XFX MERC 319 Radeon RX 7800 XT - Teardown - Re-pad VRAM (1mm) FAIL - Repaste Kryonaut

Описание

Lenovo P520 Workstation
Xeon W-2155
XFX Speedster MERC 319 RX 7800 XT BLACK Edition
128GB DDR4 2666 RAM
Ambient Temp: 20.5c

TLDR, buy .75mm pads for VRAM and the factory GPU paste is at least on par with kryonaut so no real need to change it unless you just feel like splitting the card.

Silent video, just for reference.

Added Gelid Ultimate clone pads to VRAM 1mm (Fail, not compressable enough and/or probably not the right size)
After much thought this probably requires either very soft 1mm or high density .75mm pad
Both problems could be solved by a good thermal putty
3DMark Speedway Stress Test 10 Minutes

During the 1st test it became very apparent the GPU die mounting pressure was not where it should be.

GPU temp was ok, but the hotspot hit 100c slowly. This was indicative of the 1mm new pads not being as compressable as the stock 1mm pads. Its also possible these are a more odd .75mm size pad as well. But they look extremely identical to fresh 1mm pads.

Split the card again, added back the oem thermal pads on VRAM and temps were back to nearly the identical.

The OEM paste is about as good as thermal grizzly kryonaut. Unless you have temps that are unreasonably high there is no reason to change the paste on the this card.

If you want to lower memory temps you will need to find very low density 1mm pads (or possibly .75mm) for the VRAM. Alternatives like 3d graphite pads which are designed to be highly compressable may work here as well.

I have some 13.5w/mk putty coming in that I will run on the VRAM instead of the oem pads, that will be very compressable.

I may try to stack some .3mm copper shims with thin K5 Pro putty on the memory as well.

Stock Paste: 10 Minute Stress Test
Max GPU: 65c
Max GPU Hotspot: 80c
Max Memory Junction: 82c

Kryonaut Paste: 10 Minute Stress Test
Max GPU: 63c
Max GPU Hotspot: 78.8c
Max Memory Junction: 82c

00:00 Intro
01:56 Teardown XFX RX 7800 XT Merc
10:46 Clean, Pads and Paste
15:15 Pad sizing
26:50 Cutting and applying new pads
38:29 Testing and finding a failure
46:45 Teardown again
50:00 Replace OEM Pads
57:58 Retesting
59:28 We need squishy 1mm pads or .75mm