coreboot_ram
mchbar_dumps contains dumps from both coreboot and 1vyrain/stock bios 1600/1866/2133
usb_debug_logs contains logs from ram init/boot with both 1 dimm and 2 dimms attached at 1600/1866/2133
and the issue itself is general unstability and memory errors in memtest86 when going to either 1866 or 2133 in coreboot