But people have 250 kHash,2.500 kHash how is this possible
Your on http://digitalcoin.scryptmining.com , yes? If so, and you're referring to the KHash reported on the site, don't worry about it The site isn't currently reporting it correctly, but as it mentions, its a display only value anyways. The site only cares about shares in terms of paying you coins. I'm in the process of trying to get it fixed up, but don't worry too much, as long as your client is showing a decent rate and not too many stales, you'll be paid out as you'd expect
if on the other hand, your client is only reporting 2.5KHash, well, if your GPU mining, you may have a problem!
ı am mining with GUIminer so GPU mining and i only got 0.007115 DGC this is so low ?