Very happy with my units! These are with stock settings a clock speed of 796 and two USB fans to keep them cool its Summer here in Australia!
My knowlage is under average, so please someone correct me, but I think this is not best setup. Your errors are well above 1% because your hubs can not supply enough power for 3 sticks at that rate. Nextium hub is power supplied with 12V/2.5A which is insufficient for 3 miners @ cca. 4.5mh/s. At post #539 @racebyu is stating he has 2.4amps power draw per one stick @5mh/s. I repeat: I have no hubs at all, have only one stick and know less than average community member.
You will see under powered usb miners drop off on the hash rate and slowly go down, that is why the rest in the new software to my knowledge.
The more current available the better these will be able to run smoothly, I have zero issues with the higher current supply and working flawless.
More current is your friend here for higher hash rates of over 3.8Mh.
Thank you for clarification. I am pulling this one with @ozcointrader's (regards) post because I have one stick but am excpecting more in February so I'll need a hub at some point and I want to be sure it can deliver 2amps per port for at least 3 sticks. I saw his post and hubs, liked them, but googling says 2.5A alltogether (so 3 of them can pull 0.8A each. Am I missing something here?) Haven't found any hub providing 2A per port bellow $150 which is a shame. For $150-$200 you can buy used PC or laptop so I can not understand what the hell is in them for that price...