Hi folks,
 
Hoping someone has advice for a RAM problem with the X99. When I originally built the system, I installed 4x16 Corsair Vengence LED 64GB DDR4 3000MHz.
 
Everything was fine for about a year, until the system got trapped in a reboot cycle - continual reboots, never made it to the BIOS screen. I discovered that everything would work IF I took out 2 of the 4 RAM and left the remaining 2 RAM in position 1 and 2 on the motherboard. Assuming that the other two RAM boards were at fault, I just removed them. 
 
Fast forward a year, and in the past few days performance has become very erratic with a ton of hard crashes. Suspecting the RAM again, I do a little of trial and error and discover that:

1. EITHER of the two remaining RAM units works correctly in position 1 or 3 - verified by Windows Memory Diagnostic - and the system boots and runs correctly. So both RAM are, apparently fine.
2. Putting the two RAM in position 1 and 2 leads to very slow performance / tons of crashes.
3. Putting one RAM in position 1 OR 3 and the other RAM in ANY of the other positions - 2,4,5,6,7,8 - and the system won't boot and gets stuck in and endless restart cycle - the same problem I previously had with 4 RAM installed.

So now I'm in the position where I know the problem but not the solution - clearly, running with only 16GB of RAM is not viable. Any thoughts?
 
Thank you!

hi, the problem is: socket 1 and 2 work good; but if i installed memory in slot 1 and 3 nothing. 2 and 4 noting; 4 module nothing, please can you help me?