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Author Topic: 6990 best settings? is okay together with 1x5870?  (Read 1747 times)
ptshamrock
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July 21, 2011, 04:42:44 PM
 #1

hi!



can somebody please tell me the best overclock settings for an sapphire 6990 ? i have move the bios switch...okay?


also i have one 5870 in the same system..its dedecated for mining ..will this work?

i am using archlinux and run them headless..

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deslok
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July 21, 2011, 04:53:53 PM
 #2

You can't crossfire them but they can mine together. As far as the best settings I'd water by looking here.
 https://en.bitcoin.it/wiki/Mining_hardware_comparison

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ptshamrock
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July 21, 2011, 04:57:33 PM
 #3

okay..i have not crossfired them..


i set the following in an skript

BIOS switch at "overclocked" position 1;

aticonfig  --odsc=950,300 --adapter=0  which is 5870

aticonfig  --odsc=990,890 --adapter=1  which is 6990
aticonfig  --odsc=990,890 --adapter=2  which is 6990

with listadapters i get 0=5870 1 =6990 and 2 =6990

so is this right? do i have to clock every core and then start mining for each one seperate right?



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July 21, 2011, 05:14:41 PM
 #4

Yes if you see the cores individually initialize them separately

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ptshamrock
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July 21, 2011, 05:30:17 PM
 #5

okay seems i get them to work..

i reinitialised them all


but now  I can start the 5870 and works without error via skript mine0 for adapter0

then i start a second terminal to fire on the first core of the 6990 via mine1 for adapter1  my display goes black..but still active..as my display doesnt turn off ..just black

switching to the 5870 then does not help...any idea?

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deslok
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July 21, 2011, 05:32:37 PM
 #6

Have you tried them without any overclocks first?
*edit*
Or just starting the 6990 first?

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ptshamrock
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July 21, 2011, 06:04:12 PM
 #7

i did this

http://forum.bitcoin.org/index.php?topic=7374.msg307192#msg307192


then it worked onthe first core for a few seks then hanged..no blackscreen anymore..just hangs it up after showing 0 mhash for a few seks

the 5870 works without problems..

i am right the OC switch in pos1 is switched right?
i assume pos 0 is standard right?

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July 21, 2011, 06:12:01 PM
 #8

switch is now stadard pos..i removed xorg and reinitilised..now they work..not OC'ed but i will check that tomorrow ! thx anyway

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July 21, 2011, 06:19:11 PM
 #9

Sounds like you just need to find some less aggressive overclocks then remember every card is different the mining hardware comparison its a good start but any card could run above our below anything listed there.

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July 21, 2011, 07:43:16 PM
 #10

990mhz is an absolutely insane overclock. Don't start with stuff like that, not to mention the fact most 6990's can't take those frequencies (even if they can you'll have to up the voltage leading in too much power consumption compared to the extra hashrate)

I find 920MHz a stable frequency which yields about 410mhash/s per core for a total of 820mhash/s per card.

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July 21, 2011, 07:48:16 PM
 #11

990mhz is an absolutely insane overclock. Don't start with stuff like that, not to mention the fact most 6990's can't take those frequencies (even if they can you'll have to up the voltage leading in too much power consumption compared to the extra hashrate)

I find 920MHz a stable frequency which yields about 410mhash/s per core for a total of 820mhash/s per card.
920 is my sweet spot too, but I cant get my memory down below 1250, I've tried the 11.6 drivers but there's a bug which prevents the current memory clock actually changing with aticonfig. AmdOverdriveCTRL does exactly the same.
Do you have any tips?

I might just flash the bios with RBE if there's no other solution.

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July 21, 2011, 08:40:42 PM
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990mhz is an absolutely insane overclock. Don't start with stuff like that, not to mention the fact most 6990's can't take those frequencies (even if they can you'll have to up the voltage leading in too much power consumption compared to the extra hashrate)

I find 920MHz a stable frequency which yields about 410mhash/s per core for a total of 820mhash/s per card.
920 is my sweet spot too, but I cant get my memory down below 1250, I've tried the 11.6 drivers but there's a bug which prevents the current memory clock actually changing with aticonfig. AmdOverdriveCTRL does exactly the same.
Do you have any tips?

I might just flash the bios with RBE if there's no other solution.

Try Sapphire Trixx. It works on every single card I have across all my rigs, it can apparently control any sort of memory.

I also succeeded in downclocking to 820mhz on the memory with MSI Afterburner 2.2.0 B5, though it displays at 819.

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ptshamrock
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July 23, 2011, 02:04:39 PM
 #13

990mhz is an absolutely insane overclock. Don't start with stuff like that, not to mention the fact most 6990's can't take those frequencies (even if they can you'll have to up the voltage leading in too much power consumption compared to the extra hashrate)

I find 920MHz a stable frequency which yields about 410mhash/s per core for a total of 820mhash/s per card.
920 is my sweet spot too, but I cant get my memory down below 1250, I've tried the 11.6 drivers but there's a bug which prevents the current memory clock actually changing with aticonfig. AmdOverdriveCTRL does exactly the same.
Do you have any tips?

I might just flash the bios with RBE if there's no other solution.


okay i tried but the cards hang em up!

did u move the OC switch???

920/820 is my setting right now..

however without OCing them they work..but first core at around 290mh and second at 350mh

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July 23, 2011, 02:29:54 PM
 #14

okay tried it with 925,850  works stable OC switch at standard position but i only get 280mh/s on bioth cores?? what am i doing wrong Sad the 5870 runs at 404mh/s stable with 950/300

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ptshamrock
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July 23, 2011, 02:59:04 PM
 #15

without OC and OC switch @ bios2 i get to 336mh/s on 6990 BUT core 1 always hangs itself up after a few seks Sad

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ptshamrock
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July 23, 2011, 04:16:21 PM
 #16

this is reaqlly strange..now everything works fine on core 2 even get to around 400mh/s but core1 is always hanging up after 3-10 sekonds..

tried everything..other kernel..other pool.. with commands ..naked.. Sad please help Cheesy

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ptshamrock
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July 23, 2011, 04:24:17 PM
 #17

this is really really strange ...i just started them all @ btcguild and they work flawlessly Huh!?!?  with 376mh/s





all my other 36 5870 are running @ bitlockers and no pronlem??

can somebody please explain that? ^^

EDIT : dunno why but after rewriting the scripts it works now but still @ 321mh/s ?? why is btcguild so muc faster ?? (besides their idle messages) ?

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July 23, 2011, 06:31:35 PM
 #18

Sounds like you have Powertune enabled on one of the cores, hampering it's performance.

Go to overdrive & set the power slider to 20 to disable PT.

Also, test vanilla (or 3% modded) POCLBM with arguments -v -w128, you should be getting minimum 400mhash/s on both cores.

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