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[JAZZCNC]

UC have a USB or ethernet solution, Jazz was comparing using a PC with PP for step generation. UC cards are step generators. It gets confusing because like me nr1madman is using a cheap PP BOB to connect to the steppers, switches etc.

but the connection to the PP BOB is running a lot faster than if it was a PC PP. A few people have warned that using that cheap board will limit upper performance but I was told you will be able to run at least 50khz per axis with that cheap board connected to a step generator if you need more you need a better breakout board. For my Mesa card it's £100 for the better BOB so I'm happy to use my existing BOB for now and 50khz is actually a lot depending how you set microstepping.

There's more to it than just speed. Best way to I can relate it is to compare to HIGH end HI-FI Amplifier. You wouldn't dream of fitting cheap speakers to quality Hi-Fi because it would just degrade the sound and make it sound rubbish.

Cheap BOB is just like cheap speakers, your putting clean quality pulses in and the rubbish circuitry is degrading what comes out. Still comes out at same or similar speed but now it's all noisy and crackly.! . . . . Defeats the point of External controller..IMO.

The quality of the pulses you put into drive directly affects how smooth the motors work and it's clear to hear the difference when have bad setup.