I am thinking about mining Monero (cryptonight R). I have 3 290x gpu's. My electricity is about 12 cent. As far as I can see profitability will be weak to say the least, should I wait for Monero to rise in value or would the hashrate kill of profitability anyways??
Beyerd, I ABUSED 6 290x/390 , had two near new 290x gigabyte, one had the VRM burnt for some reason (this one was unstable anyway, think the gpu had a grit of sand from factory and heat damagge happened probably with first user)
The other with the Stilt Bios and timings mods, used to do REALLY low reading, fans run lightly, it gave around 90 watts total in HWinfo mining v7 CN back in the day.
What i would do is go 1000 mhz only and undervolt-experiment (every miner is different) sometimes it can take -200 mv, the stilt bios changes VRM frequency which isa hard tweak, however they really ran with less energy. used to do 900 h/s back in the day.... also i know what to be done with the timings for polaris but with this 290x, you need to underclock and tweak timings specifically as hell for cryptonight, what works well for Cryptonight always is, lower tRD and tRC, higher tCL and consequent timings, loosen tRFC substantially and bump Rasmactwr mainly and rasmactrd. try with 1000 mhz memory speed with tight timings and start overclocking memory, no errors, then maybe tighten more.... elpida in polaris does miracles at lower speed than even 1750 mhz with proper timings