Server freezes without kernel panic

This might be a CPU bug. Intel published an errata about this problem and they also provide a microcode update for the E5 v3/v4 CPUs (datecode 20170707). CentOS 7.4 already has a newer microcode version 0xb000021 (in CentOS 7.3 it was 0xb00001e). It may help to exchange the microcode or upgrade to 7.4. I also had a lot of trouble with this system freezes. I exchanged the mainboard (X10DRi), RAM, CPU and powersupply without success. I can't say for sure if this is the solution, because I do not have enough uptime since I updated the microcode. Supermicro still does not provide an updated BIOS with the current Intel microcode. You may get an unofficial prerelease from your distributor for the X10DRI.