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for squeezing more, you need to overclock your cpu ("K" means that you can).
i5-4690K max GHz are 3.9
ref: http://ark.intel.com/products/80811/Intel-Core-i5-4690K-Processor-6M-Cache-up-to-3_90-GHz
You could try to use intel turbo boost be careful when doing this operation
I've found a guide on youtube:

Thanks, I'll check it out. By the way, what are the advantages of being a witness, instead of just regular mining?

you can find more information here
https://bitshares.org/technology/delegated-proof-of-stake-consensus/

Each time witnesses produce a block, they are paid for their services

but I really don't know how

how much steem to mine per day on average?

I've only been running 1 day :)
I found 1 so far! haha

I can get 1-4 SP per day with 30Khps, but the diff is increasing :(

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