Quote from: Silvano on February 12, 2014, 11:53:41 PM

Quote from: ivanlabrie on February 12, 2014, 11:46:13 PM

Quote from: Silvano on February 12, 2014, 11:25:37 PM

@carly200

i made accurate counts.
results for R9 280x are very different from the results of 7950.

in my counts, 7950 is preferable to run undervolt like my own, if day profit is under 11.09$ per Mhs
instead, for R9 280x is preferable to run undervolt only if profit day is below 6.69$ per Mhs

for this counts i use this data:
hd 7950 (mine) undervolted @ 520 khs per 135w, overclocked @620khs per 275w
R9 280x (the one of a friend rig) overclocked @760khs per 308w, undervolted @575khs per 153w (take data from the "save money 7970 thread" here)
costs of power: 0.2443 euro kWh. (i pay this in Italy)

A 7950 draws 160w undervolted at 0.962v...and pulling 660-700kh/s with an optimized bin file and sgminer.
You should read this thread: https://litecointalk.org/index.php?topic=12369.0

i know "theStilt" thread. i have optimized CL file for sgminer 4.0.0
i not use for now special bios whit mem optimized by theStilt because i just use memclock @800 which is a right optimized step.
i will try to run my 7950 at 660/700 (my max was 630) and i will try those bios, if really consumption is 160w, that is wery better than my actual setup. i will see and report.

I've tried it and 620kh/s was at 160w with 0.962v. 660-700 would make it draw slightly more, but it will still be around 180w max.
I'm in the process of switching to R7 240 4GB cards, and some nvidia stuff for yacoin, ultracoin and variable N factor coin mining (scrypt asics will make the old school radeons useless...they are not so good at scrypt-jane and draw 10x the power the r7 240 draws...)

At the wall I get 20% more cause of the psu btw.