paterson, i don't agree, the dual dsp is only used on cx/i's
the others all have quad's
there is a command you can use, show status Dsp, to show whic card the fault is on. It should tell you which slot the card is in. If you look in the tech handbook on around page 36 it's show a layout of the card's so you know which one you can re-seat, replace if necessary. But in an MX it will be a Quad