news on my koolance block:
- Dean and koolance had great support and send a new block for me to try. Remember I'm in Brazil. Thanks Dean!

- the new version, the 5850/5870 block, looks the same with just 2 little differences on the corner (sorry, no pics). Now it includes 2 types of thermal pads: the gray and thinner one (old koolance blocks used to came with it). It is frangible and harder to apply. And the white/pink one, thicker and easier to apply.

I tried the thinner one first. Temperatures were terrible at the VDDC chips, they went to 80º and higher at first test.
My second try was with the white/pink but I cut little pieces of the pad and applied directly to the chips on the card, instead of cut a large piece and apply it to block. Temperatures now are much better. It seems that the chips are in contact with the block. VDDC temperatures under furmark are on the 70sº. Under game are 60º tops. They seem to be in touch because when I crank up the speed on my SanAces fans the temperatures get 4º lower.
Core temperatures stays under 50º all the time. The card didn't throttle, even under furmark. Frequencies were 900 Core and 1300 memory.

I can't compare the temperatures with Gabe's block since my card reaches 60A load under furmark and his stays on the 50A, even with a higher voltage.