Did you actually solder the IHS to the base of the heatsink? If so, how did you manage that (especially without destroying the heatpipes)?
Yes it is actually soldered. There are two version, second being IHS is normal where you can clearly see the solder flowing up around the side (second Noctua C14). I've have a few heatsink which I have soldered the IHS to the heatsink. You can clearly see true performance between different heatsink including old classic "all copper" heatsink with heatpipe. So don't write them off just yet, performance is right up there with todays modern heatsink.
The IHS is clamped under huge pressure then put in an oven. This squeezes out the solder which flows up the side. So you are left with ultra thin layer of solder between IHS & Heatsink, not forgetting both IHS & heatsink is lapped for flatness to the raw copper before soldering. Temperature is monitored but you know when it is ready to come out of the oven when soldered flows up the side giving it a seal all round the IHS. Yes, you have to monitor the temperature very carefully otherwise you will destroy the heatsink.
I believe I did set a world record on air for 939 platform, but I'm not to concern about this, because I know I can go even quicker, but this experimental project was all about "heat transfer". I also tested passive open air bench no fan with the Noctua C14 , but I also have, thermaltake, zalman, silverstone, Dark Rock heatsink from Bequite & a few others with soldered IHS at the base of the Heatsink..
Last edited: