Thermal Grizzly Presents PhaseSheet PTM Thermal Pad

[sLowEnd]

Care to bring more details?

Why doesn’t Noctua specify thermal conductivity or thermal resistance of NT-H1 and NT-H2?

While there are some standardised methods for testing the thermal conductivity or thermal resistance of thermal compounds, they do not always guarantee comparable results. What's more, many vendors have started to claim thermal resistance or ther...

faqs.noctua.at

FAQ in the Thermal Grizzly Online Shop

In the FAQ section of the Thermal Grizzly Online Store you will find the answers to the most frequently asked questions about our products!

www.thermal-grizzly.com

Thermal Interfaces for CPUs and GPUs | ARCTIC

ARCTIC’s MX thermal compound is a multiple award winner with extremely high thermal conductivity. Optimal heat transfer with ARCTIC thermal pads.

www.arctic.de

 

[fb020997]

So is it a thing that a Kryosheet is better than thermal paste? I know it's a use once solution, but is it actually better than a near top-of-the-line thermal paste now?

It’s both better on temps (by a couple of degrees on the core and at least 5ºC on the hotspot, at least initially) than the “factory” Alphacool Apex thermal paste that came with my 7900XT’s waterblock, and about a million times better on longevity. Maybe I’m not great on putting thermal paste on GPUs, but the stock paste lasted all of a month before gradually getting worse hotspot temps (from 22ºC delta to 30ºC after 2 months). I put a Kryosheet on it in September, and the hotspot delta is still 12ºC (full load) to 15ºC (partial load).
Yes, on low loads it’s worse, but it’s normal, as per TPU test. Still, miles better than paste.

 

[ARF]

@sLowEnd Those links can't be serious, can they?

They write: "While there are some standardised methods for testing the thermal conductivity or thermal resistance of thermal compounds", and then put a comma, say one big BUT, and continue with some type of nonsense.

 

[sLowEnd]

@sLowEnd Those links can't be serious, can they?

They write: "While there are some standardised methods for testing the thermal conductivity or thermal resistance of thermal compounds", and then put a comma, say one big BUT, and continue with some type of nonsense.

They are serious, and if you look at how thermal conductivity is derived, it's pretty easy to see where it can be manipulated too

Thermal Conductivity – What It Is and It's Formula

Thermal conductivity refers to the ability to conduct/transfer heat. It's denoted by k, λ, or κ. Measured in watts per meter kelvin (W/mK).

thermtest.com

 

[phanbuey]

So is it a thing that a Kryosheet is better than thermal paste? I know it's a use once solution, but is it actually better than a near top-of-the-line thermal paste now?

It performs on par to a good higher-end paste - MX-4 and the likes. It's no liquid metal but it also doesnt dry up and create 5 hours of work when it's time to repaste.

 

[R-T-B]

Care to bring more details?

Absolutely. PTM is a phase change material and phase changes are by definition exothermic, bringing heat down. This brings PTMs specs way above what it suggests.

Plus the fact W/m.K can be measured in any situation and is very easy to manipulate as a stat.

 

[Caring1]

It's fairly low thermal conductivity.
Thermal Conductivity（W / m-k)：8.5 W/mk
There are thermal pastes with a higher rating.
I'd expect a thermal pad/ sheet to be around 50W/mK or higher

I've contacted Thermal Grizzly and requested info on their PTM's thermal rating as their downloaded Data sheet is useless and contains nothing that isn't stated already on their website.

This is the reply I got, copied directly from their email to me.

"Hello John,

thank you for the message.

The thermal conductivity values, which are usually determined theoretically, vary greatly depending on the application, as important factors such as contact pressure, temperature or surface cannot be taken into account uniformly.

Since the 4th quarter of 2020, all our cooling products therefore no longer provide specific values for thermal conductivity.

We continue to rely on the test results of independent tests and reviews so that our customers can get a more realistic impression of the performance of our products in practice under comparable circumstances.

We wish you a pleasant start to the week."

W/m-K is a scientific formula and can be reliably repeated under test conditions, therefore I say they SHOULD show that rating on their product, regardless of the end users outcome.

Next Auto makers will remove their fuel consumption tests and rating on new cars using the same excuse, as the testing can be variable etc.

 

[R-T-B]

under test conditions

Which are nearly never the same. That's the issue.

 

[sLowEnd]

W/m-K is a scientific formula and can be reliably repeated under test conditions,

It is, but that's also the crux of the issue. Nobody discloses test parameters. There are standardized tests from ASTM, IEEE, ISO...etc., but who does anything except give a number?

I don't suppose you take dBA and CFM numbers for fans at face value too?

 

[stimpy88]

After looking at Igor's test of the Kryosheet, which he compared it to one of these (different brand) PTM sheets, the PTM sheet clearly performs much better. Do you guys know how long a PTM sheet theoretically lasts for? I understand the Graphene sheets last 10+ years, but how long before the PTM degrades?

 

[Brotato]

Bought that thermalright Helios pad for my 7800x3d. As it’s on an AIO I figure it would be there for the long haul. And if the AIO or motherboard eats it?…I have bigger problems than a 7 dollar thermal pad to replace.

didn’t do the chill or freeze method but just went ahead and tried the install. You only yolo once as kids would say.

effortless install. So if you suck like I do and want to ptm or close enough to it, this would be the one to get.

Fwiw the texture seemed less clay like than the supposed ptm7950 I had purchased from Amazon. That Amazon ptm was mx6 levels of good so we will see how this turns out.

 

[eidairaman1]

I know what it is and what it does, thanks.


"Pump out affect"
When people put on too much thermal paste and don't know how it works.
It is NOT meant to retain a thick layer between the die and cooler, it is meant to fill the minor irregularities only.

Too much makes a mess and can impede proper cooling/airflow (thermal blanket)