Hello
Long time fan of LTT and lurker on this forum, so sorry for this being my first post.
I have this weird issue with my RAM and can't figure out how to fix it, if it's even possible. Long story short, this is a 2 years old build, i7 8700K @ 49 Ghz all cores, 64 GB Corsair LPX 3000 Mhz (4X 16 GB), Asus Z370-E Gaming and some other non significant stuff for this specific issue. I used to run XMP 3000 Mhz profile on this setup without any issue. And I can't anymore. At some point 2 weeks ago I had to investigate a boot issue and in doing so I "played" with the DIMMS. At one point, one DIMM wasn't inserted correctly in the socket and I had POST failed on RAM test. I then pushed the DIMM all in, and it posted. At that moment I was running with default BIOS setting, no XMP, no OC (RAM speed on auto).
My initial problem being solved, I tried to go back to my OC profile, and the PC couldn't POST and failed the RAM test. I then went into some "intense" testing and came to the conclusion that:
Any RAM OC (i.e. over 2133 Mhz) will result in POST RAM failure with 4 DIMMs in (all 64 GB)
OC @ 3000 Mhz is possible with only 32 GB (2 DIMMs) in either banks, with whatever DIMM combination
So, it's not a specific socket
And it's not a specific DIMM
AND BTW I tried to push more voltage in (over 1.35), it didn't help.
So, I'm flabbergasted. I also tried to OC manually, didn't work. Same result. Anything over 2133 Mhz will result with a POST RAM failure.
@2133 Mhz the PC runs fine without any issue and is as stable as it was, but I'm bummed I can't run with my RAM at full speed, at least not with 64 GB (and I need the full 64 for work).
Any ideas on what could be the issue?
TIA