problems with ltc mining 7970 and 290X

[f.baasch75]

Hello,

I'm trying myself with LTC mining, with only little success.
One card is a 7970 with 1100Mhz, the other a 290X with stock settings.
I tried various cgminer settings, but it didn't work.

7970


R9 290X


Any idea where how to solve the problem? I think a 7970 should do 600-700 and a 290X 750-900, or am I wrong?

Thanks!

[xreichardx]

Hashrate aside, both cards have a catastrophic amount of hardware errors -- that's the "HW:" field in cgminer's output.  Your 7970 has 6223 and the 290x has 841.  Ideally you should have zero hardware errors. 

You'll need to find the specific cgminer settings for your card by exact model number that work without hardware errors.

[f.baasch75]

thanks for this info! how can I accomplish this?

[miztaziggy]

Can't help with the 290 card, but personally I have 2 x R9 280's which are basically the same as the 7970.

Try this on the end of your cgminer line:

--gpu-engine 1000 --gpu-memclock 1600 -I 13 -g 2 -w 256 --thread-concurrency 8192


That's what I use for both cards and I get about 690 on each. It is running a slightly under clocked core and slightly overclocked memory.

FYI - speeding up the core speed actually slows down the hash rate. Standard clock speed for my card is 1070 but it drops the hash rate to 590.

[f.baasch75]

interesting, HW errors are gone but hashrate still down at 390. I used the options on the 7970 like yours without pushing the mem frequency so high, runs at 1400 Mhz.

so it seems neccessary to put the core and mem frequencies to the options.

but still low hashrates 

[peterlustig]

https://litecoin.info/Mining_hardware_comparison
Should find good settings here. 

[navidos]

change the intensity  (I) and thread concurrency to 8192
last night my 7970 only wnet over 700K with I 13 and thread concurrency 8192 if i go above this all goes to HW error

[f.baasch75]

this has been done already  

core now running at 850 MHz with 490 KH.. thats what miztaziggy stated.
Any explanation?

[miztaziggy]

this has been done already  

core now running at 850 MHz with 490 KH.. thats what miztaziggy stated.
Any explanation?

Don't worry about overclocking past its limit. You can't damage the card unless you over volt it.

Just try it at 1000 / 1600 see what you get. I think the 7970 will go higher than the R9 280x that I have anyway. The things I have read suggest about 1150 clock and 1900mhz memory for a 7970.

Apparently the best settings will be at a ratio of clock to memory of about 0.6.

If yours doesnt work at 1000/1600, all that will happen is your screen will go blank and either computer will restart, or, it will go back to desktop and you will get an AMD Driver has stopped responding and has been restarted message. If that's the case, try 960 clock and 1550 memory.

Mine works fine at 1000/1600 but if I go to 1020 / 1650 it restarts my PC after a few minutes.

[MineNerd]

Some 7970's are really bad for mining right out of the box. That being said, it can be corrected and you should be able to hit 700kh/s.
Be sure to read the instructions carefully.

see this thread:

https://bitcointalk.org/index.php?topic=200777.0

[albertdros]

my gigabity 270x is doing 700k constant now but its 83c. Is that fine? If i do other stuff i sometimes get slight artifacts (but im normally not doing anything, just leave it on for mining), but it doesnt shit itself off.