I can't understand how is this possible:
If I use two 4GB memory kit-s (4 modules, 8GB total) as soon as I boot there are ext4 errors (missing files, mysql indicates InnoDB corruption, etc). It's Ubuntu 14.04.3 LTS 64 bit.
Still, memtest86+ does not show any errors (v4.2 or v5.01). I ran it for 5 hours, 3 passes.
If I replace a kit with a smaller one, or just use one kit, the ext4 errors disappear, machine runs flawlessly.
Probably related thing: with the two failing kits the machine can't even shut down properly, the fans start to run at maximum speed and the machine never stops. This also happens if booted from pendrive, so it's not a corrupted config file.
My question is: is there a way to use these to kits in a reliable way, or in fact the memory kits are incompatible, but memtest86+ isn't capable to detect that.
update: corrected memtest name to memtest86+
- The machine is a hp dc7900 ultra slim with 4 DDR2 memory slots.
- OS: Ubuntu 14.04.3 LTS 64 bit
- 1st kit: CSX 2x2GB 800 MHz, 2nd kit: Kingston kvr800d2n5k2/4g 2x2GB 800 MHz
These two kits separately work good, and even with other smaller kits or single modules. Only these two kits together produce the weird ext4 errors. But Memtest finds no problems.
I'm thinking that maybe the total of 8GB is the problem, not the memory modules themselfs. The maschine works with 4GB or 6GB just fine.