If you have an older Mini-ITX board based on the VIA C3 processor, you should of course select the VIA C3 instead of the C7 here. And symmetric multi-processing support (SMP) is only needed for dual Eden-N boards, such as the VIA Epia VT310DP.
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If you have an older Mini-ITX board based on a VIA C3 processor, you should of course select one of the the VIA C3 options here instead of the C7. If your board has a 'Luke' CoreFusion or Eden-N processor (such as the VIA Epia VT or EK series Mini-ITX boards), you should probably select VIA C3-2 (Nehemiah). Symmetric multi-processing support (SMP) is only needed for dual Eden-N boards, such as the VIA Epia VT310DP.