Quote from: mvdgeijn on January 09, 2014, 08:59:11 AM

Yesterday 3 antminers arrived. Immediatly set the frequency to 375, all working OK. Now I've set one to 400. I noticed that the processor is 100% used. Isn't that the main bottleneck?
Marc

If you ssh into the S1 and run top you can stare at the process' cpu usage and pretend it is an aquarium.

But as you mentioned, cgminer definitely appears to be utilizing the majority of the cpu. I have seen mention of this in various Bitmain threads but ATM don't have links queued up.
I would guess that this utilization stays fairly consistent (although excessive) through at least the 350 MHz - 400 MHz range.
You have 3? Lucky.

How about setting one at 350, 375, and 400 and start up the aquariums and telling us what you see?