for an s7? where at that price, because if that is true, it would be amazing, very cheap indeed

i would grab it without thinking, roi is in 2 months with that investment

pos is for altcoin, does not belong here, it's proof of stake

anyway it's not true that only the s7 has a reason, s5 is good if you don't mind electricity, because it cost much less and the roi is faster

s5 deliver 1/4.2 of the hash, while costing 1/6-7

Anything but S7 is a waste of time. Especially having in mind expected mining diff increase. If I were your, I do go PoS or build a rig cause SHA 256 mining for home users is the thing of the past. Unless you are a whale.

I would advise getting a Antminer S5 or Antminer S7 if you want to make some profit(It might take ~7-8 months to get an ROI) by mining.

Thanks for the hint with VanityGen.

"Vanitygen can handle any prefix too, so you could use vanitygen to create an address for any coin."

can anybody explain how to get a "2"-prefix for a groupcoin address? All I could get ouf fron VanityGen are the prefixes "1", "N", "n", "M", "m".

thanks

Great thanks for looking for confirmation on that point, and again for raising it in the first place!

To answer the other commenter, with 6 erupters at just over 2gh/s it's making about 0.04BTC per day at present but I can't realistically expect to see any ROI financially given increasing hashrates and difficulty.

You are using quite an old version of cgminer (3.1.1) here. As a heads up for any newbies reading this, this is the latest version that supports the -S parameter. More recent versions expect to communicate directly with the the USB driver, so the setup procedure is quite different. Perhaps you would like to update your tutorial with this information?