ASRock B650M-HDV/M.2 RAM Issue with R& 8700G

Hello Everyone - Need some Help.
I just built a system with Ryzen 7 8700G APU & ASRock B650M-HDV/M.2 motherboard.
Using GSkill Flare X5 64GB (2 x 32GB) DDR5-6000 PC5-48000 CL30 that I swapped out from my previous build, that includes Ryzen 9 7900 CPU & ASRock B650I Lightning WiFi Mini-ITX Motherboard.

In the 8700G build I'm having all kinds of issues booting with this same RAM. I have no issues booting when using the RAM at the default DDR5-4800.
It had no issues at all in the 7900 build. In that build I just set the BIOS to EXPO DDR5-6000 & off I went.
In the 8700G build, I've tried:

- booting with EXPO set to DDR5-6000, no other UEFI changes > no boot
- booting with no EXPO, DDR5-6000 manually set with all other settings set same as EXPO > no boot
- booting with RAM manually set to DDR5-5800 or DDR5-5600 at 1.4V > no boot
- all of the above with RAM training set to either enable & disabled
- all of the above plus adjusting timings to more relaxed settings from default 30 & 40 at EXPO to 35 & 45

Is there some magic setting in order to get the 8700G to boot at DDR5-6000 or anything close to that or is it's memory controller just total garbage?

I didn't buy the 8700G to use with stock DDR5-4800 RAM settings. Should I just return it & go back to the 7900? I'd like to have the integrated graphics of the 8700G & avoid a dedicated GPU.

Appreciate any help / suggestions to try.

Thanks.

I have the same motherboard, though a ryzen 7600 and 2x16 6000 CL36 RAM. Very recent BIOS but not the absolute most recent (I think the next stable BIOS before.) I'm also having problems getting it to consistently clear POST at higher than stock frequencies. Just gonna post some of my experiences and my own ideas to try.

Also, I had been having a Win10 corruption issue, which I now resolved. That contaminated some of my testing, and I basically have to throw out any issues I had freezing and crashing in Windows. But my experience was this -- anything that cleared POST, I could run HOURS of memtest86 with zero errors. However, whenever I'd restart, POST would eventually give me the 3-beep memory error, and reset me again at the same stupid JEDEC 4800 default.

Looking on the forums, I saw that someone was trying to adjust settings in the BIOS regarding the DDR5 ram training during POST. I don't know if that would fix your particular issue, but it's something. Really not happy with this motherboard or with DDR5 in general. Feels like I'm paying to beta test someone's flawed product. Would rather have DDR4 than this nightmare.