Plummeting RAC

Questions and Answers : Macintosh : Plummeting RAC
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Joined: 14 Feb 00
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Message 1819972 - Posted: 26 Sep 2016, 20:38:50 UTC

I have a 2.8 Ghz quad core iMac with an Iris Pro GPU. On 9/17 I reached 7000 RAC running 3 cores at 75% + the GPU. I then turned off the GPU and ran 4 cores at 75%, I lost 200 RAC in 6 hours. So I went back to my original settings but I’m still losing RAC, I’m down to 6,500 RAC as of 9/26.
One thing is different I stopped taking Astropulse, could that make that much of a difference? Another thing I noticed is my ‘Validations’ are 103/65 that seems a lot higher than before but I didn’t keep track of those numbers.
I updated the Boinc app each time I made the web preference changes. I’d appreciate any help.
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Message 1819987 - Posted: 26 Sep 2016, 21:40:41 UTC - in response to Message 1819972.  
Last modified: 26 Sep 2016, 21:41:13 UTC

Turning off astropulse isn't going to have much if any affect since they are so rare and few and far between.

Not using your GPU is more likely to affect your RAC as it take the GPU about 1/3 of the time to do the same work as a CPU core. ie..

What your 3 cores do in 1 hour and 30 minutes, you GPU can do the same amount in that same time.

So it's like a 6 core doing the same amount of work in 1 hour and 30 minutes. Quite an eye opener isn't it.

RAC is an average of about 6 weeks worth of work, so it will fluctuate over time. Depending what your RAC is,sometimes a small change in daily production will affect it

Give it a few days and see if the RAC comes back up.

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Questions and Answers : Macintosh : Plummeting RAC

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