ETH mining on dual 7970s better in crossfire or individually?

[Entropize]

I've started Mining ETH and got 2 7970s installed, I ordered the crossfire bridge but Minergate picks up both cards and is hashing away on them without the bridge installed. It is reporting slightly lower numbers than people have reported that I should be getting with these GPUs. Does anyone have experience with these setups that can tell me if I'll get better numbers when the bridge gets here?

[philipma1957]

no cf needed.

 why did you buy a bridge?  


I have 20 bridges never use them as they are more for gaming. maybe 10 bridges.


how bad are your numbers?  18 each 19 each 20 each 21 each.  18 to 21 is pretty normal for a hd7970




here is  some free advice ask before you spend  lots of free info for you here.

[Entropize]

I'm getting 34Mh/s total so about 17 each, seems low, but as I've seen before windows isn't always (read: never is) the most efficient OS for this type of thing. Whats the leanest setup, should I boot up in linux and run then from there?

[LeChuckDE]

I'm getting 34Mh/s total so about 17 each, seems low, but as I've seen before windows isn't always (read: never is) the most efficient OS for this type of thing. Whats the leanest setup, should I boot up in linux and run then from there?

japp, windows drivers are not so fast then the linux ones... 17 MH/s on Windows is good

[QuintLeo]

Crossfire does ZERO for mining, and in some cases might slow down mining software.

 Windows depends a lot on the win version AND the driver version - it can sometimes top LINUX because the OC/OV tools are better, but it's not usually worth the price of the OS to get the better tools.

[LeChuckDE]

Crossfire does ZERO for mining, and in some cases might slow down mining software.

 Windows depends a lot on the win version AND the driver version - it can sometimes top LINUX because the OC/OV tools are better, but it's not usually worth the price of the OS to get the better tools.

to tools for OC/OV or UC/UV are not better !
The only have a GUI nothing more, nothing less.
Linux tools have the same functions over commandline and much more

[QuintLeo]

I've not seen ANY LINUX tool for AMD cards that allows voltage control at all.

UC is also problematic - ATICONFIG will let you set an underclock, but the card then IGNORES it in all of my experience with it on dozens of different cards.
Ditto CCC for LINUX.

OC on the other hand works just fine.

[LeChuckDE]

I've not seen ANY LINUX tool for AMD cards that allows voltage control at all.

UC is also problematic - ATICONFIG will let you set an underclock, but the card then IGNORES it in all of my experience with it on dozens of different cards.
Ditto CCC for LINUX.

OC on the other hand works just fine.

have you tried AMDOverdriveCTRL, atitweak etc?
before you could set Voltage settings you have to enable this feature elsewell it will ignored due GPU.
don't talk bullshit about OC/UC, OV/UV when you only don't know how to do that ...

[QuintLeo]

I've not seen ANY LINUX tool for AMD cards that allows voltage control at all.

UC is also problematic - ATICONFIG will let you set an underclock, but the card then IGNORES it in all of my experience with it on dozens of different cards.
Ditto CCC for LINUX.

OC on the other hand works just fine.

have you tried AMDOverdriveCTRL, atitweak etc?
before you could set Voltage settings you have to enable this feature elsewell it will ignored due GPU.
don't talk bullshit about OC/UC, OV/UV when you only don't know how to do that ...

 AMDOverdriveCTRL was never updated for the R9 290 or R9 280x, in my reading about it - and it flat out didn't do voltage adjustment on quite a few of the cards it was SUPPOSED to work on (locked BIOS issues was apparently the concensus on those cards).
 I tried to download atitweak from somewhere, but it came up as virus infected, and I never found anywhere else I COULD download it from that seemed like a legit site.

 Academic point on the voltages at this time, since I DID find working copies of TheStilt BIOS series and don't need to worry about LINUX-specific voltage mod tools any more.