What Kernel for an AMD XP?

[hypernatic.net]

I have RedHat 7.2 currently installed,
and on the RedHat FTP under updates I see a few different kernel upgrades... Which one should I pick? And why?

I have an AMD XP 1700+
Updates for:

• Athlon
• i386
• i486
• i586
• i686
• ia64 (what is this??)
  [/list=A]
  
  Thanks!