If you already have a RAMPS and the drivers, you might want to take a look at the Re-ARM - it's an almost plug and play 32 bit replacement for the Arduino Mega. There are some differences with respect to display connectors (it supports the RepRapDiscount Full Graphics display but you need a slightly modified cable) and the fact that it's 3.3V instead of 5V so if you have any peripherals that run off 5V like a BLTouch you might need some more tweaks, but otherwise it's a straightforward upgrade.
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