will get random shut downs during heavy gaming loads. Worth doing it right the first time tho.

AMD says 750W for the 9070 XT, which is way more reasonable than Nvidia's power-hungry cards. The CX750M with Bronze rating will do the job just fine if you want to save some cash - it has 4x PCIe 8-pin connectors, though you'd need an optional cable for 12V-2x6.

Honestly, if you're upgrading from something like a 7900 XTX, you probably don't need a new PSU since the power requirements match.

Did this last week, worked perfectly

Lol I was literally about to post the same thing. Glad someone else brought it up.