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Old 2016-01-21, 07:43   #1
Ammonia
 
Jan 2016

116 Posts
Default Low clock speeds on Mersenne Prime search

I'm new to this, just downloaded the software a few hours ago and thought I'd try looking for some primes! I have a 12-core Intel Xeon E5-2690v3 with a rated clock speed of 2.6 GHz. I set up 10 workers on 10 CPUs (multithread), allocated 16 GB.

The problem is, when the software is running all the cores are running at a rather low clock speed of 1.8 GHz max. When I use the same software but run the benchmark instead, I get 2.8-2.9 GHz on all cores (stable, over days).

Power saving options for the CPU is turned off, there are no thermal throttling.

Anyone able to help me with the settings to fix this? Or is this normal?
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