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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsA Reddit user reported that an ASUS TUF GeForce RTX 4080’s hotspot temperature fell from about 100°C to 79°C after replacing the card’s stock thermal compound with PTM7950. HotHardware reported the claim on April 18, 2026, but it was a single user’s account—not a controlled or independently verified test.
What the reported 20°C drop means
HotHardware’s headline rounds the reported change to about 20°C. The user’s stated readings—approximately 100°C before and 79°C after—imply a difference of about 21°C. These are reported hotspot readings, not GPU core-temperature readings, and they should not be treated as a benchmark result.
The card was described as an ASUS TUF GeForce RTX 4080. HotHardware expressed uncertainty about the exact variant, so the report does not establish that it was a particular model number or definitively rule out every variant.
What the user changed—and what they noticed
The Reddit user, khobiza, said they removed the stock thermal compound and applied PTM7950, a phase-change thermal interface material. They described the result after one gaming session and also reported quieter fans and more stable-feeling temperatures. Those observations come from the user’s account quoted by HotHardware.
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#1 Best Overall
- PTM7950 is a highly thermally conductive Phase Change Material (PCM) that lasts longer and is more effective than tradiational thermal paste.
- Size 40x80x0.25mm, Phase change, Thermal Conductivity: 8W/m.K,
- PTM7950 is a proprietary material that provides superior reliability and maintains low thermal impedance (<0.06K·cm²/W @ 30Psi), making the PTM7950 series desirable for high performance integrated circuit devices.
- PTM7950, based on a novel polymer PCM system, exhibits excellent interface wetability during typical operating temperature ranges, resulting in extremely low surface contact resistance.
- Package include: 1x Thermal Pad 40x80x0.25mm, 1x Phillips Screwdriver, 1x Cleaning Wipe, 1x Spatula, Finger gloves, 1x Cleaning Brush
The report provides no controlled test protocol, matching before-and-after conditions, repeated runs, or independent validation. It therefore cannot show how much of the change came from PTM7950 itself. Replacing old, degraded, or poorly applied stock compound could also explain some or all of an improvement after a repaste.
Can other RTX 4080 owners expect the same result?
No. This account concerns one card and one reported session; it does not establish a typical result for RTX 4080 graphics cards or PTM7950. The report does not resolve whether the before-and-after readings used the same workload, ambient temperature, fan settings, or measurement method. Nor does it compare GPU core and hotspot readings under controlled conditions.
Rank #2
- PHASE-CHANGE THERMAL PAD FOR CPU AND GPU – PhaseSheet PTM is made as a clean alternative to classic thermal paste.
- PTM MATERIAL FOR STRONG CONTACT UNDER HEAT – The interface adapts during operation and supports efficient heat transfer.
- SUITABLE FOR CPU, GPU AND CONSOLE APPLICATIONS – Useful for repaste jobs, cooler swaps and maintenance on compatible contact surfaces.
- PRACTICAL 50x40 mm FORMAT FOR FLEXIBLE USE – Can be cut to fit many applications and contact areas.
- ELECTRICALLY NON-CONDUCTIVE FOR SAFER HANDLING – Designed for easy installation and stable thermal performance.
HotHardware also discussed a separate earlier investigation involving thermal-compound degradation on a Manli RTX 4080. That is separate context, not evidence that this ASUS card had the same issue.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to know about PTM7950 listings
HotHardware noted that genuine Honeywell PTM7950 can be difficult to find and mentioned a JOYJOM phase-change thermal interface sheet described as 40×80×0.25 mm. That dated listing mention does not authenticate current listings, establish that a particular sheet is genuine Honeywell material, or confirm compatibility with every graphics card. If evaluating a PTM7950 phase-change thermal pad or other GPU thermal interface sheet, verify the seller’s claims and the material’s suitability for the specific card rather than assuming the named listing is validated.
Quick Recap
Best Value
- Thermal Pad PTM7950 Size 100x160x0.25mmmm, Phase change at 45°C, Thermal Pad Conductivity: 8.5W/mK
- PTM7950 Thermal Pad is a highly thermal Conductivity Phase Change Material (PCM) that lasts longer and is more effective than tradiational thermal Pad.
- PTM7950 Thermal Pad is a proprietary material that provides superior reliability (pass 150˚C baking 1000 hours, T/C-B 1000 cycles) and maintains low thermal impedance (<0.04˚Ccm2/W @ no shim), making the PTM7950 thermal pad a good choice for high performance integrated circuit devices.
- PTM7950Thermal Pad, based on a novel polymer PCM system, exhibits excellent interface wetability during typical operating temperature ranges, resulting in extremely low surface contact resistance
- Package include: 1x Thermal Pad 100x160x0.25mm, 1x Phillips Screwdriver, 1x Cleaning Wipe, 1x Spatula, Finger gloves, 1x Cleaning Brush
Rank #4
- PTM7950 is a highly thermally conductive Phase Change Material (PCM) that lasts longer and is more effective than tradiational thermal paste.
- Size 31x50x0.25mm, Phase change at 45°C, Thermal Conductivity: 8.5 W/m.K, It is normal for it to melt at high temperatures.It achieves good heat dissipation performance through repeated melting and solidification. Note: it requires technical and operational skills, it is recommended to use under the guidance of professionals
- PTM7950 is a proprietary material that provides superior reliability (pass 150˚C baking 1000 hours, T/C-B 1000 cycles) and maintains low thermal impedance (<0.04˚Ccm2/W @ no shim), making the PTM7950 series desirable for high performance integrated circuit devices.
- PTM7950, based on a novel polymer PCM system, exhibits excellent interface wetability during typical operating temperature ranges, resulting in extremely low surface contact resistance.
- Package include: 1x PTM7950 Thermal Pad 31x50x0.25mm, 1x Screwdriver, 1x Cleaning Wipe, 1x Spatula, Finger gloves, 1x Cleaning Brush
Rank #3
- PTM7950 is a super highly thermally conductive Phase Change Material (PCM) in both pad and paste formats.
- PTM7950 Thermal Pad Size 80x80x0.25mm, Phase change, Heatsink Thermal Conductivity: 8.5W/m.K
- PTM7950 Thermal Pad is designed to minimize thermal resistance at interfaces, maintain excellent performance through reliability testing, and provide scalable application at a competitive cost.
- PTM7950 is a proprietary material that provides superior reliability (pass 150˚C baking 1000 hours, T/C-B 1000 cycles) and maintains low thermal impedance (<0.04˚Ccm2/W @ no shim), making the PTM7950 for high performance integrated circuit devices like cpu gpu ssd etc
- Package include: 1x PTM7950 Thermal Pad 80x80x0.25mm, 1x Screwdriver, 1x Cleaning Wipe, 1x Spatula, Finger gloves, 1x Cleaning Brush
What the report does—and does not—show
- Reported: One user said the ASUS TUF RTX 4080 hotspot fell from about 100°C to 79°C after a stock-compound replacement with PTM7950.
- Not established: A repeatable 20°C reduction, an independently measured result, or the material’s isolated effect compared with simply applying fresh compound.
- Not established: A universal result for RTX 4080 cards, a verified exact card variant, or current authenticity and compatibility of the mentioned product listing.
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