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Hello,

I've been running a ML2 for about 2 days, pretty much at stock settings (upped freq to 620) on a macbook pro usb3 port.
It has been running stable for that time, but suddenly the hashrate dropped to 2.1 - 2.5 MH, it used to be stable at 3 - 3.2 MH.

Am I missing something right here? My setup didn't change (no other devices attached).

For stable 3 MH you will need more than 500 mA. Can macbook pro usb port suplly current more than that?

I have no idea, I can only tell what I saw these last 2 days.

This is what system info says

Current Available (mA):   500
Current Required (mA):   100
Extra Operating Current (mA):   0

Apple docs:

Apple computers equipped with USB 3 provide up to 900 mA (milliamps) at 5 V (Volts) to most Apple USB peripherals as well as all third-party USB peripherals that comply with USB specifications.
https://support.apple.com/en-us/HT204377

According to docs, it can provide from 500 mA up to 1100 mA, depends how much attached device is in some way compatible with oem apple devices. Try to lower clock speed @540... Dropping hasrate is usually all about lack of juice from usb port...

EDIT: 620 is not available clock speed listed on first page.

oh wow..
Must be a typo, I'll see what fixing this does.

Thank you.

It's on 625 now, but it seems it doesn't matter much. I used to get 3.2MH on 600 and stock settings, but hey better than nothing Wink

I'm mainly doing this to support and because I'm interested in it, not to get rich.

It is getting worse and worse from now on. It has drops to 1.5MH.
Frequent unknown responses, restarts,..

I have to lower my freq everyday, while it was stable the first 3 days, something definitely is wrong.

Screenshot: https://www.dropbox.com/s/mce5t24ee1w4yu1/Screenshot%202018-02-21%2008.35.11.png

I think you should decrease Vcore to 0.65V. Read page #34 of this thread up to post #669.

Yea to get under 1A and stable operation off a standard computer USB port your going to need to lower the voltage and run under 600 MHz.

I lowered it to 540 freq and around .65 core voltage, went well for 2 days. Then the same thing resurfaced.
Multiple errors, but now the hashrate goes even lower ex. 1.5.

It might have been something with the assembly of the ML by the distributor as the large heatsink with fan came loose (heat?) and I had the put it back.
It was already average assembled from start (fan and heatsink were pretty much off target by 0.5cm Wink

)

I can't even let it run for 30 minutes now on low freq and voltage or the glue/paste starts to go soft and as I ran the thing horizontal the fan and heatsink would just fall down.

I'm not much of a hardware guy so I'm trying to explain the things as I see them

Thank you!