Is Any Intel Core 2 Core Duo Processors Compatible with FreeBSD?

andrew clarke mail at
Tue Feb 18 23:04:44 UTC 2014

On Mon 2014-02-17 23:18:46 UTC-0800, Steve Booth (gotee_rustypaws at wrote:

> I need to replace the CPU in my motherboard and I am planning to
> install FreeBSD. It appears in the FreeBSD Hardware Notes that Core
> Duo is not compatible.

If you read closely this only applies to the amd64 version of FreeBSD.
It is because the original Core Duo doesn't support 64-bit mode
required by FreeBSD-amd64.

Note the Core Duo and Core 2 Duo are different CPUs.

Evidently this has come up before:

> If none of those processors are compatible, would a Core 2 Extreme
> Quad Processor work? The motherboard is using an LGA 775 socket and is
> supposed to support both processors.

It should be fine.

Any Intel or AMD CPU made in the last 15+ years intended to run
Windows will also run FreeBSD.

Worst case, on some lower-spec CPUs, only the i386 version of FreeBSD
will work, which restricts you to a maximum of 4 GB memory (among
other things). In contrast, the amd64 version has practically no
memory limit.

Most modern CPUs made since 2006 will run both the i386 and amd64
version of FreeBSD.


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