PC Master Race

You might be able to get by with the power supply but 750+ watts is recommended for a 3090. Any B550 motherboard should be totally fine.

For what it's worth I'm running a 5950X, 3090, a pair of water pumps, and 11 fans all off a 750 watt Corsair PSU and I've never experienced any instability or signs of an insufficient PSU.

If it were me in your situation, I'd just pick up a decent 750-800 watt PSU, and upgrade the memory to a decent 32 gig memory kit while I'm at it just to have a little better time. 3600mhz with decent timings seems to be the sweet spot. Otherwise, as long as the GPU fits the case, you should be in great shape to run it.

don't need to touch anything except the psu. the rest of your rig will keep up fine. that phanteks has official support for up to 340mm long cards without the hard drive cages (you will likely need to remove those), and the EVGA FTW3 3090's were 300mm cards on the dot.

absolutely the fucking do not try to run a hungry 3090 off a 550W CX supply. the infamous 30-series transients will trip that poor thing constantly. buy a 750w or ideally a 850-1000w fully modular unit from SeaSonic, Corsair, or EVGA.

The MAG B550 looks like it has PCI gen 4, so you would be good to run the card.

The power supply probably needs to be replaced though.

Motherboard is fine.

Corsair AXi 850w PSU is what you need.

Check out pcpartpicker.com.

You import your build (or even just a single part) and use their compatability filter to shop for other parts from a variety of suppliers. I'm not sure how accurate it is and there are some minor issues (had a liquid cooler not fit a motherboard but it wasn't flagged on the site) but for the most part the compatability filter is accurate.

You can also use it to make your ridiculous dream builds just for fun, plan out other upgrades, shop for the best price, and keep track of what your current build/build history is.

Assuming you have the right power connectors, don't exceed the max draw from the PSU, and that the card will fit, you can use a newer graphics card in the older PCIE slot. You'll take a performance hit for doing so. The major difference in slots is the bandwidth. You end up not being able to push enough data to the card to fully utilize it.

The PCIe standard is both backward and forward compatible between generations.

https://www.electronicshub.org/can-you-use-a-pcie-3-0-card-in-a-2-0-slot/

Sorry for off topic, but I just had a little panic.

1070

seven year old

Am I old?

The motherboard is fine, unless you want some of the overclocking features there’s really no need to go above the b550 chipset for a Ryzen 5xxxx series.

That CPU will be excellent paired with a 3090.

You will need more RAM. At least 16GB in a dual channel kit, though 32GB would be better. Going beyond that would be kind of pointless at this point.

The PSU you would definitely need to upgrade. You’d need a minimum of 750W, but going with a 1000W PSU would give you some headroom for future upgrades for a pretty minimal price increase.

Gpus are backwards compatible. You won't get the full speed with an old motherboard but it won't be worse than the old card.

The PSU is a valid concern. You probably want to upgrade to a 700w. As long as it is at least gold rates you will be fine with almost any brand.

The CPU itself is still powerful, so from my perspective there is no need to go all out on a new system, just a new PSU. If you don't hit 60 in your favorite games at your preferred resolution with your preferred graphics level, only then should you consider upgrading.

A B550 motherboard should have PCIE 4.0, which means your GPU upgrade is just drop-in. You should be good to go.

You are absolutely fine except for the power supply.

I’d recommend avoiding a seasonic as I had issues with their OCP on two of their power supply.

I like the Corsair AXi series. They allow you to adjust the OCP if needed.

Everything looks more than good except that PSU as others mentioned. 750 should be okay, I'd try to get 850 or 1000 if you can afford the extra amount.

The 3000 series is known for transient spikes that can trip OCP on power supplies that can deliver the needed wattage. Obviously don't cheap out on a no-name or low quality unit. 5900X is more than enough today, and you've got plenty of RAM. Motherboard I wouldn't consider a concern either, put that money into the PSU instead.