Old picture but this is still what I'm running. 10 Compacs on a single 10 port A-300 hub I believe it's a relabeled https://www.amazon.com/Sipolar-USB2-0-Bitcoin-Indicator-Powered/dp/B01K4LYX7U/ref=sr_1_1?ie=UTF8&qid=1486327095&sr=8-1&keywords=sipolar+A-300

$5 Purex 120mm case fan using a home made dc barrel to molex adapter 12vdc wall wart powering a $5 evercool single fan controller.

RasberryPi3 is now updated with Pixel and I followed Jake36 post to install novak's cgminer-gekko-rev2.

I heard those hubs broke pretty easily some time ago (don't remember when or where I heard that). Good to know that someone on the forum runs one of these hubs, once I get a few 2pacs and bit fury sticks I might consider this or the superbpag. Voltage is a little low on each port (5v600ma) compared to the superbpag but otherwise good; these also sell on eBay.

I can't even remember when U2s were still available, I started mining actively back when the U3 was still on sale and when you could easily get a Block Erupter for five bucks and shipping. Those were the old days.. Looks like a nice hub, illl consider it once I get my sticks

You should be able to. Superbpaq supplies 2A for each port and works well with RPi.
You can push an original compac to somewhere around 340Mhz under 1.95A.

Put the USB 3.0 hub into a non powered usb 2.0 hub. That is how I go my Orico A3H10 BK to work. Could not plug it into my powered Orico USB P10-U2-PK

I know I saw one picture of a Hub that had been opened up, and and additional +5V and GND wire had been soldered on top of the thin trace already present on the PC board. The idea is that the thin trace would have too much resistance and would cause a larger voltage drop when more current is drawn.

There were a lot of posts on this in the latter half of 2013 and early 2014 when USB miners were popular.

My attempt at upping the power to my soon to be arriving 2pacs on the cheap. I'm reusing stuff I already had on hand.  I am waiting on my Block Erupters to sell on eBay to reclaim a 5v 40 amp led "meanwell" power supply. My plan is to use Monoprice usb extenders and some 18GA wire to hook up the power of the meanwell and data of a cheap 10 port hub (also hooked up to the meanwell) I hope to get these guys running at 3 to 3.5 amps per.

I slice the jacket and remove the red and black wire (verifying that they are the +5 and ground on the usb ports) Cut the red wire and cap the side coming from the usb hub. Solder in the new 18GA wire +5 and ground cables. Verify no shorts and wrap the solder joints on opposite sides of the usb cable.

https://i.imgur.com/fMiqMC5.png

https://i.imgur.com/HFSVzpa.png

I cut some 3/4 wood dowel and using a saw and 1/2 drill bit made usb "Holders" they are spaced 2" apart to allow cooling.
I plan on attaching these to the board that my power supply is mounted to and using hot glue attaching the usb "holders" to the wood dowel.
And then attaching cooling fans.
Will Post more pictures when I get it completed. Just wanted to throw this out in case it helps others.

Awesome! Thanks for that, I remember reading that somewhere before but forgot all about it.

What gauge are those USB wires?
I know it is a short distance, but will they carry the 3.5 amps without getting too hot?
I would guess they are only 28awg or 24awg.

I started looking for some cables to do this with and the biggest wire I can find is 22awg:
https://www.amazon.com/Sabrent-22AWG-Extension-Cable-Female/dp/B017XVCK7O

Thinking about just getting some of these:
https://www.amazon.com/Uxcell-Female-Socket-Connector-Pieces/dp/B00H51E7B0/
and making my own wires/hub assembly.

Yeah, I think I am going to try to keep things less than 3 amps. I don't think the little extra hashrate will make up for the additional cost to construct something that can handle more than 3 amps.

Keep us updated. Hoping to get my 2Pacs by the end of the week.