Not sure if Mainboard will run with 13900k, it says „8+8“ core max support.. but the cpu has 8+16.. and i didn‘t find anything which confirms that combo works…
just some days ago, SM added official support for 13th gen. But as i mentioned they note explicit 8+8 cores
i had this combo also in mind.. since around 3 weeks, but at this time, there was no cpu support, which they added now…. But i struggle with that other „problem“