Sapphire dual-x 7970 issue 15LTC for solution.

[ReCat]

I haven't received it either, and I'm sure everyone has repeated the resolution to his problem over and over. I suspect this guy was faking a reward, but if he's legit, I'll divide the LTC between all the people who posted LTC addresses above me.

[Beans]

Raising the thread-concurrency 22400 did allow me to increase the intensity to 20. I got the hashrate up to 670 which is not to bad. These cards should reach 700+ though.

"gpu-engine" : "900-1040",
"gpu-fan" : "65-85",
"gpu-memclock" : "1450",
"gpu-vddc" : "1.040",
"gpu-powertune" : "10",
"gpu-threads" : "1",

The manufacturers didn't make all the 7970's the same, I have a couple visiontek cards that are crap for mining. They run stable at 1080 engine, 1900 memory but only get 500-550kh. So just going off other people's settings doesn't seem to work unless they have the same setup.

[ReCat]

Try changing the engine clocks around. For me, 1050 worked better than 1200 or 1000.

[JoeMattie]

No.

7970's cannot obtain stable settings at intensities above 13.

I don't know why, but I haven't heard of one case where anyone was able to attain a stable configuration with an -I 13+

Set -g to 2, -I to 13, and --thread-concurrency to 8192

Anyone who says intensities above 13 are stable for 7970s don't know what they are talking about.

btw, did anyone receive your 15LTC reward yet?

Incorrect.

7970s run rock solid stable at -I 20 as long as the thread-concurrency is above 16384 and gpu-threads = 1.
They're just slightly faster with -I13 / 8192 / gpu-threads:2 [680kH vs 710 or so]

Oh really?

Please, show me a screenshot of this configuration.

No, better yet, post a short video (30secs-1 minute) and prove that your hashrate stays stable at 680kh/s.

And yes, getting hardware errors means your configuration is unstable.

Absolutely sir.  Video is uploading to youtube as we speak

[JoeMattie]

Raising the thread-concurrency 22400 did allow me to increase the intensity to 20. I got the hashrate up to 670 which is not to bad. These cards should reach 700+ though.

"gpu-engine" : "900-1040",
"gpu-fan" : "65-85",
"gpu-memclock" : "1450",
"gpu-vddc" : "1.040",
"gpu-powertune" : "10",
"gpu-threads" : "1",

The manufacturers didn't make all the 7970's the same, I have a couple visiontek cards that are crap for mining. They run stable at 1080 engine, 1900 memory but only get 500-550kh. So just going off other people's settings doesn't seem to work unless they have the same setup.

I have trouble hitting 700+ in linux with this batch of cards (they're crappy XFX DD 7970s that I've reflashed to lower the vdcc).  I'm happy with the hashrate I'm getting from them.  I have around 10x 7950s to each of my 7970s so I'm not really focused on tweaking these to the max.

[Damnsammit]

I think my answer was the most concise.

You do not go on a "preset" for CGminer.  

You perform checks on intensity, thread concurrency, overclocking, undervolting, and EVERYTHING.

Knowing what someone ELSE is using is a good starting place... but you gotta tweak that shit, yo!

[jnada]

Raising the thread-concurrency 22400 did allow me to increase the intensity to 20. I got the hashrate up to 670 which is not to bad. These cards should reach 700+ though.

"gpu-engine" : "900-1040",
"gpu-fan" : "65-85",
"gpu-memclock" : "1450",
"gpu-vddc" : "1.040",
"gpu-powertune" : "10",
"gpu-threads" : "1",

The manufacturers didn't make all the 7970's the same, I have a couple visiontek cards that are crap for mining. They run stable at 1080 engine, 1900 memory but only get 500-550kh. So just going off other people's settings doesn't seem to work unless they have the same setup.

maybe you should first check who/what is playing with you? any network tools capable?

If you are unable to examine that - just find free mining distro available  in "alternate" section and run it from USB

[Beans]

Slarty's idea fixed my main issue. I was hoping someone had a idea that would let me maintain my speed though. I can't seem to get anything descent with 8192. I was getting 750 with 10240 thread concurrency but only while intensity was 20 which was causing bad shares. I don't think I'm going to get over 680 but I haven't had a chance to test everything yet.

[JoeMattie]

As requested

http://www.youtube.com/watch?v=6avzYvhRrI4

[Beans]

Raising the thread-concurrency 22400 did allow me to increase the intensity to 20. I got the hashrate up to 670 which is not to bad. These cards should reach 700+ though.

"gpu-engine" : "900-1040",
"gpu-fan" : "65-85",
"gpu-memclock" : "1450",
"gpu-vddc" : "1.040",
"gpu-powertune" : "10",
"gpu-threads" : "1",

The manufacturers didn't make all the 7970's the same, I have a couple visiontek cards that are crap for mining. They run stable at 1080 engine, 1900 memory but only get 500-550kh. So just going off other people's settings doesn't seem to work unless they have the same setup.

maybe you should first check who/what is playing with you? any network tools capable?

If you are unable to examine that - just find free mining distro available  in "alternate" section and run it from USB

My house is where routers go to die. We have about 20 wireless devices, mostly mining rigs. We always hit our 300gb traffic limit to.

[Beans]

I thought I had it working, I was testing 2x cards in 2 pc's running through configs. When I stuck all 4 cards in the same pc, I get errors. It has 8gb rams, and 1500watt Thermaltake. That's sufficient for 4x 7970's isn't it?

I'm really started to miss btc mining. I have around 19x 5970's just collecting dust now.

[philipkdick]

No.

7970's cannot obtain stable settings at intensities above 13.

I don't know why, but I haven't heard of one case where anyone was able to attain a stable configuration with an -I 13+

Set -g to 2, -I to 13, and --thread-concurrency to 8192

Anyone who says intensities above 13 are stable for 7970s don't know what they are talking about.

btw, did anyone receive your 15LTC reward yet?

I've run a 7970 for hours at i20  not a hw error in sight ,  don't really care if you believe me or not , I spent a lot of time on them .

Most of the devices I have are 7950 , they are generally better value , but the configuration I have both perform similar.

Only issue I have is the normal issues related to heat dissipation.

So disregard information that suggests I 13 only , I've never run a card under i17.

[nfuse]

i have 2 Sapphire dual-X oc 3gb cards (type 11197-03-40G)  avg 1.521 Mh/s for 2 cards and about 764 Kh/s per card running 24/7 with zero hw errors!

here my setup

use cgminer version 2.11.4 (tryed other but this one worked the best for me, if someone has other ideas about this please let me know

overclock settings: (AMD overdrive from catalyst control center)

Gpu clock 1090 mhz
Memory clock 1500 mhz
Fan 100 %

miner settings: (my solo settings)

cgminer --scrypt -o 127.0.0.1:8110 -u username -p password --thread-concurrency 8192 --worksize 256 -g 2 -I 13 --lookup-gap 2 --shaders 2048 -s 1 --expiry 1 --queue 0

[-ck]

The cgminer documentation has extensive information on how to tune a 7970 for scrypt in the SCRYPT-README.  I spent ages writing documentation, please read it. It even states there that a rate of 745kh was reached, and I mined at that constantly for a few weeks before giving up on LTC.

79x0 devices fall into 2 categories: Those that like ultra high thread concurrencies (>20k) and ONE gpu thread, and these work well at intensity 19 or 20, and those that like much lower thread concurrencies (8192) and TWO gpu threads, and ANY intensity over 13 is going to cause hardware errors or fail to start. Generally speaking, all the overclock models (Ghz edition etc.) prefer the 2 threads while the reference models prefer the one thread. 7950 have no such reference model so it's a mystery which belongs to which category.

[rovchris]

i have 2 Sapphire dual-X oc 3gb cards (type 11197-03-40G)  avg 1.521 Mh/s for 2 cards and about 764 Kh/s per card running 24/7 with zero hw errors!

here my setup

use cgminer version 2.11.4 (tryed other but this one worked the best for me, if someone has other ideas about this please let me know

overclock settings: (AMD overdrive from catalyst control center)

Gpu clock 1090 mhz
Memory clock 1500 mhz
Fan 100 %

miner settings: (my solo settings)

cgminer --scrypt -o 127.0.0.1:8110 -u username -p password --thread-concurrency 8192 --worksize 256 -g 2 -I 13 --lookup-gap 2 --shaders 2048 -s 1 --expiry 1 --queue 0

What voltage are you running them at and also what temp are they running at?

Just interested to know because I find they are very inefficient with regards to power consumption as soon as they get over 80 degrees.

I run the voltage 40mv above the clock frequency to get the highest power efficiency, I usually run the GPU clock at 1000 mhz and the memory at 1525mhz

Edit - just tried 1500 and they run faster!

[altsay]

I dont have a 7970 but I would try adjusting the voltage on both core and mem, and see what happens.

Intensity 17-18 is usually the sweet spot for my 7950s, with a 1:1.5 core to mem speed ratio.

If this helps you, PM me I can give you my LTC address :-)

What khash speed you get with 7950?

[Damnsammit]

I'm really started to miss btc mining. I have around 19x 5970's just collecting dust now.

Why?  You know you can use them for Scrypt mining... and 13.3MH/s would be earning you quite a bit of LTC/FTC/CAP!

[nfuse]

i have 2 Sapphire dual-X oc 3gb cards (type 11197-03-40G)  avg 1.521 Mh/s for 2 cards and about 764 Kh/s per card running 24/7 with zero hw errors!

here my setup

use cgminer version 2.11.4 (tryed other but this one worked the best for me, if someone has other ideas about this please let me know

overclock settings: (AMD overdrive from catalyst control center)

Gpu clock 1090 mhz
Memory clock 1500 mhz
Fan 100 %

miner settings: (my solo settings)

cgminer --scrypt -o 127.0.0.1:8110 -u username -p password --thread-concurrency 8192 --worksize 256 -g 2 -I 13 --lookup-gap 2 --shaders 2048 -s 1 --expiry 1 --queue 0

What voltage are you running them at and also what temp are they running at?

Just interested to know because I find they are very inefficient with regards to power consumption as soon as they get over 80 degrees.

I run the voltage 40mv above the clock frequency to get the highest power efficiency, I usually run the GPU clock at 1000 mhz and the memory at 1525mhz

Edit - just tried 1500 and they run faster!

whats the speed you are getting now?

i run at stock voltage try'd many settings but stock works best for me.

[ReCat]

I tried everything in the world. Nothing can make this guy's GPU's mine faster. I give up.