I already installed it, but I haven't try to OC the Infinity Fabric yet. Sigh......

Maybe next week? Cause uncle needs to work on weekdays. 
Need to ensure system stability for work related stuff.

AGESA 1.2.0.0 doesn't seem to make any difference to my Infinity Fabric OC, still limited to 1866Mhz. 
Speaking of which, which batch is your 5900x?
My 5950x batch is 2046 = year 2020 week 46.

Every time I drop by this ryzen thread sure got some performance haggle issues reported (I havent even drop in OCN even)

It seems that this ryzen zen 3 is only good on paper, and also a straw launch. (not even paper launch, at least RTX 3080 and 3090s comes every 2 weeks or so)
Without a minimum of DDR4 3200 CL14 or DDR4 3600 CL16, I dont know if 5900x can beat i9 10900K. If theres something to learn, its that AMD are shills. And youtubers words cannot pakai wan if you buy a PC to game more than anything else - they run it on High end motherboards, under a controlled setting, maybe also paid reviews some of them.

U are not going to run cinebench, prime 95 all day long, certainly 80% gamers are casual group, also do not overclock like those youtubers do.
U buy the PC to instruct it to game lar. And instruct the CPU, I want you sit at this X Ghz all day long because this is the money I invested on you. 
Until now many of u are still running benchmarks to see whether the zen 3 stable ka, temperature ok ka, voltage ok ka. 2 months + already, waiting for AGESA updates (stability stability stability every update is it even a stability update why every time call it stability update)

Finally good luck playing the bsod roulette.