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#21
Ah, forgot you had an HP. That limits things a bit. Timings look good, so it probably is not that causing the problems. Can't change BIOS settings for the voltages. That leaves you with replacing the RAM if it is the problem, or finding other culprits.
Have you ever physically touched the RAM? Minor static damage is typically the cause of RAM failure that does not show itself until some time has passed. Further reading: Avoid Static Damage to Your PC
The above is for informational purposes and is not because I think you did anything to damage the system.