3x Radeon 6870 - Low hash rate.

[minerX]

Hey guys,

I've got 3 radeon 6870s installed.  I'm running 11.5 with 2.4 SDK.


One radeon has Mh/s at 280.   

But when I install all three, all three hash rates drops to 90 per.  So total 180 MH/s.

Anyone know whats going ?

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[ensign_lee]

Are you running them independently? Or are you trying to crossfire them?

[minerX]

They are independent.  No crossfire.

[Basiley]

Hey guys,

I've got 3 radeon 6870s installed.  I'm running 11.5 with 2.4 SDK.


One radeon has Mh/s at 280.   

But when I install all three, all three hash rates drops to 90 per.  So total 180 MH/s.

Anyone know whats going ?

maybe power-saving feature of firmware/catalyst ?
try to monitor/adjust cards clocks.
90MH/s is quite low.
6870's usually got 200MH/s or about[per/unit].

[minerX]

Hey guys,

I've got 3 radeon 6870s installed.  I'm running 11.5 with 2.4 SDK.


One radeon has Mh/s at 280.   

But when I install all three, all three hash rates drops to 90 per.  So total 180 MH/s.

Anyone know whats going ?

maybe power-saving feature of firmware/catalyst ?
try to monitor/adjust cards clocks.
90MH/s is quite low.
6870's usually got 200MH/s or about[per/unit].

I'll uninstall drivers and reinstall.  Might be a bug since I just swapped out a 6950.   And I didn't see any power saving features in the catalyst.

[Basiley]

you didn't "see" such features in Catalyst, cuz its unmanageable[eside editing bios or using 3rd-party software for GPU control].
try launch MSI Afterburner and check you GPU's clock.

[minerX]

you didn't "see" such features in Catalyst, cuz its unmanageable[eside editing bios or using 3rd-party software for GPU control].
try launch MSI Afterburner and check you GPU's clock.

You were right.  Booted up MSI and noticed only 1 GPU was working.   Then I realized I forgot to change device numbers when copy/pasting the startup file.

Fail

[Basiley]

happen