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Title: dual 6870 on 12.04 LTS - any gotchas or advice? (and 2 easy questions) Post by: bitcoinnix on March 18, 2013, 12:57:09 PM 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! Title: Re: dual 6870 on 12.04 LTS - any gotchas or advice? (and 2 easy questions) Post by: kpriess on March 18, 2013, 02:27:28 PM 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.. Title: Re: dual 6870 on 12.04 LTS - any gotchas or advice? (and 2 easy questions) Post by: bitcoinnix on March 18, 2013, 03:25:11 PM 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.. Title: Re: dual 6870 on 12.04 LTS - any gotchas or advice? (and 2 easy questions) Post by: kpriess on March 18, 2013, 04:50:12 PM 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.. They're easy to make, just 3 resistors on a DVI2VGA adapter and you're set.. Plenty of DIYs out there.. |