Don't know if this helps but if you use after burner see if boost is on in after burner . not sure if 280x have that my 280 not X does and having it on lower speeds on mine but it's only one card and 280 not the X and disable ULPS
my 280 not X
one card with boost off and disabled ULPS . no over clocking.
ZEC - Total Speed: 47.000 H/s, Total Shares: 3174, Rejected: 17, Time: 09:31
Topic: speed decrease when Mining in parallel mode(ZEC) (3x R9 280x) (Read 839 times)
Bios of VGA or MB ?
maybe its NUMA settings in your bios?? google NUMA memory nodes
hI,
I have the following problem: I have 3 video cards, two XFX R9 280X and one Sapphire R9 280X OC.
I'm mining on ZEC. When I have all three video cards running on Clymore MIner, the result of two XFX R9 280X is 42 H/s & 43 H/s
And the result of Sapphire R9 280X OC is 32 H/s (to be considered that this model is better than two others)
When i'm running only Sapphire R9 280X OC - the result is about 45 H/s .
What is the problem? Why does the speed decrease when running in parallel mode? How can I settle this?
I have the following problem: I have 3 video cards, two XFX R9 280X and one Sapphire R9 280X OC.
I'm mining on ZEC. When I have all three video cards running on Clymore MIner, the result of two XFX R9 280X is 42 H/s & 43 H/s
And the result of Sapphire R9 280X OC is 32 H/s (to be considered that this model is better than two others)
When i'm running only Sapphire R9 280X OC - the result is about 45 H/s .
What is the problem? Why does the speed decrease when running in parallel mode? How can I settle this?
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