Prices are CDN$. Got my x370 Crosshair Vi Extreme on Black Friday '18 with the expectation I could swap in a Ryzen 3000 chip in the coming year, that plan finally came to fruition but not without some quibbles.
Everything's running beautifully now, my ram finally reaches their advertised speeds, the system is rock solid stable while playing games and running tasks in the background and while staying very silent with 'quiet' presets applied to all fans, thermals won't go above 80º with either GPU or CPU.
I've detailed the process of getting the board up and running with the first (and buggy) Asus 3000 series bios if anyone else is thinking of following along:
After flashing bios 7106 and swapping CPU's I run into my first error, Q-Code 07- The motherboard won't boot to bios, nothing on the screen appears, no power to keyboard.
Re-flashing bios with flashback didn't work, leaving the CMOS battery out for 4 hours did nothing (had to pull away for a prior engagement which killed me).
The fix- Take out all of the Ram modules except the one in the 2nd Dimm slot. I booted into windows then immediately restarted into bios to tinker.
From bios, voltage settings all seemed normal, nothing like the Jayz2Cents x570 Hero vid that showed everything way over-volted. So I went ahead and applied a negative voltage offset of .075, set the one ram to it's 3600 MHz D.O.C.P setting, it's voltage to 1.4 and it's boot voltage to 1.4. Flck timing to 1800 MHz and left everything else. Booted fine. (I've since gone back and turned voltage to auto, 3º increase in temps but my Cinebench R20 score jumped 100 pts).
Now to add the ram and the 2nd problem... After powering off the PC and switching off from the PSU I installed the 2nd ram stick into Dimm #4. Powered on to find Q-Code C5. Reading online I see a lot of recommendations to clear CMOS or re-flash the bios. No, the fix for now until the bios is updated is to hit the reset button on the motherboard itself, it once took me 5 times and on 4 occasions took me once but the board will cycle out of it. Hitting the power button on the case wasn't helping so it is a pain to access the mobo button, atleast for me with a tempered glass panel w/ 4 screws. My solution has been repeatable and I will be making sure the CPU doesn't have it's power cut in the interim, barring a crash.
So I just plugged in the other two sticks from there and mashed the reset button.
Now everything's working fine, running Cinebench R20 gives me a score over 7120 each time (remember no performance enhancer or pbo applied yet) with a max temp of 79C. During the run the all-core clock fell to 4025 but it's been settling in around 4325MHz otherwise. I see the max boost clock has hit 4625 on a couple of cores on a few occasions.