Untill otherwise experience is reported, ill take this as good advise mate , cheers

I have a Accelero Xtreme Plus (similar cooler) on my 6950 1GB (similar PCB to 6850) on my bedroom computer. Had to re-set the heatsink 4 times or so not due to any mounting difficulty with the HSF portion, but to changes and interference with other heatsinks (ramsinks, vrmsinks) on the board.

I've OCed it a bit, but can't get much farther than stock because the VRMs get way too hot. It runs about 15c cooler (at 860mhz core) than the stock cooler (at 836mhz core), but it is way quieter - fades into the background. The stock VRM cooler, which isn't integrated into the HSF like it is on the 2GB models, would get VRMs up to 120C and higher at stock clocks and voltages with OCCT. Replaced with the alu ones that came in the VR001 kit and now, with power threshold set to 10% above, at OCed settings, VRM temps top around 100c.(*) Core tops around 70c at the hottest part of the day, as opposed to 85c with the stock cooler.

Probably not worth the money unless the rig is physically near you so you have to hear it.

(*) VRM temps may not be reported accurately.

I was looking at these yesterday for my two 5970's. Do they take up three slots? It says on the site they are crossfire compatible, so surely it's only two slots?

Anyway I decided to look into water cooling options instead, the risk of the card dying because of the bent PCB issues is was too high. In reviews the GPU core temp is lower, sound is a lot quieter but the VRM's are actually hotted than stock cooling. It's the VRM's which make the cards unstable, so it's these that need the most cooling and the Accellero doesn't do it well enough.

Your voltage is way to high btw. I have a 900Mhz overclock on 1.136v, however my pc is in front of an open window with a large desk fan blowing the cold air right into the case (Side panel taken off). Doing them dropped all the temps on the 5970 by 20c which is how I have a 900Mhz overclock. 1.28v is just way to high though.

Don't the full blocks from EKG cover the VRM's? I've never seen someone with additional blocks on with these and they can ramp their cores right up to 1Ghz with ease. I'm actually going to build a four card system in the near future with dual 360mm radiators for mining on. This will then be expanded to a six or possibly eight card set up with three 360mm rads and two pumps.

5970's will be in the top GPU's for the next couple years, plenty of time to pay the blocks off and save for the next generation of GPU (Other than 6990 which isn't much better).

Well the latest 6k series isn't near as good as the 5970 because of the architecture used. And it will be a few years until the next architecture is released so until then the 5970 will remain on top. Unless however someone makes an optimised miner for the 6990, at which point I will switch to that.