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[Official] BitCoin LiteCoin DigitalCoin and all Crypto Currencies Club And General Information Thread - Page 18

post #171 of 22005
The WU is just all over the place for any of the TC values. There's no telling which is best.
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post #172 of 22005
24000 concurrency is the sweet spot for all of my 2GIB+ GPUs. I get a steady, if modest increase in hash rate going from 8000 to 24000, going much above or below this does make things much more noticeable.

I usually let mine run for about two hours then look at the average hash rate.

This is with nothing running but the miner; if you are using the system for something else, especially if you are mining on the GPU you have your displays connected to, it can be very hard to get a good average.

Also, you should not need to install any OCL/APP SDK with any recent drivers.
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post #173 of 22005
Thread Starter 
Quote:
Originally Posted by Blameless View Post

24000 concurrency is the sweet spot for all of my 2GIB+ GPUs. I get a steady, if modest increase in hash rate going from 8000 to 24000, going much above or below this does make things much more noticeable.

I usually let mine run for about two hours then look at the average hash rate.

This is with nothing running but the miner; if you are using the system for something else, especially if you are mining on the GPU you have your displays connected to, it can be very hard to get a good average.

Also, you should not need to install any OCL/APP SDK with any recent drivers.

13.5b doesn't come with an sdk...and when the new ones do, they come with SDK 2.8 which BREAKS cgminer performance. thumb.gif
post #174 of 22005
Quote:
Originally Posted by Blameless View Post

24000 concurrency is the sweet spot for all of my 2GIB+ GPUs. I get a steady, if modest increase in hash rate going from 8000 to 24000, going much above or below this does make things much more noticeable.

I usually let mine run for about two hours then look at the average hash rate.

This is with nothing running but the miner; if you are using the system for something else, especially if you are mining on the GPU you have your displays connected to, it can be very hard to get a good average.

Also, you should not need to install any OCL/APP SDK with any recent drivers.

Everyone keeps saying they see their hash rate go up when increasing TC. The thing with mine though... it stayed at 550 Khps from 8192 all the way up to 24320 testing them for 25 accepted shares.
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post #175 of 22005
Quote:
Originally Posted by Krusher33 View Post

Everyone keeps saying they see their hash rate go up when increasing TC. The thing with mine though... it stayed at 550 Khps from 8192 all the way up to 24320 testing them for 25 accepted shares.
Just use me .conf file I posted yesterday and see what you get.
 
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post #176 of 22005
Quote:
Originally Posted by Blameless View Post

I don't personally have any 7970s, but I have yet to encounter a GPU that won't hash reliably at intensity 18-20 with the right drivers/OCL and stable clocks. My 5750s, 5850s, 6950s, 6970s, 7950s...even my 4870 and 5650M can do this.

There are plenty of reports of 7970s using intensity 20. Indeed, if intensity 13 was the max, many reported hash rates would be impossible.

I think people shy away from exceeding -I 13 on 7970s because ckolivas posted that its probably not worth it: https://bitcointalk.org/index.php?topic=28402.msg1635964#msg1635964. Anyone that has a 7970 should probably read this thread.

If you have a 7950, you may benefit from .68 core/memory vs .57-.6 used on 7970s. My 7950 hashrate increased by 40+KH/s by using .68.

I think people run into a problem when they run diverse GPUs. I know for me, 13.1 is what I run on my fastest rig, but it is not the best driver for all of the cards, just the most stable for all of them in one rig. I cannot exceed -I 13 on my 7870 XT for example.
Quote:
Originally Posted by ivanlabrie View Post

13.5b doesn't come with an sdk...and when the new ones do, they come with SDK 2.8 which BREAKS cgminer performance. thumb.gif

What SDK comes with each driver? After you install the driver do you know if you can remove the SDK that came with it?
Edited by Mr.N00bLaR - 6/10/13 at 8:22pm
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post #177 of 22005
Quote:
Originally Posted by ivanlabrie View Post

13.5b doesn't come with an sdk...and when the new ones do, they come with SDK 2.8 which BREAKS cgminer performance. thumb.gif

AMD has been integrating the OCL drivers into the core package for the last few versions. They don't have the OpenCL folder or .msi because they don't need them. Try it yourself.

You don't need to install anything besides the display driver for cgminer to work fine. It also does not break cgminer performance.

I've found that reaper only likes cat 12.6 and sdk 2.6, but cgminer is perfectly happy with the OCL version built into 13.5b2 and 13.6.
Quote:
Originally Posted by Krusher33 View Post

Everyone keeps saying they see their hash rate go up when increasing TC. The thing with mine though... it stayed at 550 Khps from 8192 all the way up to 24320 testing them for 25 accepted shares.

Isn't your card limited to sub 1600 memory clock? That's likely the reason.

With 24000 thread concurrency, I see performance scale on my 7950s all the way to 1700+ with a core clock of only 1053MHz. A 7970 at 1.1GHz would need ~2GHz memory before it stopped scaling. Thread concurrency directly controls how much VRAM is used, and if your miner is set to use more than you have bandwith to feed, that could explain why you aren't seeing corresponding increases in hash rate.

It could also be the intensity you are mining at, or some driver issue.
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post #178 of 22005
Here is a screen shot I just took on my primary signature system: http://i.imgur.com/DH9YxzK.png

As you can see, there is no AMD APP directory (I have no SDK installed), and the extracted 13.6 beta driver has the OCL files integrated.

I am also mining scrypt/ltc with cgminer, bouncing between 640 and 650 khash with my 7950 at 1080/1600 (OCL device 1 corresponds to GPU 1, not 2, in MSI AB, which has my monitors plugged into it and is registering a lower hash rate because I dropped intensity from 20 to 13 so I could use the system to take the screen shot and post this), with the config file I've previously posted.
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post #179 of 22005
Quote:
Originally Posted by UNOE View Post

Quote:
Originally Posted by Krusher33 View Post

Everyone keeps saying they see their hash rate go up when increasing TC. The thing with mine though... it stayed at 550 Khps from 8192 all the way up to 24320 testing them for 25 accepted shares.
Just use me .conf file I posted yesterday and see what you get.

Now we're getting somewhere!


Quote:
Originally Posted by Blameless View Post

Quote:
Originally Posted by ivanlabrie View Post

13.5b doesn't come with an sdk...and when the new ones do, they come with SDK 2.8 which BREAKS cgminer performance. thumb.gif

AMD has been integrating the OCL drivers into the core package for the last few versions. They don't have the OpenCL folder or .msi because they don't need them. Try it yourself.

You don't need to install anything besides the display driver for cgminer to work fine. It also does not break cgminer performance.

I've found that reaper only likes cat 12.6 and sdk 2.6, but cgminer is perfectly happy with the OCL version built into 13.5b2 and 13.6.
Quote:
Originally Posted by Krusher33 View Post

Everyone keeps saying they see their hash rate go up when increasing TC. The thing with mine though... it stayed at 550 Khps from 8192 all the way up to 24320 testing them for 25 accepted shares.

Isn't your card limited to sub 1600 memory clock? That's likely the reason.

With 24000 thread concurrency, I see performance scale on my 7950s all the way to 1700+ with a core clock of only 1053MHz. A 7970 at 1.1GHz would need ~2GHz memory before it stopped scaling. Thread concurrency directly controls how much VRAM is used, and if your miner is set to use more than you have bandwith to feed, that could explain why you aren't seeing corresponding increases in hash rate.

It could also be the intensity you are mining at, or some driver issue.

No, 1800. I can bench at 1900 memory clock but it requires voltage increase.

I've tried several drivers so far doing various things Ivan suggested.
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post #180 of 22005
Quote:
Originally Posted by Mr.N00bLaR View Post

I think people shy away from exceeding -I 13 on 7970s because ckolivas posted that its probably not worth it: https://bitcointalk.org/index.php?topic=28402.msg1635964#msg1635964. Anyone that has a 7970 should probably read this thread.

I've read ckolivas' stuff, and while it's a good starting point, I've definitely been able to improve on it.
Quote:
Originally Posted by Mr.N00bLaR View Post

If you have a 7950, you may benefit from .68 core/memory vs .57-.6 used on 7970s. My 7950 hashrate increased by 40+KH/s by using .68.

.68 works, but .65 does get me about 25KH more per card. I do have to overvolt my memory significantly once I start pushing past 1600ish, so I usually sacrifice that little extra boost.
Quote:
Originally Posted by Mr.N00bLaR View Post

I think people run into a problem when they run diverse GPUs. I know for me, 13.1 is what I run on my fastest rig, but it is not the best driver for all of the cards, just the most stable for all of them in one rig. I cannot exceed -I 13 on my 7870 XT for example.

I have a lot of wildly varying AMD GPUs, and as I stated before, I haven't encountered anything that cannot use 18+ with stability.

I even had a system with three different AMD GPUs, from two different generations, in the same box, all running intensity 20 for months at a time.
Quote:
Originally Posted by Mr.N00bLaR View Post

What SDK comes with each driver? After you install the driver do you know if you can remove the SDK that came with it?

If you have an older driver where the SDK is still a separate package, you can run the msi file in the apps\OpenCL (or OpenCL 64) directory and select uninstall.

Newer drivers have OCL built in, and the only way to remove this is to mod it out of the driver before install.
Quote:
Originally Posted by Krusher33 View Post

Now we're getting somewhere!


Looks much closer to where it should be.

I notice your pool is sending you very low difficulty work. Do you have an option to increase this?
Quote:
Originally Posted by Krusher33 View Post

No, 1800. I can bench at 1900 memory clock but it requires voltage increase.

Ah.

What core clock are you running?
Edited by Blameless - 6/10/13 at 8:54pm
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