Lapping questions

[Orangey]

OK first of all to get it out the way, is it stupid to think I can use the sander attachment of my dremel (on lowest speed) to do the initial work?

And here's my problem: I just got a new CPU (rig in sig) and am sitting at 4.2GHz right now, trying to get up to 4.5 but I'm seeing core temps of 37 at idle WITH speedstep. CPU itself is only 24 right now. I used the sandwich bag trick to get a nice thin layer of TIM on the CPU but maybe too thin? The noctua cooler has seen a lot of action as I used it with my old e6420 for a while, is it safe to lap that too?

Do I need to lap? If so what website sells the sandpapers I need, a google for "sandpaper 1500 grit" only yields 1 ebay link in shopping search. Failing that can I get the type of grits you need at Robert Dyas etc?

Thanks.

 

[Orangey]

I'm gonna go buy the sandpaper in a bit, waiting on a delivery of a scythe 1900rpm fan.

Once I get back I will check it and do the job and post back with the results (if any).

 

[Orangey]

Just wasted almost 2 hours in the rubbish British high-streets, came home empty-handed. Will try and get to Halfords later.