First of all, he decapitated a Core i9-11900K, i.e. removed the heat spreader. This doesn’t seem to be that easy. On the one hand because there are some SMD components on the circuit board and next to the heat spreader that must not be damaged and on the other hand because of the larger area of the chip, which increases the shear forces and makes detaching the indium more difficult.
For Rocket Lake-S, Intel only produces one chip variant with eight Cypress Cove cores and the integrated graphics unit. There is no longer a distinction between processors with six or fewer cores in the form of a second chip. Due to the larger cores, the new chip grows from 206 to around 270 mm² – it is a quarter to a third larger.
If the heat spreader is loosened, the underside is completely gold-plated. This is done to create an adhesion layer for the indium. So far, Intel only gilded the area that was also covered by the chip.
The information about the thickness of the chip or the heat spreader was also interesting. With Comet Lake-S, Intel reduced the thickness of the chip from 0.8 to 0.5 mm. Accordingly, the heat spreader has become thicker by this amount. With Rocket Lake-S, Intel has returned to a size (2.36 mm) in the heatspreader that we last saw with the Core i9-9900K. The chip itself comes back to 0.6 mm, so it has become a bit thicker again compared to Comet Lake-S. In the run-up to the launch, Intel did not want to give us a final answer to the question of whether the Thin Die STIM is used as it is with Comet Lake-S. Apparently the chip has gotten a bit thicker again.
The further discrepancy in the thickness of the entire package is absorbed by the circuit board. For a Core i9-10900K, this is 1.135 mm thick. The Core i9-11900K is 1.23 mm. So here Intel catches the missing 0.1 mm again.
Finally, Roman also looked at whether the temperatures would improve if liquid metal was used instead of soldering with indium. He is a bit surprised by the measured 12 ° C difference – the processor or the chip becomes significantly cooler. He is surprised by this result and will certainly deliver further results here that confirm this.
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decapitated Core i911900K shows slightly thicker package significantly temperatures