atom – Best for the Intel ATOM CPU family.

centrino – Built specifically for the “Pentium M” processor, which is essentially a modernized P3. Use this if you have a Pentium M, Centrino, or Celeron-M that's based on a pre-P4 architecture.

core2 – Newer Intel multi-core CPUs, including quad-cores, i7's, and recent Xeons.

k7 – Any 32-bit AMD Athlon, Duron, or Sempron CPUs.

k8 – AMD64, 64FX, 64-bit-capable Sempron, Turion or Opteron CPUs.

p3 – Optimized for Katmai, Coppermine, Coppermine-T and Tualatin Pentium 3 processors.

p4 – Any Pentium 4 or P4-based Celeron CPUs. Optimizations for newer P4s such as the Prescott are also included, but not required for this kernel to work on your system.

phenom – Recent multi-core AMD CPUs such as Deneb, Heka, Agena, and Toliman.

prescott – Built specifically for Prescott or later Pentium4 CPU's before the Core2, such as the Pentium-D.

x2 – Early multi-core AMD processors such as Manchester, Toledo, Windsor, Brisbane, and Kuma.