On the following configuration -Asus Sabertooth X79 -Intel Core i7 3930K -8 of these 8Gb RAM http://linux.about.com/od/commands/l/blcmdl8_ethtool.htm
One of these RAM is failing. When I plug it in and copy files from the network to a ramdisk (tmpfs) they get corrupted. I often get blue screens on win and kernel panics in linux. However, it passes memtest. If I copy from the ramdisk to the ramdisk, I do not data corruption either. The MB slot seems not to be the cause, since the problem does not depend on whether I plug it in. What could be the reason for the RAM to pass the test but be actually not working. What could be a way to better check that RAM?
--edit-- I tried putting another network controller, but the problem persists. I updated the BIOS to the last version, and use the default settings, the CPU is @3.2GHz When I use 6 out of 8 RAMs, if I replace the "suspected faulty" one with another one, it works