Out of curiosity, what speed were you trying to boot at? I had an issue getting 4 sticks to run at 3600 MHz 1:1. I got it running at 3200 but this wasnt because of finicky ram it was because memory controller couldn't handle 4 sticks at that high a speed. In hindsight this was even hardcoded into the bios as it tried to set FCLK at 1600 with 4 sticks when the XMP profile was loaded (3600), with only 2 sticks it auto loaded 1800 FCLK.
It's Kingston DDR4-2666 (8x4) and I was just trying to run as is. I'm in the Philippines and limited in what I could get my hands on. No boot with 4 slots filled. I could only boot with 2 slots filled. I had to do 2 things. I set the RAM to 2400 and I ran CPUZ, took down the timings from the SPD tab and then set the lowest common manually in the BIOS. I'm now able to boot normally most of the time and the system is solid. Occasionally the system won't POST, but a restart solves that.
That's still well below the 4-slot JEDEC max on Ryzen 3000 (2933Mhz), you should definitely be able to boot with that combination. Sounds like either faulty RAM or a bad memory controller, I would try to RMA the RAM or the CPU.
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