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PTM 7950 on RX 6800 XT results for anyone who cares (lemmy.world)

submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]

7 comments fedilink hide all child comments

RED = Thermal Grizzly Carbonaut
GREEN = PTM 7950 (no idea if the original or some fake but it works, bought from random seller on Aliexpress)
before Arctic MX-4 was hitting TJmax 110C at 312W (good temps comparable to Carbonaut for first few days after application then drastic increase in short time due to pumpout issue)
stock paste was hitting TJmax 110C at 255W (when I got the card it was used and already almost 2y old)

Unfortunately I don't have any data for the MX-4 and stock paste to put in the graph.

Testing was done with TimeSpy GPU Test 2 on a loop for 10 loops.

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[–] [email protected] 3 points 10 months ago (1 children)

That's a pretty insane delta from paste alone. Is everything truly equal otherwise? Ambient? Heat build up in the case? 5 degrees centigrade simply sounds too good to be true!

[–] [email protected] 2 points 10 months ago* (last edited 10 months ago) (1 children)

Ambient was 1C to max 2C lower when testing PTM. Everything else is equal... except GPU fan speed which I forgot to cap at static RPM which means the PTM should give even better temps as it ran at lower fan speed too. (that's why I included it in the graph)

Carbonaut was tested in case with side panel. I tested PTM with and without side panel but the results are the same.

I should have also mentioned that when switching to Carbonaut it was absolutely necessary to use washers for higher mounting pressure otherwise the cooler was making very poor contact or no contact at all as the pad is extremely thin which resulted in significantly worse temps than stock paste.

I left the washers also when applying PTM so at least it's directly comparable to my Carbonaut results and I assume I would ran into the same issue as it's also very thin... and very, very difficult to apply.

EDIT:

Regarding Carbonaut, I've been benching yesterday the card to see how much the graphene pad can handle and even at 375W I still didn't manage to hit the TJmax of 110C and was able to get to Top100 in TimeSpy with GPU score on 6800 XT. This was absolutely impossible even with fresh application of MX-4.

I'm yet to try the same settings with PTM.

[–] [email protected] 2 points 10 months ago (2 children)

Shame you didn't have a Kryosheet. Been thinking about that one lately, and it's supposed to perform better than the Carbonaut.

Still, really impressive what that pad can do!

[–] [email protected] 2 points 10 months ago* (last edited 10 months ago) (1 children)

Well, I've tried some big OC and shoved 400W into the GPU and the PTM is still managing it even on air cooling. (Not reaching actual 400W because of hitting TDC limits in this test and I didn't capture again after increasing TDC but just add 2-3C to the blue graph). This is without side panel and at 100% fan speed obviously.

[–] [email protected] 2 points 10 months ago (1 children)

Super impressive, honestly, but I'm not surprised with Thermal Grizzly. I can't tell from the images, but did you use the pad for the VRMs and Caps, too?

[–] [email protected] 2 points 10 months ago

Nope, stock ones

[–] [email protected] 2 points 10 months ago

Yeah, I'm just a moron that's why. I didn't realize that there are basically two graphene pads from Thermal Grizzly and whenever I searched for "Thermal Grizzly graphene pad" I only came up with Carbonaut while I actually wanted the Kryosheet. At the time I thought it's the same and I've bought the Carbonaut thinking it's the one that's been optimized for Z-axis cooling.