So the good news:

Got 3 of my 4 Compacs cranking steadily and stably at 300MHz.

The bad news:

Yeah - just 3.  One of them zombied out.  I would just figure I killed it, but if I fiddle with the voltage, it will catch low GH's but then degrade to MH's and eventually zombie out again.  But most of the time it won't hash.

Also, when I plug into the hub I don't get the nice little Win10 sound.  Doesn't matter which port in the hub or if it's by itself or not, so it's not the hub (https://www.amazon.com/gp/product/B00VDVCQ84/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1).

I even scaled back the power and clocks to 275MHz.  Still the same.  When I plug straight into a USB port in my PC tower, it DOES make the Win10 chime, but still doesn't try to hash.

Any advice - or is prolly fried?

Thanks all!