The performance of a 0-X MASH DSM is primarily defined by the DSM noise-shaping and the inter-stage gain (ISG). Due to system specification like modulator order and OSR, the DSM noise shaping is limited. All further performance in the 0-X MASH modulator is achieved by setting a large ISG, which amplifies the residue signal before it is processed by the fine stage DSM. This paper presents an analysis of the factors influencing the ISG and proposes measures, which can be used to maximize it. Most importantly, it is shown, that the CIFB DSM architecture is preferred, since the wideband residue overloads the CIFF architecture with its peaking OOB STF much earlier, thus CIFB results in more ISG and less internal swings. The presented analysis can be used as a guideline for achieving optimum performance in a 0-X MASH DSM and yielding the maximum SQNR.