Don't bother with ECC for a Ryzen 5 5600X.

Not worth it. Just buy cheap non-ECC RAM.

ECC on consumer Ryzen is a weird gray area. The CPU supports it. The B550 chipset supports it. But motherboard manufacturers rarely validate it, and many boards will either refuse to boot with ECC sticks or just ignore the ECC part entirely.

Even if you find a combo that works, you’re paying more for slower RAM (most ECC sticks top out at 3200MHz, and often with looser timings). The 5600X is a gaming/workstation chip, not a server CPU. For anything you’d realistically do on a machine like that, bit flips are not a real problem.

If you had a Threadripper or an EPYC running 24/7 on a ZFS NAS handling critical data, sure. For a standard desktop build, you’re adding cost and hassle for zero practical benefit.

Just get the cheapest 3600 CL16 kit you can find and call it done.