I have a 5600H (not exactly the same as regular 5600) with 32GB of 3200MHz RAM, running Linux for ~18 months, no problem with it, stable, suspend/resume always works, etc

For me a 5600 in a B4500 board works perfecly.

I have a 5900x (zen3), and apparently I got a bit unlucky with the silicon and ended up with a CPU that's slightly unstable at its stock voltages and stock boost clock. The system would freeze and reboot randomly, and the bios would report an MCE error. This crash could be reproduced with near 100% success by doing sha1 hashing specifically for some odd reason. This is not a Linux issue, it's a hardware defect.

It may be an Asus motherboard specific thing, but I found a workaround by going to the bios settings, precision boost overdrive, and increasing the voltage scalar to like 7. Now it's been two years and I have only ever had it happen once since I changed that, so I'm happy.

I had a 5600x on a b450 board with Kingston pc3600 too. I had no problems running xmp profiles and optimized defaults. If cool & quiet was enabled by default then I didn't mess with it.

I rarely use suspend or hibernate, and I don't encrypt my drives, so I can't speak to those issues. But even though you say you don't need the speed, I think you'll be very pleased with this upgrade if you go through with it.

did the upgrade! aside from a little scare* everything worked out beautifully! it sleeps and wakes without issues and the XMP1-3600 profile works. ran a bit of geekbench6, that used to crash on the old CPU - no such thing here; watching the clock speeds reach 4.4 GHz was surreal.

a bunch of new options in the setup, PBO, overclock, etc. I'll leave them be for now.

also, just checked, I don't have the amd-pstate driver active, I'm still on acpi-cpufreq. I'll tackle that one of these days if everything works fine.

• • on first power on, there was only the "American Megatrends" logo and no other text, it just stood there. after a quick ddg, found the solution in a reddit thread, you're supposed to press "Y" there and then commences a series of reboots (5-6 or so, didn't count). after that's done with, you're greeted with your normal POST screen. enter the setup, load "Optimized Defaults", activate XMP1, turn off extraneous devices (serial, SATA ports).

what distro are you using?