Everything's tested for hitting at least 220GH at 400MHz across 24 hours before it ships. Peformance beyond that is expected but not guaranteed.
Weird they're underperforming at 400. Have you any kind of meter with which you can read the core voltage? Factory is 1.48V from the USB jack to the marked side of the block in the top half center with the stick plugged in but not hashing.
Hi, I'm new to the forum, but not to hardware and mining.
I have:
- 18 of Compac-F sticks.
- 2 x 30 port industrial USB hubs with 300W PSU (60A/5v) each, so plenty of power. (600W or 120A/5V)
- Each hub has 15 ports that run on single USB (2.0) cord, 2 cords per hub, so I have 4 cords (but have been plugging in the second cord into the other side, so I only run 2)
I have measured the consumption/voltage on the sticks and they go up to 3A/4.8V per stick at 500Mhz.
The PROBLEM is that I cannot run all 18 of them at once on my Raspberry Pi 4 (with the latest cgminer, your version)
I ruled out that PI is a problem. It can run 10 or even all on ONE (either) hub with no problem (I run 9/9 these need spacing for cooling),
but when I plug in the second hub, cgminer only sees 11-13 sticks max. PI CPU doesn't go over 60%, memory consumption is low too, so its has something to do with USB?
I have tried different usb cords/sticks configurations etc....it must be some kind of USB restriction?