Right well I tested each stick seperately for a short while. Left all the bios settings on Auto.
Stick 1: After 5minutes, 62 errors. I'd seen enough.
Stick 2: After 5minutes, 106 errors. I'd seen enough.
Stick 3. After 30minutes (1 pass), 0 errors.
Stick 4: After 30minutes (1 pass), 0 errors.
I think that I may put stick 3 and 4 in together next and leave it for a few hours.