Bitcoin Forum

Hello.

I have added VTX HD7950 card to my mining rig, where already was a good miner HD 7970.

Problem is, that i can get 735kh/s from my sapphire HD7970, but HD 7950 gives me only 585kh/s

curent stable Settings for HD 7970: 1.113v / 1047 core / 1840 memory
                                   HD 7950: 1.000v / 1110 core / 1500 memory

PICTURE:
http://postimg.org/image/ktkgnt9kp/

In the picture you can see screen with my cgminer settings and miner screen too, when i tryed higher thread concurency cgminer did not start, just hanging on the first title where is writed cgminer version etc. but a max alloc is set to 100

With BTC mining i get 700 / 669 Mh/s respectively. settings for BTC:

curent stable Settings for HD 7970: 1.175v / 1172 core / 160 memory
                                   HD 7950: 1.144v / 1270 core / 150 memory

Saw that many can get 650kh/s and more, would like to run my miner more efficiency, please help. Thanks.

Also maybe someone can suggest program that could restart PC remotely, teamviewer is showing PC is online, but cant connect to him and it is not mining now, and it is not possible to restart it using teamviewer :(

Hey,  on your BTC settings, how did you get the mem clock down to 160,, lowest i can go is 175?

 HD 7970: 1.175v / 1172 core / 160 memory
 HD 7950: 1.144v / 1270 core / 150 memory

How can you select how many core to use? Thanks.

Its called MSI afterburner, there was a guide how to set it up, its the esiest part. Also for scrypt i dont need those low mem MHz

Yes I use the latest MSI afternburner too and use the profile clear trick to get the mem speed down..  but mine only goes as low as 175

I mine LTC atm and both my Gigabyte 7970 Ghz Edition cards do ~730Kh/s. On stock 1100/1500 clocks they only manage ~560Kh/s but if I drop the core clock down a notch they ramp up and mine away happily. Sadly they are voltage locked so there is not much at all I can do about that :(

Link to screenshot (http://www.twikswtf.com/pics/ss.png)

CGMiner settings in my batch file are:

Yea, i know, with 7970's its an easy story to set it up, but i got 7950 mixed in the same rig and it dont want to use thread concurency biiger that 11000, although i set GPU_MAX_ALLOC_PERCENT 100

You're deleting the .bin files between settings changes? I read it's a good idea to do so when adjusting cmd line parameters for cgminer.

Edit: I found when using a high thread concurrency, cgminer would either shit pants or my 7970's would hash stupidly low. Like 100-300Kh/s each, despite cgminer detecting 22400 for TC.

yea, i am deleting them, without that it was a mess :)
Now i can set the thread concurency to high levels, but it still either hashes lower, or hashes very low, how to get this card to mine faster?

I guess it's a trial and error thing really, try with just the 7950 and tweak it till you get it hashing right. Try with just 8192 thread concurrency. Lower clocks seem to yield better results than higher ones. Although this is going by experience with my 7970's... BTC mining is obv different.

Start cgminer with just the -I 13 (add --thread-concurrency 8192 if you want lower TC to begin with) and play with the core clock. There will be a sweet spot either with the core or memory clocks. Originally the clocks I'm using now, my cards didn't like at all... dunno what happened but after a few reboots the same clocks I'm using seemed to work a treat. Any more and hashing would slow to a crawl. Unfortunately each card is different but you'll find a decent hash rate eventually.. Really that's all I can offer in advice, which seems a little bland and kind of an empty response but given that I don't own a 7950, I can't really say what will work well with your card. There are a fair few threads on those cards tho, I found myself trawling through a tonne for my 7970's... alot of the settings suggested didn't work for me but a combination of a few helped me get on the right track.

ok will try different concurencies and clocks more. Right now 1110 1500 seems to optimal, changing one or another gets hashrate only lower.