If you're using a 32-bit AMD/Intel CPU (Pentiums, Athlons, Durons, etc), then you'll want the i386 ISOs. You'll be able to use a 32-bit distro on a 64-bit machine as well. If you have a 64-bit CPU and want to use the 64-bit version (Athlon 64, etc), then you want the x86_64 ISOs. PPC ISOs are for machines with PowerPC CPUs.
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