On Sat, Mar 14, 2009 at 4:43 AM, pdimage <[email protected]> wrote:
> > On 14/3/09 02:32, "Wallace Adrian D'Alessio" <[email protected]> > wrote: > > > Overclockers who are set on defeating heat to preserve costly CPUs yet > squeeze > > extreme clock counts out of them have been known to polish the CPU and > > heatsink with ever finer grades of wet or dry paper starting with 1000 > grit. > > And even going to finer grits of polishing compound. Some may even " lap > : the > > surfaces together with a polishing compound. > > > > Then they apply the thermal paste after all of that. > > > > In theory the more closely the parts surfaces match and the thinner the > paste > > needed to > > make up the difference the faster and therefore the more successful the > heat > > transfer will be. > > > > Seems strange - the laws of physics would suggest that a coarse finish > - > rather than a polished surface - would provide a much greater surface area > for a face to face contact - with the compound filling the pits in the > coarse finish... > I agree about surface area. Like cooling fins on a motor. However the idea here is conduction. And the closer the fit the less resistance there will be to conduction. ( I think ) For sure the finer the tolerance the thinner the layer of paste can be.And fewer minuscule air pockets which would transfer heat by radiation. I do not know if the coefficient of transfer for the paste is less than that for an air pocket. But would presume the paste is more efficient for transfer than an air pocket. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed Low End Mac's G3-5 List, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/g3-5-list?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
