Yeah, i'm going to email Crucial today explaining that this is the second time i have had to RMA it and i want it replacing with the double sided stuff.
The thing with the mobo is that i have been having some major problems with it, and 4 sticks of memory dying all at once seems more than just an over heating problem to me. I've not got any spare memory to use while the Crucial stuff is RMAed anyway, so it's no more of an inconvenience to RMA the mobo at the same time, even if it comes back as being fine atleast i know then.