Re: Consolidated Litecoin Mining Guide for 5xxx, 6xxx, and 7xxx GPUs
So I had all 4 cards running in my case, but with them being all crammed together, it was way too hot. So I pulled everything out and sat it on a rack. I have 2 of the cards plugged into the board, a 3rd card plugged in via 16x riser cable, but couldn't get the 4th card to work with another 16x riser cable. So, I ordered a 1x to 16x riser cable and hopefully this will solve my problem.
In the meantime, I'm running 3 cards and getting pretty nice hashrates. These are my settings and results using cgminer 2.11.3 and AMD Catalyst 13.1 drivers:
--intensity 13 -g 2 715/710 = ~1500Kh/s
--intensity 13 -g 2 925/1000 = ~1950Kh/s
--intensity 13 -g 2 1000/1206 = ~2100Kh/s
--intensity 13 -g 2 1022/1244 = ~2150Kh/s
Other settings:
--thread-concurrency 8192 -w 256
I've literally spent most of a entire week playing around with settings and trying to find the sweet spot and I feel like I'm pretty much there. As you can see, I actually underclocked my cards to get these hashrates. Stock clocks are 1100 core/1500 memory. Unfortunately the default voltage is about 1.2 volts on my cards and its locked (@#&($$^(@&$!!), otherwise, I'd be able to save 100-150W easily by undervolting.
http://i.imgur.com/rzwfhgI.png
I'm seriously thinking about getting rid of these cards and getting 7950s or 7970s that don't have the voltage locked. Having the voltage locked is such a huge drawback, I'm just wasting too much power right now.
In the meantime, I'm running 3 cards and getting pretty nice hashrates. These are my settings and results using cgminer 2.11.3 and AMD Catalyst 13.1 drivers:
--intensity 13 -g 2 715/710 = ~1500Kh/s
--intensity 13 -g 2 925/1000 = ~1950Kh/s
--intensity 13 -g 2 1000/1206 = ~2100Kh/s
--intensity 13 -g 2 1022/1244 = ~2150Kh/s
Other settings:
--thread-concurrency 8192 -w 256
I've literally spent most of a entire week playing around with settings and trying to find the sweet spot and I feel like I'm pretty much there. As you can see, I actually underclocked my cards to get these hashrates. Stock clocks are 1100 core/1500 memory. Unfortunately the default voltage is about 1.2 volts on my cards and its locked (@#&($$^(@&$!!), otherwise, I'd be able to save 100-150W easily by undervolting.
http://i.imgur.com/rzwfhgI.png
I'm seriously thinking about getting rid of these cards and getting 7950s or 7970s that don't have the voltage locked. Having the voltage locked is such a huge drawback, I'm just wasting too much power right now.
I'm amazed that you can get over 700kHash with those clocks
I managed to get 665kHash with 988/1244, but just can't manage 700+ without going 1700+ on memory clocks. Catalyst 13.1 just crashes on CGMiner 2.11.4, so I'm using 13.3 beta3.. perhaps I should try the older cgminer?