Really? Christ - so it's definitely not worth cooling the NB with water then? I have a pretty good HSF on mine now, so maybe I'll just leave the DD Z block as it's supposed to seriously inhibit flow. That's great, thanks a lot mate! Will make things cheaper for me.
A bit of bad news - the shop I was buying from shutdown. I can get it all elsewhere for a little more but the MCP600 - gonna have to import it from the US as there is officially nowhere to get it in the UK anymore :/ I asked Swiftech and they forwarded me to
http://www.sidewindercomputers.com.