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Phase Change Material (PCM)

Nebell said:
PTM7950 was amazing on my 4090 gaming laptop with 13980HX. From overheating CPU to about 75c during max use in Cinebench. It worked really well with the GPU as well.
However I'm not very impressed with it on my 7950x3d. I'm having 47-48c idle and it goes up to thermal limit (85c) when running Cinebench with a 360 AIO. I'm not sure if it's the cooler or something else, but definitely not impressed.
Click to expand...
Sometimes AIO's can keep phase change material from melting properly, causing abnormal temp behavior.

It can also take a few thermal cycles to achieve its peak performance. If you've only just put it on and are still in your first evening of testing, wait a couple of days and use the PC. Then do another round of testing and compare.

Also, it doesn't give huge benefits on a CPU with an IHS, like it does on bare GPU and laptop chips. Overall, temps will be similar to a good paste.
although it won't dry out or pump out over time. And personally, I have noticed smaller differences in temps between cores.
 
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I just put PTM7950 on my 7800x3d and really haven't noticed much difference between it and MX-6. It kisses 80c from time too time running cinebench compared to low 80s with the MX-6 on a 360 AIO.
 
Nebell said:
PTM7950 was amazing on my 4090 gaming laptop with 13980HX. From overheating CPU to about 75c during max use in Cinebench. It worked really well with the GPU as well.
However I'm not very impressed with it on my 7950x3d. I'm having 47-48c idle and it goes up to thermal limit (85c) when running Cinebench with a 360 AIO. I'm not sure if it's the cooler or something else, but definitely not impressed.
Click to expand...
Guessing your laptop has bare dies like mine, and your desktop has a heat spreader?

Maybe the heat spreader is flexing, I heard they can. How do you apply regular paste, put a dot down and let the HS spread it as you tighten it?
 
I had some Thermalright Helios fail after just a couple of days of use. This is not the first time I have used it, either.

I simply turned on my computer one day------and my Core Ultra 265K was running a lot warmer. Idling at 50c instead of like 42c. and max load was ~10c higher. Gaming was 5 - 8c higher.

Cooler install was totally fine and when I removed it, the Helios looked perfect.

I swapped over to some Joyjom brand PTM 7950 which I have used many times, and everything is back to normal for now.
 
chameleoneel said:
I had some Thermalright Helios fail after just a couple of days of use. This is not the first time I have used it, either.

I simply turned on my computer one day------and my Core Ultra 265K was running a lot warmer. Idling at 50c instead of like 42c. and max load was ~10c higher. Gaming was 5 - 8c higher.

Cooler install was totally fine and when I removed it, the Helios looked perfect.

I swapped over to some Joyjom brand PTM 7950 which I have used many times, and everything is back to normal for now.
Click to expand...
Gonna use this on my 6800XT soon as well. I like the performance and durability of it but it's a bit fragile to work with.
 
I only put a 120mm dual tower and fans on a 7900x3d in a 2000d ~sff case and used mx6 for the first time. I really like it.
 
I repasted my laptop with PTM7950 today. Made a crazy difference! It was constantly pinging off redline. Now it peaks around 85*C. Throw enough at it, and it will still throttle, but it's noticeably better. Probably would've been improved with any normal paste, since it was likely original to the ~6yr old laptop. But wow what a difference!

I got a 40x80mm sheet, so used it on my 12600K/280-AIO, too. Seems to be as good as the Thermalright stuff I had used previously.

-bZj
 
Down8 said:
I repasted my laptop with PTM7950 today. Made a crazy difference! It was constantly pinging off redline. Now it peaks around 85*C. Throw enough at it, and it will still throttle, but it's noticeably better. Probably would've been improved with any normal paste, since it was likely original to the ~6yr old laptop. But wow what a difference!

I got a 40x80mm sheet, so used it on my 12600K/280-AIO, too. Seems to be as good as the Thermalright stuff I had used previously.

-bZj
Click to expand...
Yeah and the point of the PTM is.....your laptop should have more/less the same temperature performance a year from now. Whereas normal paste would likely start pumping out and by 1 year, temps/performance would be worse.
 
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Didn't know about the Ebuy7 store so i bought the TG ptm a while back and put it on a 5900X with an old D14 and an A14 G2 fan and with y-cruncher it doesn't go over 70C. Seems good enough to me. Was thinking about putting it on my EVGA 3080FTW3 but reading this thread where it's mentioned that it already uses the 7950 i'm glad i didn't go ahead with it.
 
Just used a cut square of this on my new 9900X build with a Noctua cooler and its all working fine.

No before and after temps as I used it from assembly. All within limits.
 
Yeah, I forget the brand I used on my 7800X3D, but it was a thermal past companies 'new improved' stuff a year and a half ago. It's so simple to use and comparable that I really can't see going back to paste ever. And the prices are not bad!
 
I've used Joyjom brand on Amazon for a couple years. With good results. But my last order isn't working as well. And Thermalright's V1 Heilos is weird. Sometimes I boot and temps are a few degrees higher across the board. Other times, it's great. They have a V2. But availability is poor, at this point.

So I got some Thermal Grizzly Phasesheet. So far, it's fantastic. And actually took a few Thermal cycles to be optimal, like legit Honeywell 7950.
Cost is higher. But, it seems like a good product.

**this post is in the context of cooling a CPU with stock IHS.
 
chameleoneel said:
I've used Joyjom brand on Amazon for a couple years. With good results. But my last order isn't working as well. And Thermalright's V1 Heilos is weird. Sometimes I boot and temps are a few degrees higher across the board. Other times, it's great. They have a V2. But availability is poor, at this point.

So I got some Thermal Grizzly Phasesheet. So far, it's fantastic. And actually took a few Thermal cycles to be optimal, like legit Honeywell 7950.
Cost is higher. But, it seems like a good product.

**this post is in the context of cooling a CPU with stock IHS.
Click to expand...

I'm glad my experience has been shared because I thought I might be crazy. I purchased Joyjom PTM7950 two weeks or so ago for a new AIO install on a 5800x3d. Performance was not great, and I was hitting 90c instantly. I gave it a week to cure and did numerous "bake" cycles and performance did not really improve. I got frustrated and removed the stuff and used Kyronaut (all I had on hand), and performance improved and idle temps dropped 5 degrees. It still hits 90c during a load test but holds onto an additional 200-300mhz compared to the Joyjom stuff.

Maybe I need to get my hands on some real PTM7950.
 
Would ptm7950 work with delidded cpus? I want to possibly delid ivy bridge or Skylake, for the effort of getting more OC headroom, and I am torn between tried-and-true liquid metal, or testing ptm. Any thoughts?
 
Haswellbeast said:
Would ptm7950 work with delidded cpus? I want to possibly delid ivy bridge or Skylake, for the effort of getting more OC headroom, and I am torn between tried-and-true liquid metal, or testing ptm. Any thoughts?
Click to expand...
If you going through all the effort to delid you might as well use liquid metal.
 
Haswellbeast said:
Would ptm7950 work with delidded cpus? I want to possibly delid ivy bridge or Skylake, for the effort of getting more OC headroom, and I am torn between tried-and-true liquid metal, or testing ptm. Any thoughts?
Click to expand...
If you want to avoid Liquid Metal: Der8auer actually recommends Kryosheet for a delidded CPU, instead of paste or PTM. Because it will NEVER pump out (its a graphene thermal pad). IT performs within a degree or so of the best pastes, but will maintain that performance even in extreme heat cycling.
 
PTM is fine for delidded CPUs and a better use case than for CPUs with heatspreaders. PTM will work better on naked dies as long as there is good mounting pressure. PTM is a bad idea in most cases for anything that is not a bare die. For CPUs with heatspreaders a quality paste will do a better job than PTM. Whether PTM is the better option for delidded CPUs is not something I have any experience with.
 
SmokeRngs said:
For CPUs with heatspreaders a quality paste will do a better job than PTM.
Click to expand...
Not in my experience, with 3 different CPUs. with 3 different heatsinks, 2 AIO's, 4 different PTM.

PTM is as good as the best Paste, and wont pump out like some pastes.

1 PTM gave me inconsistent results between boots (sometimes temps would be way worse), with 2 of 3 applications. Thermalright Helios. I suspect thats why there is now a V2 (version 2).

------------------

Der8auer didnt outright say it. But, his implication about relidded or direct die cooling, is that even PTM could pump out. Due to the concentrated thermal energy from being directly on the die. So, he recommends Kryosheet for a relid or direct die, over paste and PTM. If you would rather not deal with liquid metal.
 
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I honestly can't find what phase change pad I grabbed (forget the CO, but big thermal paste people), and I can't imagine going back to paste down the road. It's worked really well on my custom loop (even recycled to a new block carefully), and really easy to use.
 
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