Rofa1234

That is true at the moment I know. Dowsil TC-5550 and TC-5960 will be available under a different brand in Germany later this year or early next year for TC-5960.

TFX has poor longevity, better avoid it. It is a good example that simply putting in a huge amount of filler won't work. It has great initial performance that's for sure. The devil comes in the longer-term. When I tested this a long time ago I wasn't aware, I noticed it later. https://koolingmonster.com/insights/what-is-thermal-conductivity-and-is-it-always-good-for-thermal-paste Best paste in the market right now is certainly TC-5960 from Dow Chemical. The older ones TC-5550 and TC-5888 are great as well. Others I would recommend are Koolingmonster Kold-01 and Aerocool Fuzion. All of them are hard to buy unortunately.

Honeywell also offers 0.2mm thickness: https://www.caplinq.com/ptm7950-most-thermally-conductive-phase-change-pad-with-very-low-thermal-impedance-that-works-in-vertical-applications-ptm7950.html

Yes I have, it was a lot worse than the PTM7950 phase change pad or TC-5888. Note that there are some rebrand of TC-5888 in the market, I believe Kold-01 is a TC-5888 rebrand and possibly Aerocool Fuzion too. I posted some results here I think. My favourite pastes are TC-5888/Kold-01/Fuzion/Shin-Etsu X-23-8117/Thermal Hero Quantum. Haven't tested TC-5550 and TC-5960 yet, they don't sell directly to end consumers, they are hard to buy.

Dowsil TC-5550 looks good here: https://youtu.be/htp7e1w_BdY?t=330 They also released a new paste called TC-5960 recently which from the specs is the best paste from Dowsil. They don't mention it is for PCM replacement unlike TC-5550, not sure if it's better than TC-5550 for a laptop CPU though. TC-5888 was great and in fact the best paste I have, if one of them is better this might be the best bare die paste in the market at the moment. TC-5960 maybe also for desktop CPUs because the bondline thickness has been reduced compared to TC-5888 down from 0.02mm to 0.016mm despite the higher viscosity.

I made a mistake, I meant to say Kryosheet didn't work, it hit 100C very fast. On uneven low pressure laptop heatsinks it is more limited than PTM7950 or a medium-high viscous paste.

Kryonaut didn't work on my laptop because of a bad contact. On a laptop it is a risk trying it out. If it works it can be great.

Here is a test with 25 pastes/pads on a GPU: https://youtu.be/RQ0jmVQ3Lvg?t=1455

I did a second test with Heatphase Ultra with identical temperatures to PTM7950. Consistency also identical to me, specs identical as well by the looks of it. It is very likely this is a simple rebrand of PTM7950.

I tried Heatphase Ultra and it's very similar to PTM7950, maybe the same. In my first try it was a bit behind PTM7950 but this might be a simple measurement inaccuracy, I would have to do a second run and a back to back comparison with PTM7950. They are great, that's for sure. Only the very very best thermal pastes can reach PTM7950 or Heatphase Ultra. I also tried KryoSheet but this failed on my laptop CPU, it didn't work. It can't fill up the uneven heatsink or it's not flexible enough.

Thermal Hero Quantum is a good choice on my laptop, maybe 0.5°C behind the best (Kold-01, Aerocool Fuzion). Maybe it's worth a try for someone who wants to try out something new. By the way I believe Kold-01 is a reband of DOWSIL TC-5888 because the specs are identical, it's exactly the same. Also to me Kold-01 and Fuzion are identical, same paste to me. Dowsil has released a new paste in 2023 called TC-5550. They say it's designed especially for bare die chips and can be used instead of PCM. Specs are almost same to TC-5888, biggest difference is that the viscosity is quite a bit higher at High Strain on TC-5550 which can be a good thing for bare die chips with subpar heatsink contact. Also the thixotropy seems higher. I wonder if this can be better than TC-5888, unfortunately this paste is hard to get.

This video could be interesting for some, it's about the "misleading W/mK Marketing" https://youtu.be/_kzGTOyCYrY

Initial 30 minutes OCCT temperature test. 1 day makes no difference. Ok maybe some can improve by 0.5 degrees after 1 day of curing or something like that but who cares, every application with the same paste can differ that much. I tried Gelid GC-4 the other day and there is no magic improvement. Curing is not a thing anymore. Gelid and many other even avdertize their pastes with Non-Curing. 1 week and more is longevity. I cannot test longevity, impossible to do on such a big number of pastes I tested in the last two years and how to test it equally for all in exactly the same way. However a paste that is 5+ degrees worse from the beginning is not a great deal in my books even if it has good longevity. I guess PTM7950 should be the best choice for longevity and also seems to have great temps from the beginning.

Alpenföhn Blitzeis is quite good, although it seems to be slightly below Kooling Monster KOLD-01. I tried two Blitzeis applications and this is the better one. Gelid GC-4 90/93/91/92 Alpenföhn Blitzeis 86/88/86/87 Kooling Monster KOLD-01 83/87/85/86

Gelid GC-4 3.5g only 7€ on Amazon.de, I made a first test with this and it's not looking good. It's not competing with the best. The Gelid stuff isn't working for me sadly. I have ordered PTM7950 and Alpenföhn Blitzeis. The specs from Blitzeis and Halnziye HY-P15 are pretty much identical. Maybe the same paste, I don't know.