Originally Posted by Red1776
For whatever reason, even high end board manufacturers seem to use a lesser thermal compound or pad on the NB heatsink. Amonst the first things I do is to remove the heatsink (s) and apply a good TIM. close to always I get a 7-15c reduction in NB temps.
Part of the reason that the old (in this case you mentioned the Gigabyte 790 GX) NB's were not as warm as the new boards can be because now the VRM heatsink and the NB HS are linked via a heatpipe whereas they were not previously. Especially since so much of the NB functionality has been moved on die.
Both Gigabyte and Asus have said that 85c is within the thermal operating limits of the NB. without a fan mine will run as high as 46c and that feels damn hot to the touch. but nowhere near being a problem.
I appreciate the background, Red, but that's not my old board. In fact, it's this one:
As you can see, it DOES have the heat pipe connecting the VRM heatsinks with the NB heatsink, and that's actually why I think it runs cooler. It' BECAUSE the heatpipe transfers heat away from the NB to the VRM heatsink that it runs cooler. That's the setup the UD5 uses, and your UD7 even connects the southbridge to the NB and VRM heatsinks for the same reason. The dumb idea was to keep the NB on the UD3 isolated. There's no way to conduct the heat building up anywhere else, except into the air, which is a very poor conductor of heat, as we all know. Maybe I should take the heat sinks/pipe off of my old UDP4 board and retrofit it onto the UD3...