Updates to the processor lists will occur at each subsequent general availability of Windows. It is expected that the processor list will not reflect the most current offerings from processor manufacturers between updates. Subsequently released and future generations of processors which meet the same principles will be considered as supported, even if not explicitly listed. These processors meet the design principles around security, reliability, and the minimum system requirements for Windows 11. Considering how old this system is, you have many processor generations to pick from - but go for the latest that you can.The processors listed represent the processor models which meet the minimum floor for the supported processor generations and up through the latest processors at the time of publication.

It will be time to upgrade the entire system to something more modern. If you cannot upgrade to an Intel Core 2 Quad processor, there is really nothing that you can do to improve the performance of this system.

Note also that it sometimes requires a BIOS upgrade to enable this support - and, this BIOS upgrade must be installed BEFORE you remove the existing processor. You need to ascertain, from the manufacturer of the motherboard, whether this motherboard has the capability to provide this additional power and, if so, which of the Intel Core 2 Quad processors are supported by the motherboard's BIOS. Now, the Intel Core 2 Quad processors require additional power. Considering the processor that you already have, your only choices for a significant performance upgrade are going to be an upgrade to one of the Intel Core 2 Quad processors. Just to set expectations, there is absolutely no way that you can use any Intel Core i3/i5/i7 processors with this board.

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