The Z80, the core of the MSX Computer, is used for many, many other purposes and therefor the best-selling CPU ever. According to Zilog, this processor was used in over a billion end-use devices world wide. One of those devices is the Nintendo Gameboy. On this website, a Gameboy was heavily modified, adding a harddisk. After freezing both the harddisk and processor at -10 Celcius, they succeeded running the Z80 at 99MHz. Not bad for a processor from the 70's! The gameboy was still capable of running Tetris, but after pushing start things would go so fast, that the Game-over screen instantly appeared. As far as we know, this kind of overclocking has never been attempted on MSX, probably because the VDP would slow the system down anyway. There are however many MSX2 computers that run on 7 or 8 MHz, and there are some people who have upgraded their turboR to 40MHz. The latter already needs some modifications to keep the VDP working.
Relevant link: Z80 at 99MHz
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