Hi just trying to diagnose why my laptop occasionally freezes and requires a hard restart. I have changed HDD so its not that but noticed it would tend to freeze when the RAM usage was at over 2 3rds. Looking at the RAM there are 2 sticks one 2gb one 4gb both different makes with different timings. Would this be causing the crashes?
Probably. They'll both run at the same speed and timings, so one or both sticks could be throwing out errors.
I'd buy a new 4gb stick with the same timings as the 4gb stick to replace the 2gb.
OK but would it be worth buying 2 new 4gb sticks as it wouldn't work out much more?
Up to you. I'd save the money. If you do get just the single stick, make sure that it has the exact same timings and runs at the same voltage.