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Author Topic: dual 6870 on 12.04 LTS - any gotchas or advice? (and 2 easy questions)  (Read 706 times)
bitcoinnix
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March 18, 2013, 12:57:09 PM
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Right now I'm running a single 6870 at stock speeds (900/1050) @ intensity 17 and getting about 290 kH/s sustained at 69C in Xubuntu 12.04 LTS with the 2.4SDK and 2.6 driver.

I've got a 2nd 6870 waiting to go in - have to wait on a bigger PSU.  2 questions about this upcoming upgrade:
1.  Are the gains of a 2nd adapter usually 2x or some smaller percentage, like +75% so far as hash rate goes? 
2.  Do I need the crossfire adapter or do I run these independently?  I've never had more than one GPU before...

Anyone got any advice for optimizations or gotchas I should be aware of for this configuration?

Thanks!

BEWARE:  NOTROLL.IN POOL MAY STEAL YOUR GENERATED LTC
Original thread starts here:  https://bitcointalk.org/index.php?topic=92716.msg1782471#msg1782471
Theft discussion thread is here:  https://bitcointalk.org/index.php?topic=172667.0
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kpriess
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March 18, 2013, 02:27:28 PM
 #2

Right now I'm running a single 6870 at stock speeds (900/1050) @ intensity 17 and getting about 290 kH/s sustained at 69C in Xubuntu 12.04 LTS with the 2.4SDK and 2.6 driver.

I've got a 2nd 6870 waiting to go in - have to wait on a bigger PSU.  2 questions about this upcoming upgrade:
1.  Are the gains of a 2nd adapter usually 2x or some smaller percentage, like +75% so far as hash rate goes? 
2.  Do I need the crossfire adapter or do I run these independently?  I've never had more than one GPU before...

Anyone got any advice for optimizations or gotchas I should be aware of for this configuration?

Thanks!

You could probably hash at ~275-325 with the right flags..

You can run all the cards your system can take without penalty as long as you DO NOT cross/triple/etc-fire them, run them independently with VGA plugs, that's how I had my 4 6870s mining back in the time I had them..
bitcoinnix
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March 18, 2013, 03:25:11 PM
 #3

Right now I'm running a single 6870 at stock speeds (900/1050) @ intensity 17 and getting about 290 kH/s sustained at 69C in Xubuntu 12.04 LTS with the 2.4SDK and 2.6 driver.

I've got a 2nd 6870 waiting to go in - have to wait on a bigger PSU.  2 questions about this upcoming upgrade:
1.  Are the gains of a 2nd adapter usually 2x or some smaller percentage, like +75% so far as hash rate goes? 
2.  Do I need the crossfire adapter or do I run these independently?  I've never had more than one GPU before...

Anyone got any advice for optimizations or gotchas I should be aware of for this configuration?

Thanks!

You could probably hash at ~275-325 with the right flags..

You can run all the cards your system can take without penalty as long as you DO NOT cross/triple/etc-fire them, run them independently with VGA plugs, that's how I had my 4 6870s mining back in the time I had them..
Thanks man - never heard of the VGA plug thing before! 

BEWARE:  NOTROLL.IN POOL MAY STEAL YOUR GENERATED LTC
Original thread starts here:  https://bitcointalk.org/index.php?topic=92716.msg1782471#msg1782471
Theft discussion thread is here:  https://bitcointalk.org/index.php?topic=172667.0
kpriess
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March 18, 2013, 04:50:12 PM
 #4

Right now I'm running a single 6870 at stock speeds (900/1050) @ intensity 17 and getting about 290 kH/s sustained at 69C in Xubuntu 12.04 LTS with the 2.4SDK and 2.6 driver.

I've got a 2nd 6870 waiting to go in - have to wait on a bigger PSU.  2 questions about this upcoming upgrade:
1.  Are the gains of a 2nd adapter usually 2x or some smaller percentage, like +75% so far as hash rate goes? 
2.  Do I need the crossfire adapter or do I run these independently?  I've never had more than one GPU before...

Anyone got any advice for optimizations or gotchas I should be aware of for this configuration?

Thanks!

You could probably hash at ~275-325 with the right flags..

You can run all the cards your system can take without penalty as long as you DO NOT cross/triple/etc-fire them, run them independently with VGA plugs, that's how I had my 4 6870s mining back in the time I had them..
Thanks man - never heard of the VGA plug thing before! 


They're easy to make, just 3 resistors on a DVI2VGA adapter and you're set.. Plenty of DIYs out there..
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