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Topic: Adding second 7970 lowers hash rate of first (Read 649 times)

hero member
Activity: 622
Merit: 500
www.cryptobetfair.com
"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
hero member
Activity: 820
Merit: 500
800 watt corsair.

950core and 1375mem lowered the second gpu to 500 and the first to 400. Same with 950 and 1500
hero member
Activity: 622
Merit: 500
www.cryptobetfair.com
try the gpu at 950

What is your PSU?
hero member
Activity: 820
Merit: 500
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
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