De-lidding & Speed-binning Examined

👤by Matthew Hodgson Comments 📅26-03-18
De-lidding Process (Continued)
After the cleaning procedure, you’re left with a shiny CPU core and a smooth IHS, ready for the liquid metal treatment.

OcUK use Thermal Grizzly Conductonaut, a liquid metal with incredible thermal conductivity properties. Extreme care has to be taken here due to the conductivity of the product; if this ends up anywhere it shouldn’t be, short circuits could occur, possibly causing irreparable damage. The 7700K features no resistors on top of the PCB but other CPUs can house them, causing extra issues where prevention techniques must be applied – such as covering them in a heat-resistant glue to prevent any ingress from the liquid metal.

A tiny amount of Thermal Grizzly is applied to the core and the corresponding position on the inside of the IHS, this is then spread into a thin, even layer using a cotton bud. Getting the liquid metal as thin and even as possible helps to equalise the CPU core temperatures; OcUK will re-apply the liquid metal if any two cores vary by more than 6°C (Maximum temperature) during a stress test.

Replacing the IHS can be done in two different ways. The ILM on the motherboard socket is designed to apply an exact amount of pressure in a uniform manner, ensuring the CPU is properly seated. This precise locking mechanism can be used to hold the IHS in place on top of the CPU, without any need for glues or adhesives; the benefit of this is being able to quickly and easily re-access the CPU die if the de-lid results aren’t perfect.

The other method is to use heat-resistant silicon glue or superglue, aiming to keep the layer as thin as possible to reduce the distance between the IHS and the core of the CPU.

Assuming that an adhesive has been applied, that must be allowed time to cure. There’s several ways you can hold the IHS in place, but OcUK have found an old, faulty ILM from a broken motherboard is the best possible method, relying on years of Intel’s research into socket designs to apply the perfect amount of pressure. It’s “rough and ready” but it works a treat!

Now it’s time for testing.

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