It has ran 4 passes of MemTest86+ without any failures, however...
When I first installed the Tracer RAM I noticed the LED's on one strip seemed lazy compared to the others, it was originally installed DDR2_2 so I moved it to DDR2_1 to see if it was the socket or the RAM, it is the RAM as it is still lazy regardless what socket I try it in. I also noticed it was much hotter than the other sticks.
It is the bottom stick in this video...
I have chatted to Crucial about this and they said they will replace it as they should all behave in a similar pattern which confirms what I thought.
I don't think this is my other problem though, just that I am glad this has been highlighted and the "Diagnostic" (
) LED's are worth it!