FISTERS 400KHz 3 Axis Mach3 Motion Control Card USB 2.0 CNC Interface Breakout Board for stepper motor Support all versions of Mach3,Supports 3-axis linkage. Support system: Windows XP, 2000, Vista, 7. (not including Mac OS) Support XHC series of wireless electronic MPG, such as WHB04 MPG. Maximum step-pulse frequency is 400 KHz, can connect servo driver and stepper driver. Maximum step-pulse frequency is 400 KHz, can connect servo driver and stepper driver.