DDR4 3200MHz CL34 or DDR4 3600MHz CL18 compatible with an i9-9900K at stock settings
DDR4 3200MHz CL34 or DDR4 3600MHz CL18 compatible with an i9-9900K at stock settings
If costs match, I’d pick the 3600MHz model, but either option should work just fine.
I try 4000MHz on Intel with XMP settings. The performance is excellent, timing changes aren’t noticeable at this speed unless you’re aiming for top results in tests.
3200MHz likely means B-die, while 3600MHz could be almost anything.