On Sun, Sep 28, 2025 at 11:59:09AM -0400, Felix Miata wrote:
Michael Stone composed on 2025-09-28 11:51 (UTC-0400):On Sun, Sep 28, 2025 at 10:01:05AM -0400, Felix Miata wrote:If it's an IBM compatible PC or laptop, boot into BIOS setup. Odds are, if you see EFI mentioned anywhere, the CPU is 64bit, but somewhere at least there will be some indicator of bus width.There were definitely 32 bit x86 machines with EFI so I would not advise using that as an indicator.Hence, "odds are"..."but".
If you want to play the odds, just assume if it's from the last 15 years it's probably 64 bit. (Heck, if it's more than 10 years old there's a good chance it won't have EFI even if it is amd64; EFI just isn't all that useful an indicator.)
Best only if the installed OS boots.
If it doesn't boot this is all navel-gazing.