In January 2006, Intel officially released the latest 65nm process Cedar Mill core Pentium 4 processor to the world, models 631, 641, 651, and 661, the frequency from 3GHz to 3.6 GHz, used with PLGA775 socket motherboard. Today, some users discovered that the Intel Pentium 4 661 with 1 core and 2 threads can pass the Windows 11 upgrade detection. Although its motherboard does not meet the requirements for UEFI support, it is amazing enough.
Windows 11 upgrade conditions are 1 GHz or faster 64-bit processor dual-core or multi-core or system-on-chip (SoC), and this processor happens to be Intel 64 architecture, it supports 64-bit instruction set. Although it is a single-core, it happens to have the help of hyper-threading technology, and it is a typical high-frequency CPU at that time.
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Hence, this processor meets the basic conditions, it happens that the Intel Family 15 microprocessor family is not in the list of unsupported CPUIDs in the Microsoft computer health check application, so it magically passed the Win11 upgrade detection in the end.
Moreover, Pentium 4 661 processor actually meets the upgrade conditions except for the safe boot and TPM 2.0, and the users can also boot after the installation using the mirror file. Although this processor, which represents the Intel 64-NetBurst micro-architecture, has very weak parameters, it is not too bad in performance in some situations. Some users have even found that it can make some of them even today.
