Updated on my hubs

I now have 3 hubs operational with 23 miners in total, 18 on my PC, 5 on my RasPi.

Power consumption of Raspi + hubs + miners + PSU less what is being leeched from the PC is 40W (or so my Watt Meter tells me, but I don't consider it that accurate...)

Hubs US$9.50 each (DX Bulk price FTW)
PSU US $34 (not from DX, sourced
DC plugs and cable US$5
Not burning my fingers soldering US$priceless

Once I have four hubs going, that's a total of $77 for 36 ports, or $2.14 per port - though I am tempted to limit the total used to ~32 to not stress the PSU (17A including the RasPi, out of 20A max), so maybe $2.41 per port.

Improvements to make - ~6A polyswitches for each hub (10 for $4 on ebay...)(the hubs have no over-current protection!), convert some more of my 30cm USB extension cables to power isolation cables, power the RasPi directly from the PSU, not from a hub.

Pics:
Hubs, Duct, PSU, RasPI.  The black power brick is providing the 12V for the Fans.  The PSU is now running very warm to the touch (still far cooler that an USB Erupter) with the extra 5 miners and RasPi.  Is was only warm before add that extra load.



miners all cosy in the duct.