New alltimehigh khash! TheStilt BIOS + PSW kernel
1) I got a TheStilt optimized BIOS, and tried it out;
2) then modified it myself to enable undervolting (like in posting #45), and flashed that into my card with atiflash.
3) upped the thread-concurrency from 8192 to the supposedly magical 8193,
4) replaced the scrypt130511.cl by a modified Scrypt kernel by psw, and
5) tried out many, and found the undervolted settings ... CC=1054, MC=1500, V=1.065V ... to give the highest khash, stable at lowest voltage.
6) System has been running loud but well for more than 27 hours.
7) So now I report back :-)
GOOD news: I could get up to beforehand unreachable 720 khash/s. That is 28 khash more than with my best unvervolted-overclocked settings (B) - very nice gain of 4% hashpower = that's like a bonus of 9 euros on the 229 euros purchase price of the 7970 GPU.
BUT:
And most importantly, the resulting 720/275 = 2.62 khash/Watt are less optimal than my settings (B), and much worse than at my so far best sweet spot (C) with 3.78 khash/Watt.
So:
Unfortunately, all these changes did not give more khash or less Watt for that sweet spot (C) underclocked undervolted CC=854, MC=799, V=0.893 settings. So TheStilt-BIOS (plus 18khash) and the PSW-kernel (plus 10khash) ... which help to push up the upper limit of khash/s ... at the expense of more juice ... are good news for (miners who steal electricity or) miners in countries like Egypt, Kuwait, Saudi Arabia, Bhutan, Iran, Pakistan, Russia, Nigeria, Ukraine, Venezuela, Argentina, Myanmar, Surinam, Serbia, Macedonia, Thailand, Uzbekistan, Jordan, Canada, Korea South, Vietnam, Dubai, Taiwan, Malaysia, Nepal, China, Paraguay, India, South Africa, or ... United States.
For the rest of us, especially in the the cleaner countries, the old optimum (C) "undervolted underclocked sweet spot" is still the best.
Keep on optimizing!
P.S.: Let's spread the word, imagine the altcoin network starts saving 1/4, 1/3 or even 1/2 of electricity.
1) I got a TheStilt optimized BIOS, and tried it out;
2) then modified it myself to enable undervolting (like in posting #45), and flashed that into my card with atiflash.
3) upped the thread-concurrency from 8192 to the supposedly magical 8193,
4) replaced the scrypt130511.cl by a modified Scrypt kernel by psw, and
5) tried out many, and found the undervolted settings ... CC=1054, MC=1500, V=1.065V ... to give the highest khash, stable at lowest voltage.
6) System has been running loud but well for more than 27 hours.
7) So now I report back :-)
GOOD news: I could get up to beforehand unreachable 720 khash/s. That is 28 khash more than with my best unvervolted-overclocked settings (B) - very nice gain of 4% hashpower = that's like a bonus of 9 euros on the 229 euros purchase price of the 7970 GPU.
BUT:
- The fan is faster. No more silence :-)
- Temperature is higher, at ~74C
- Electricity consumption is 275W (that is 275W more than with (g)pu (d)isable)
And most importantly, the resulting 720/275 = 2.62 khash/Watt are less optimal than my settings (B), and much worse than at my so far best sweet spot (C) with 3.78 khash/Watt.
So:
Unfortunately, all these changes did not give more khash or less Watt for that sweet spot (C) underclocked undervolted CC=854, MC=799, V=0.893 settings. So TheStilt-BIOS (plus 18khash) and the PSW-kernel (plus 10khash) ... which help to push up the upper limit of khash/s ... at the expense of more juice ... are good news for (miners who steal electricity or) miners in countries like Egypt, Kuwait, Saudi Arabia, Bhutan, Iran, Pakistan, Russia, Nigeria, Ukraine, Venezuela, Argentina, Myanmar, Surinam, Serbia, Macedonia, Thailand, Uzbekistan, Jordan, Canada, Korea South, Vietnam, Dubai, Taiwan, Malaysia, Nepal, China, Paraguay, India, South Africa, or ... United States.
For the rest of us, especially in the the cleaner countries, the old optimum (C) "undervolted underclocked sweet spot" is still the best.
Keep on optimizing!
P.S.: Let's spread the word, imagine the altcoin network starts saving 1/4, 1/3 or even 1/2 of electricity.