Regarding mining, I don't think people are very cost-efficient in how they setup their mining rigs. There's too much "I want to get the best there is" mentality floating around which increases CAPEX cost significantly (for less OPEX of course - but IMO it's not worth it unless the electric costs are too high). The fact that people are buying brand new 280s/290s and pay thousands of dollars from the get go is a bit disturbing.
Clocked 5850s and 6870s are pulling like 1.3 MHs and people can find used ones at around 100$ per card instead of 500-600$ for a brand new 290. Will a 290 give 5-6x performance? Nope.
Clocked 5850s and 6870s are pulling like 1.3 MHs and people can find used ones at around 100$ per card instead of 500-600$ for a brand new 290. Will a 290 give 5-6x performance? Nope.
For howmany Watt ?
They are close to 170-190w clocked for scrypt, but DRK power use is another issue altogether (much reduced).
Thing is, when you get 2x6870s or 2x5850s and have more hashrate than a 290, you also keep 300-400$ (2x100$ vs 500-600$). Now, with those 300-400$ you can buy A LOT of kwatts (400$ / 20cents per kw if one is on an expensive power network = 2 Megawatt-hours already paid due to the price difference).
Not realy clear for me.
can you give kh/s and watt per card please
Hashrates are about 1200-1300 khash/card for clocked 6870s and 5850s. Power consumption, with scrypt coins, is near the max of the cards at 170-190watt. Power consumption with dark is unknown because dark consumes less power and I haven't measured it. It is however significantly lower (as one can hear from the fans, or see from the temps) than scrypt.
