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> a Pentium 4 Prescott RK80546PG0881M > ... and running a 32-bit Linux Server Out of curiosity and I don't even remember: wouldn't that CPU already support 64-

• bombcar 3y ago
  It should, but it's early enough you might have to custom-compile to fully utilize it. Also 32bit (or 32bit with weird memory features like EM64T) may be significantly faster because of the smaller memory access sizes. Or weird hybrids with 32bit addressing and 64bit extensions.
• happycube 3y ago
  I think Socket 478 Prescott was 32-bit only, except for a very few S-specs that were sold (mostly?) to Lenovo.