Quote from: patnor1011 on May 29, 2013, 07:05:47 AM

I noticed few people mining with insane speed like 140.000 kHs, can anyone share or suggest what they may use - is it some special equipment or just tens of computers with a lot of cards in each....

I'm wondering too. The (back of a napkin) math looks like this:
140,000 Khs / 650 Khs = 215 7950s or about 200 7970s.
So one of 3 things is going on.
1) It's a serious miner farm. At ~ 200 watts per 7950 he's drawing ~ 43,000 watts 0_0
2) Someone has made some custom hardware and kept remarkably quiet about it.
3) It's a bot net.