Convex or concave? First everything is (almost) straight
What was and is visible are the consequences for the respective installed CPU and its heatspreader when it closes the causal chain. By the way, the fact that there are exceptions to this also led me to the solution later, but I don’t want to get ahead of myself. The fact is that a lot of complaints referred to visibly upward curved, i.e. convex heatspreaders or a completely crooked impression after assembly and disassembly. How something like this can look like is shown later by the pictures of the customers, which were sent to the respective manufacturers and from which I have selected some exemplarily.
But let’s start with the new, virgin CPU. With almost all CPUs, which I could also test in the meantime, a quite pleasing picture of the heatspreader results, which is similar to the one from the launch article. On the contrary, with most CPUs we could even notice a slightly concave depression of the IHS in the middle. But what then drives the IHS up the middle above the die and even deforms it in some circumstances?
Let’s take a look at a CPU with a concave IHS, which has kept its shape even after use. We’ll see how to achieve this in a moment, keyword solution approach. And if you look closely at the image from the 3D profilometer (pictured above), you can even see a slightly darker border on the reddish colored IHS surface. Exactly this increase can be traced on different CPUs again and again.
After assembly: the CPU bulges
And now we look at the result after installation and commissioning at the customers, who in the meantime have also contacted the manufacturers. This does not deviate from what one can otherwise read on this topic in the relevant forums. You can see very clearly on the following picture that not only the heatspreader is suddenly convex upwards, but almost the whole CPU has bent.
The next picture shows that the thermal paste is also distributed very unevenly in such curvatures. Here we experienced a terrific failure with our own water block and standard backplate of the manufacturer. The fact that something like this does not cool optimally does not really need to be mentioned anymore.
But if even high-end coolers fail when installed according to instructions and with original parts, then there must be other reasons than too little contact pressure or lack of skills in applying thermal paste. That’s exactly what we see now on the next page.
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