Heat spreading through pcb Insulating question.
 

Hi, I just built a peltier cooler for my new 9600xt that cools both the gpu and the same side ram, I have insulated the cold plate very well and I will almost be able to just use it the way I have without any conformal coating or silicone because of the way I designed it.
My question is how far will the heat spread(lack of heat) through the card? how far and how much will I have to insulate on the back side?

I am planning on trying to run this at 5v and see if it will cool it just enough before I make a plunge to full 12v then maybe a 172@12v later if I keep the setup.
Heres a few quick shots.

http://jfettig.wc101.com/gfxpelt/1.jpg
http://jfettig.wc101.com/gfxpelt/2.jpg

I made it out of aluminum because thats all I have at hand at the moment, and I am not too worried about the semi-small performance decrease at the moment.

Jon

I think it will largly depend on the load of the GPU. If it is idle then it maybe be a problem, if at load you may not be. Being it is doubtful you will be running the card full load 24/7 it maybe a good idea to insulate it. Assuming the pelt isn't temp controled anyway...

Well, its up and running, it spreads through the pcb to the backside ram pretty good, but not too far other than that, I got it up to 610/355 so far.

Jon