I recently bought a used 1240 v2 but can't get it to work properly in my Microserver Gen8.
It POSTs fine, but 9/10 times fails to boot FreeNAS (returning "panic: unrecoverable machine check exception" followed by some seemingly CPU-related error messages), and the one time it managed to boot it crashed from the slightest load.
When I run Memtest with the 1240 v2 in it, it constantly reboots at test #6 "Block move".
With a 1265L v2 in it it runs flawlessly - FreeNAS boots without an issue and there are no errors in Memtest.
I contacted the seller believing the CPU was faulty, then he told me that he had the same issue getting in to work in his Microserver Gen8, and that the solution was to use another PSU.
I haven't gotten around to try another PSU yet, but I find it a bit weird that the PSU would be the issue, because surely 13A @ 12V (156W) should be enough to power a 69W TPD processor.
I even tried disconnecting all the drives to leave as much power to the CPU as possible, to no avail...
And on top of that I've seen loads of posts from people having upgraded to 1230s, 1240s and even 1270s with no mentions of upgrading the PSU.
I'm running the lastest BIOS (2018.05.21) along with upgraded cooling (Akasa K25), so those shouldn't be the reason either.
Has anyone ever heard of this before?