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CS Labs K5 Pro thermal paste
CS Labs (Computer Systems, Greece)

CS Labs K5-Pro

Thermal PasteView on computer-systems.gr
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 K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK) 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.

Specifications

Identity and form

BrandCS Labs
ModelK5-PRO
Thermal Conductivity5.3 W/mK
Electrical ConductivityInsulating
Package Size20g jar; also sold as 3x10g twist-up tubes and in bulk up to 400g
Recommended UseThermal pad replacement for GPU VRAM/MOSFETs and laptop hot spots, not a CPU IHS-to-cooler paste
MaterialSilicone-Based gummy putty (liquid thermal pad substitute)
Operating Temperature-90 to 250 C
Shelf LifeNo expiration date per manufacturer
Paste SegmentStandard Paste
Min Operating Temp-90 C
Max Operating Temp250 C

Expert Review

Reviewed by Burooj Alam. Rated by us, not by users.

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

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)?

The CS Labs K5-Pro (Silicone-Based/Non-Conductive/Viscous Thermal Pad Replacement Putty/5.3 W/mK) is a thermal paste from CS Labs (Computer Systems, Greece). Key specs: Form Paste, Material Silicone-Based gummy putty (liquid thermal pad substitute), Thermal Conductivity 5.3, Electrical Conductivity Non-Conductive, Recommended Use Thermal pad replacement for GPU VRAM/MOSFETs and laptop hot spots, not a CPU IHS-to-cooler paste.

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. 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?

It suits 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)?

It is a poor fit for cpu ihs-to-cooler mounting, gaps thicker than a few millimeters, sustained extreme heat applications.

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