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this post was submitted on 25 Dec 2023
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PC Master Race
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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.
Glad to see that the MoBo and CPU should pair without fault for the 3090. Truthfully I haven't refreshed myself on hardware jargon since I built my PC around 2018.
That was a complete typo on my part, I meant to put x4 8GB for 32GB total.
PSU was expected, upgrading to a GPU that maxes 350W on its own. Will probably be looking into a 1000W unit on your recommendation, just for future proofing
As an additional note, if you’re comfortable doing so, I’d recommend going into the BIOS and undervolting the CPU down to 1.2 or 1.3 volts.
A common issue with the higher end Ryzen 5xxx CPUs is that they run a bit hot which prevents them from boosting clock speeds as high for as long as they’re able.
My last build very similar to yours, (3090, 5900x, 32GB RAM) and I was able to shave almost 10C off of the CPU temps by setting a CPU voltage offset of -0.15 volts.