litecoin 5870 & 7850 cgminer settings

[thebitmine010]

hi,

as the title suggests i have some problems with 2 of my cards.

XFX 5870 1GB
On the 5870 intensity 9 - 13 works but gets 260 k max if i go higher i almost only get HW errors hashrate goes up to max 310.
But if i change the thread concurrency to anything above 5000 i get no errors but my hashrate drops to around 280 kh no matter what settings i try it just stays at 280
any suggestions?

MSI R7850-1GD5/OC
The 7850 is a different story i can get 280 kh:

Code:

./cgminer --scrypt --thread-concurrency 5120 -I 12 --gpu-engine 900 --gpu-memclock 1200 -w 256 

But it hangs between 1 and 2 hours with other settings i can get higher hashrates but it hangs within 20 min. (hangs as in cgminer needs restart but sometimes it cant find card after restart)
Is the card fried?

I tested both cards on seperatly on a asus P8H77-V LE with 8Gb memory and 450w power running Xubuntu.

thanks!

[1715077896]

1715077896

[1715077896]

1715077896

[Nekon]

For the 7850 that I've tested, more than 300 are achievable... try to test differente combinations of threadconcurrency and raise a little intensity.
And for the computer freeze... not sure its realted at all with bad settings even if now they are a bit low.. maybe its a different problem of power or temperature of the card or computer.

[thebitmine010]

sorry cgminer hangs and sometimes i need to reboot the computer because if i restart cgminer it cant find the card.

[thebitmine010]

thanks, how high do you run the tc.
i'll try some more with the tc and intensity but cgminer crashes most of the times.
temp of the card stays at 60c and i also tried a 7950 in the exact same rig and it works perfect.

[tumblerer]

Using windows, a high intensity can cause windows to think my drivers have crashed.  As I understand its a more recent Catalyst thing (feature?).

Downgrading drivers, or using Linux might fix it for you.

[thebitmine010]

forgot to say running Xubuntu first tried headless trough ssh now just attached a screen and keyboard.

[darkry]

I have 2 5850, I achieve 320-330 KH/s each with the following settings:

--intensity 16
--gpu-threads 1
--shaders 1440 <- tune this according to your gpu shaders
-g 2
--thread-concurrency 5600

Last Catalyst beta (13.5 if i remember well), win7 32bit.
The two cards stay at 85/75 degrees... a bit high, but I want to squeeze them as much as possible, since I bought them used for just 70euros  

Tuned with this nice guide: http://zx896.ru/publ/bitcoin/faq_cgminer_for_litecoin/12-1-0-43

[thebitmine010]

thanks, tried with the shaders but no real difference if i remember correct according to the cgminer scrypt README if you set the the thread-concurrency the shaders are irrelevant.

your settings confuse me a bit.. --gpu-threads 1 is the same as -g 1 but you have -g 2 so how many threads does it run at?

i'll give the beta drivers a try!
i bought the 5870 for 100 euro new

[darkry]

thanks, tried with the shaders but no real difference if i remember correct according to the cgminer scrypt README if you set the the thread-concurrency the shaders are irrelevant.

your settings confuse me a bit.. --gpu-threads 1 is the same as -g 1 but you have -g 2 so how many threads does it run at?

i'll give the beta drivers a try!
i bought the 5870 for 100 euro new

yeah sorry I did a mistake, I'm currently running with -g 2, however that doesn't seem to affect significantly performances.