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What is the best driver version to mine etc or eth in AMD 7950? I am asking the question in different thread but no one replied.

The one that gives you undervolting capability with Afterburner or Trix. 15.7.1 works for me.

How to undervolt and is it safe for my gpu? What should i expect from a single and 7950 gpu in eth mining now?

Undervolting is totally safe and it even brings down the heat and power usage. I am getting 15Mh from a 280X, I think you can expect anywhere near that since it's the same chip.

I have R9 280x. How much can I undervolt ?

You can run at 950 mV and 850 MHz. It depends on the quality of the card. That is more or less ballpark figure.

850 MHz with GPU Clock or Memory Clock ? I have 1070/1600MHz default values.

850MHz will be with core clock. The memory clock has to be 1250 MHz to have proper speed with Claymore miner.