CS Labs K5-Pro
Expert rating5.7 / 10
- Material:
- Silicone-Based
- Thermal Conductivity:
- >5.3 W/mK
- Electrical Conductivity:
- Non-Conductive
- Recommended Use:
- Laptop-Thin-GPU
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Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Manufacturer: CS Labs (Computer Systems, Greece) Last updated: 2026-09-15
Where to buy
- CS Labs / Computer Systems (Manufacturer)Go to store
- AmazonGo to store
- NeweggGo to store
CS Labs K5-Pro Review
Looking up cs labs k5-pro thermal putty specs after seeing it recommended on Reddit and LTT as a thermal pad replacement?
K5-Pro isn't really a CPU paste, it's a gummy silicone putty designed to replace worn-out thermal pads on GPU VRAM and MOSFETs, popularized after Linus Tech Tips and multiple Reddit threads recommended it as a cheap pad substitute for older laptops and graphics cards.
Thermal Performance
At a rated >5.3 W/mK it beats a typical stock thermal pad by roughly 3x per the manufacturer's own comparison, though dedicated premium pads like Fujipoly's higher-end lines will still outperform it according to user testing.
Application
Sold as a 20g jar, 3x10g twist-up tubes, or bulk up to 400g, it's meant to be pressed into gaps where thermal pads used to sit, not spread thin like a CPU paste. Community reports note it can behave poorly above roughly 3mm gap thickness or under sustained high heat.
Safety
Non-conductive per the manufacturer, rated for continuous use from -90 C to 250 C, with no stated expiration date.
Our verdict
Reviewed by Burooj Alam. Rated by us, not by users.
Expert rating5.7 / 10
A viscous putty-style pad replacement, a niche option for gap-filling rather than a typical CPU paste.
Best for
- GPU VRAM/MOSFET thermal pad replacement
- Laptop thin-GPU repairs
- Console (PS5/Xbox) repastes where pads have degraded
Not for
- CPU IHS-to-cooler mounting
- Gaps thicker than a few millimeters
- Sustained extreme heat applications
Specifications
What these specs meanIdentity and form
| Brand | CS Labs |
|---|---|
| Model | K5-PRO |
| Material Class | Silicone-Based gummy putty (liquid thermal pad substitute) |
Thermal performance
| Conductivity Source | https://computer-systems.gr/products/k5-pro-20g/ |
|---|
Electrical and board risk
| Paste Segment | Standard Paste |
|---|
Operating envelope
| Min Operating Temperature | -90 C |
|---|---|
| Max Operating Temperature | 250 C |
| Thermal Conductivity | >5.3 W/mK |
|---|---|
| Electrical Conductivity | Insulating |
| Package Size | 20g jar; also sold as 3x10g twist-up tubes and in bulk up to 400g |
| Recommended Use | Thermal pad replacement for GPU VRAM/MOSFETs and laptop hot spots, not a CPU IHS-to-cooler paste |
FAQs
What are the key specifications of the CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK)?
Key specs for the CS Labs K5-Pro: Thermal Conductivity >5.3 W/mK, Thermal Conductivity Source https://computer-systems.gr/products/k5-pro-20g/, Electrical Conductivity Insulating, Material Silicone-Based gummy putty (liquid thermal pad substitute), Operating Temperature -90 to 250 C, Shelf Life No expiration date per manufacturer.
Will the CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK) work with my current setup?
The CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK) lists Thermal Conductivity is >5.3 W/mK. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.
Who is the CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK) best suited to?
Best suited to: GPU VRAM/MOSFET thermal pad replacement; Laptop thin-GPU repairs; Console (PS5/Xbox) repastes where pads have degraded.
What are the drawbacks of the CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK)?
Not the best fit for: CPU IHS-to-cooler mounting; Gaps thicker than a few millimeters; Sustained extreme heat applications.
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