Quote from: lanegg on March 25, 2017, 04:13:27 PM

Quote

If you intend to stay at 250MHz, you can turn the potentiometer lightly clockwise until the HW error on that stick stop increasing.

That fixed the HW errors. They are now 0 after running for about 10 minutes. I also backed the throttle down to 225MHz. I have a little USB fan cooling the devices but right after I posted my first reply I got a seg fault that crashed Raspbian and had to hard reboot it ('reboot' command wouldn't actually reboot it, it would just hang). I am not sure if they are related but since I had the devices hashing all night @ 100MHz without issue it seems too coincidental to not be the cause. I'll keep an eye on it for sure.

Quote

try turning it to 12o'clock.

I definitely don't have 20 year old eyes anymore but it looks like the dial on the pot has two flat sides. Are you saying I should turn it nearly half way? Clock or counter clock-wise? Is there a way to check what the actual wattage being pulled is (like in the USB management)? I didn't see it on a cursory glance but maybe its something that can be calculated?

Thanks for the support guys!

Checkout Biodom's post https://bitcointalk.org/index.php?topic=1764803.msg17678108#msg17678108 on where to measure the voltage.

You can use one of these guys to measure power-draw

Search ebay/aliexpress for "usb voltmeter amperemeter/ammeter"

Edit: Forgot to mention, vcore of about 1.5V should get you close or slightly above 300Mhz but you'll need proper cooling, that's for sure. These guys get very hot.