I'm running the dynamic hashvoodoo release capped at 200 on mpbm and a laptop and i've been noticing my rig doesn't like more than 17 boards connected at once. It always drops 2 random boards a few hours after I reset them. Each time one of them drops I swap out the usb cable for a new one. It's possible they aren't getting enough power, but I have them connected to a 1000 watt power supply on a 1500va/1000 watt UPS that hasn't given any warnings, and the rig only draws 950 from the wall, so i should have ~250 watts to spare. I'm going to split the rig up and see what happens over the weekend.