If you need to do that again, maybe try turning the tREFI DRAM timing to the moon? That controls the refresh interval, which is very temperature sensitive. You

If you need to do that again, maybe try turning the tREFI DRAM timing to the moon? That controls the refresh interval, which is very temperature sensitive. You could configure a marginally stable setting, let it boot, start running `memtester`, and then apply hair dryer directly to DRAM.