Delidding a CPU, removing the integrated heat spreader to expose the bare silicon die, changes the thermal paste equation entirely, and using the wrong compound or method on a delidded chip can cost you the temperature gains you delidded for in the first place, or damage the die.
Why Delidded CPUs Need a Different Approach
With the integrated heat spreader removed, a delidded CPU has liquid metal or thermal paste applied directly between the bare die and the heat spreader (if reattached) or directly to the cooler, eliminating one thermal interface layer compared to a stock configuration. This is precisely why delidding lowers temperatures, but it also means the compound choice matters more: liquid metal offers the best possible die-to-spreader conductivity but carries real risk of electrical shorts if it spreads onto surrounding motherboard components, while conventional paste is safer but sacrifices some of the thermal gain that motivated the delid.
Liquid Metal Considerations
Liquid metal thermal compounds, gallium-based alloys, conduct heat dramatically better than standard silicone-based pastes, which is why they're the go-to choice for die-direct contact on delidded CPUs. They are electrically conductive, however, meaning careful, sparing application and proper masking of surrounding components is not optional; a small excess can find its way onto the substrate or nearby capacitors with real consequences.
When Standard Paste Still Makes Sense
If your delid setup reattaches the heat spreader (a "relid") with adhesive rather than exposing the bare die directly to the cooler, standard high-performance thermal paste between the die and reattached spreader, and again between spreader and cooler, is often the safer and still meaningfully effective choice, avoiding liquid metal's short-circuit risk entirely.
What to Actually Check Before Delidding
Confirm your specific CPU model and cooler setup are commonly delidded successfully, since results and risk vary by chip generation and packaging. If choosing liquid metal, budget time for careful, minimal application with proper masking, and know that delidding voids your CPU's warranty on nearly every retail chip.
Winner
Liquid metal delivers the best possible thermal result for die-direct delidded setups, but only for users comfortable with the application risk. Standard paste on a relidded chip is the safer path to most of the thermal benefit.
Pros and Cons
Liquid metal on bare die: Best possible thermal conductivity, but electrically risky if applied carelessly and requires periodic reapplication as it can degrade over time.
Standard paste on a relidded chip: Safer with no short-circuit risk, though it forfeits some of the thermal ceiling liquid metal could provide.
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