Because the Mayumi v4 uses the timing coming off of the PlayStation 1вЂ™s board, instead of the internal PIC oscillator (like the MM3 uses) it can boot games more reliably. The Mayumi v4вЂ™s greatest strength is its reliability. This guide aims to solve the information problem once complete. IвЂ™ve also noticed that there is much less information about Mayumi chips online, and fewer places to buy the chips. Since this is the clock pin for the chip, itвЂ™s very susceptible to interference which can make it a trickier chip to install. In particular for most PS1 models pin 2 isnвЂ™t required, but it is for the Mayumi v4. Mayumi v1.1 chips are compatible with those older PU-7 and PU-8 boards, IвЂ™ll be making a guide for those chips in the future.ДЄnother small downside with the Mayumi v4 is that it typically involves installing more wires than other chips like the MM3. First of all it isnвЂ™t compatible with every PlayStation 1 model, so if you have an older console youвЂ™ll need another chip.

There are a couple of downsides to using a Mayumi v4. I thought the Mayumi V4 wasn't compatible with the 100x models.ДЄll SCPH-5500, SCPH-5501, SCPH-5502, and SCPH-5503вЂ™s

Psx mm3 modchip install scph 5501