1. If we look at MIPS (million inst per sec), it is calculated using what minimum time MCU will take to execue any instruction. Like for msp430g2553, min time is 62.5 ns or have 16MIPS. MCU can't run faster than that right.
2. But DMIPS are like e.g 1.25DMPIS/MHZ. How can MCU go faster than MIPS. Even if dhryatone has some code . How can it go faster than that, MCU can't solve inst faster than mips in any case