Deepcool

Deepcool G40

Expert rating5.8 / 10

Material:: Silicone-Based
Thermal Conductivity:: 5.2 W/mK
Electrical Conductivity:: Non-Conductive
Recommended Use:: High-end CPU/GPU

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Manufacturer: Deepcool Last updated: 2026-09-15

Deepcool G40 Review

Deepcool G40 is the larger 4g sibling to G15, an identical silicone-based, nanotechnology-processed thermal paste officially rated at 5.2 W/mK and marketed at the overclocking community.

G40 and G15 share the same formula and the same 5.2 W/mK rating, the only real difference is grease weight: 4g here versus 1.5g for G15. If you're maintaining multiple systems, doing repeat reapplications, or just don't want to run out mid-build on a dual-GPU or CPU-plus-GPU repaste, G40 is the more practical buy for essentially the same per-gram formula.

Thermal Performance and Conductivity

Officially rated at 5.2 W/(m·K), identical to G15, positioning it as a mid-tier overclocking compound above Deepcool's Z-series but below the DS7/DS9 lines.

Compound Type and Composition

Same organosilicon, nanotechnology-processed formula as G15.

Application and Consistency

Syringe packaging, same stable and non-volatile nanotech formula as G15, just more of it.

Electrical Safety

Non-conductive and corrosion resistant, per Deepcool.

Comparison to Alternatives

Identical conductivity to G15; the deciding factor between the two is simply how much paste you need per purchase.

Our verdict

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

Expert rating5.8 / 10

An overclocking-focused entry paste from Deepcool, adequate but unremarkable.

Best for

Multiple installs, dual-GPU setups, or repeat reapplications from one tube
Overclockers who want the G-series conductivity in a larger package

Not for

Single-install buyers who don't need 4g of paste (G15's 1.5g is cheaper and sufficient)
Buyers who need DS7/DS9-tier top-end conductivity

Specifications

What these specs mean

Identity and form

Material Class	Silicone-Based (Deepcool describes it as an "organosilicon material" using nanotechnology)

Thermal performance

Conductivity Source	https://www.deepcool.com/products/Accessories/ThermalPaste/2021/11408.shtml

Electrical and board risk

Paste Segment	Standard Paste

Operating envelope

Min Operating Temperature	-50 C
Max Operating Temperature	240 C

Quantity, volume versus weight

Density	2.6 g/cm3

Thermal Conductivity	5.2 W/mK
Electrical Conductivity	Insulating
Package Size	4 g grease weight (16 g net weight incl. syringe)
Recommended Use	High-end CPU/GPU (marketed for the overclocking community and extreme gamers)

FAQs

What are the key specifications of the Deepcool G40 (Silicone-Based/Non-Conductive/5.2 W/mK/Overclocking-Focused Paste)?

Key specs for the Deepcool G40: Thermal Conductivity 5.2 W/mK, Thermal Conductivity Source https://www.deepcool.com/products/Accessories/ThermalPaste/2021/11408.shtml, Electrical Conductivity Insulating, Material Silicone-Based (Deepcool describes it as an "organosilicon material" using nanotechnology), Operating Temperature -50°C to +240°C, Density 2.6 g/cm3.

Will the Deepcool G40 (Silicone-Based/Non-Conductive/5.2 W/mK/Overclocking-Focused Paste) work with my current setup?

The Deepcool G40 (Silicone-Based/Non-Conductive/5.2 W/mK/Overclocking-Focused Paste) lists Thermal Conductivity is 5.2 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 Deepcool G40 (Silicone-Based/Non-Conductive/5.2 W/mK/Overclocking-Focused Paste) best suited to?

Best suited to: Multiple installs, dual-GPU setups, or repeat reapplications from one tube; Overclockers who want the G-series conductivity in a larger package.

What are the drawbacks of the Deepcool G40 (Silicone-Based/Non-Conductive/5.2 W/mK/Overclocking-Focused Paste)?

Not the best fit for: Single-install buyers who don't need 4g of paste (G15's 1.5g is cheaper and sufficient); Buyers who need DS7/DS9-tier top-end conductivity.