I will post some tuning infos on the
http://minecoin.net website, too (changing resistor values). Basically, the hardware is prepared for dynamic voltage scaling by software. There are "only" two things missing to do that. First, one resistor must be soldered in. Second, the software has to support this feature. Haven't got the time to implement this feature.
I'm currently very busy with shipping all orders and talking with the postal service about the first 3 parcels I shipped because their status isn't updating. So, will take some time to post the tuning infos on the website.
Your shop items are showing as 4.5 5GH/s, can you confirm that this is or not the case please?
If less, please can you update the shop?
At 4.5 5GH/s I'd buy some but if they were less than advertised when purchased, I'd not be getting what I paid for...
I can confirm that all units I ship are tested and are reaching a hash rate of 4.5 - 5 GH/s if the power supply is good. Most of the devices are between 4.6 and 4.8 GH/s some are above or below this hash rate.
I'm testing the devices for at least 1 hour and if they are not reaching 4.5 GH/s they are sorted out (e.g. I sorted out a device which reached 4.44 GH/s after a couple of hours).