so i can't seem to get the sticks over 450 mhz
I have a gekkoscience usb hub, with 2 ports splitting 6 amps connected with a 200watt FutureBit power supply
I've put 3 into the hub and connected it to an old RaspberryPi3 got CGminer running no problem but no matter what i do i can't get them over 450mhz - according to the chart on page 3 i can go much higher than this
Did you use
kano's suggestions? Try with a lower gekko-start-freq to start with and see when it starts to fail.
Ideally connect a USB power meter to see if the power is actually being delivered correctly from the hub.
Also, are you using a good fan?, it could be overheating and failing because of that.
In any case, it's working as expected though, since they're only ensuring 400MHz:
Just as a note, all sticks are tested for a minimum of 12 hours at 400MHz and must average at least 220GH (80% speed) during this test to be cleared for shipping.
In that post are other things you can try as well:
--gekko-compacf-freq 400 --gekko-start-freq 300 --gekko-tune-up 85
which means it targets 400MHz, starts ramping from 300MHz (instead of the default 200), and will step up when the measured hashrate breaks 85% of expected (instead of the default ...90-95%?)
If it doesn't level out above 300-400MHz, that's when adjusting the volt screw could start to make a difference.
yeah thanks for this, I've already tried this - im thinking it may be my raspberrypi 3 but i am going to try to add more cooling