Have you bought the Gecko drives, if not why not stick with Leadshine drives (are you sure you have blown them up).

Re the power supply the Gecko drive with take up to 80V but I would keep it down to around 70V. Something like http://www.zappautomation.co.uk/elec...er-supply.html or find one with a little more amps .

Have you got two motors on one of the axis if so will the Pdmx board support slaving?