We have a few DELL 1950 servers. One of those servers has CentOS6.3 and it's randomly rebooting, so I suspected it was hardware (no log generated). The other four servers do not randomly reboot.
We ran memtest86+ on the five servers and on three of them memtest86+ crashes (displaying an odd and colorful screen, like if a video card failed).
I tested an old memtest86 (not +) and none of the servers crashed. I also tested other RAM testing utilities, with no tool failing.
Have any of you guys experience this?