Tronxy Newest Board with TMC2225 Drivers, This board comes with 4x TMC2225 drivers installed. chitu board version cxy-v8-190729 . The Firmware onboard is also newest as of 12/01/2019 , V1.4.1RC25m4 . Always backup your firmware config using pronterface use these 2 commands, M6046 I4000 "M0" (hit enter)(can change name between " " to any name .gcode )m8512 "config01.gcode" (make sure you have SD card inserted into mainboard) hit enter to save config to the micro sd card. All the X5SA PRO OSG Printers now come with this board but they come with 5 Drivers installed and firmware V1.4.1RC24m4 Installed. This is there best board to date, the Drivers sre well suited for this printer & there would be no reason to upgrade to tmc2209 or tmc5160 as the printer is at it's max printer speed of 150mm/sec out of the box with the new OSG rail system. This board is a great upgrade for older X5s and X5sa if you plan on Linear rails you should be able to print at speeds upto 150mm/sec This is a great board for the money.