I would like to know if I can move the disks from a V240 chassis into a V440 chassis to use the increased resources (CPU & Memory) to boost performance. I know you can move disks between V210/240 chassis's, but I'm not sure if this would work between 240s & 440s. Any help would be much appreciated.
Yes, it should work. If moving system drives you'll have to rebuild the OS, but as far as I can remember the systems use compatible SCSI types.
Thanks for your help seg
Definitely it'll work. In future, you can check on the part-numbers that are compatible for the relevant architectures. It will clear your doubts too 
Incredible, is there a link for where I find out about the part number compatability? Or is it somewhere on the Sun website.