I've had this heatsink in my JTAGed jasper since mid-January. It never RRed or overheated prior to putting in the new HS. I did it more as a preventative measure and cause I sold off the XDK it was supposed to go into. I took mental note of the temps for 1 week prior to installation and every moment since, using the temp monintor built into FSD.
Another note is that I did this in conjunction with removal of the inner metal grill, so that also affected temp readings. I also reused the x-clamp from the original GPU, using some old MX TIM on that and the CPU was only shrouded, using original xclamps and TIM.
GPU dropped 10~15C and CPU dropped ~5C. Fans are set to auto and unless my house gets over 75F neither temp goes above 60~62C, no matter how much I play and check. Now there is of course a drastic drop in temps once the load has been removed from the time it takes to quit a game and load FSD, but the fans never 'spin-up' and are always just barely blowing while in-game.
If I put the fans at 100%, temps drop dramatically into the 30~40C range.
On the note of installation, this was a 'nightmare' installing, taking the case on and off 10+ times. The curve of the shroud pushes the set of fins directly in front of the fans (SF1) into the fans. After bending and adjusting the pipe leading to SF1 a dozen different times and not getting it to work, I figured out the key. You must break the tab on the shroud that pulls it into being flush with the fans. Keep in mind, I could bend the pipe so that SF1 didn't go into the fans with the shroud unaltered but as soon as the case was back on, it would be grinding again.
Overall, if you want to put the time into it, it's well worth it. Analyze it all you want over the Internet, but the real-world results are real. I don't have anything to gain from this, just figured I'd let everyone know, since not many people have one.
Good post, I supected this would def lower temp readings since it disperses heat over more than just one or two locations.