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I'm running on a 15" Retina MBP and have just been playing around with mining on it a little bit. I realize GPU mining is almost dead at the moment, but bear with me.

Overnight last night I was running the BitMinter Java client and getting around ~20Mh/s. I fired it up again this evening, and for some reason, am now only getting around 5Mh/s. I'm seeing the same rate on both the BitMinter java client as well as with cgminer. Nothing has changed on my system over the last day other than having to reboot it a few times for other reasons. Does anyone have any idea why my Mh/s output rate has fallen so much?

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This isn't one of those Macs with two GeForce GPUs, is it? They run the slower GeForce when running on battery, to save power. If power saving is turned off they can actually mine on both GPUs. –  Dr.Haribo Feb 23 '13 at 13:50
    
It has 2 GPUs. A 650M and the Intel HD4000, but the 650M is always active when a miner is running. In fact, even switching it so that the 650M is always in use causes no difference. –  Grant Limberg Feb 23 '13 at 21:20

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up vote 3 down vote accepted

I think I figured out my own issue here. I reset the SMC on the macbook (http://support.apple.com/kb/HT3964) and my GPU performance is back to normal.

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