It has been discovered that the Intel Alder Lake series has processors with and without support for AVX512, an instruction set that was always at the center of controversy since Intel decided to stop supporting it after it was available only for those performances cores (P-Core) of Alder Lake.
Intel Alder Lake: AVX512 CPUs were found to have a different logo
The new Alder Lake 12-generation desktop processor series was listed with AVX512 instruction support in the developer guide. However, Intel later changed the guide and listed AVX512 as disabled.
Some motherboard manufacturers even continued to support these instructions, as long as the CPU model supported it.
Everything changed in March when Intel decided to remove AVX512 instructions at the silicon level. Even with compatible motherboards in BIOS to enable the instructions, they don’t work on new processors with the instructions disabled.
Fortunately, there is a way to tell if a processor has the instructions or not, thanks to a logo that has changed on the new Alder Lake CPUs. This helps to distinguish at a glance those processors compatible with the instructions, which is through the logo in the form of an ellipse. Those processors that do not have the instructions are represented by two squares, one larger than the other.
”I wanted to add this information to my AVX-512 monster video since I couldn’t get AVX-512 to work on any of my previous G7400 CPUs. The hardware itself was fine, but none of those G7400 CPUs actually had AVX-512 support available, as it was disabled by Intel out of the box, which is pretty much the case for all newer Alder Lake CPUs.
It looks like almost all 2022 Alder Lake CPUs have AVX-512 disabled, so it’s best to look for a 2021 CPU. Luckily for us, Intel left a flag to determine if the CPU supports AVX-512 or not by looking at the IHS. All CPUs that have a halo/circle mark above the word Intel in the IHS will have AVX-512 support, and all CPUs with rectangle/square marks will have it disabled by Intel.
So, at least with Pentiums and other low-end models, you can just walk into a store and look at the processor’s IHS from the little window and determine if it has AVX-512 or not.”
– Says overclocker Luumi
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