Title: Adding second 7970 lowers hash rate of first Post by: AndrewK on June 08, 2013, 02:13:31 PM I have been running a powercolor 7970 for a couple of months with a msi 6970 in the second slot (getting 610kh/s mining litecoin on the 7970). I just got a XFX 7970 back from RMA and decided to replace the 6970 with it.
Now I can get 610kh/s with the XFX in the second slot but no matter what I do the Powercolor in the first slot won't go much over 500kh/s. I'm using the same settings for both: 8192, i13, w256,g2,lookupgap2... etc. Clocks are at 875 core and 1375 memory. Computer has 8gb of ram... I deleted the scrypttahiti and scryptcaymen files in the folder... no luck. Any suggestions would be appreciated. Thanks, Andrew Title: Re: Adding second 7970 lowers hash rate of first Post by: laughingbear on June 08, 2013, 02:22:56 PM try the gpu at 950
What is your PSU? Title: Re: Adding second 7970 lowers hash rate of first Post by: AndrewK on June 08, 2013, 02:27:16 PM 800 watt corsair.
950core and 1375mem lowered the second gpu to 500 and the first to 400. Same with 950 and 1500 Title: Re: Adding second 7970 lowers hash rate of first Post by: laughingbear on June 08, 2013, 03:17:27 PM "intensity" : "13",
"vectors" : "1", "worksize" : "256", "kernel" : "scrypt", "lookup-gap" : "2", "thread-concurrency" : "8192", "gpu-engine" : "950", "gpu-fan" : "90", "gpu-memclock" : "1357", "gpu-memdiff" : "0", "gpu-powertune" : "20", "gpu-vddc" : "0.000", "api-port" : "4028", "expiry" : "120", "gpu-dyninterval" : "7", "gpu-platform" : "0", "gpu-threads" : "2", "hotplug" : "5", "log" : "5", "no-pool-disable" : true, "queue" : "1", "scan-time" : "30", "scrypt" : true, "shares" : "0", "kernel-path" : "/usr/local/bin" that leaves me at 670 |