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Author Topic: 7970 GPU crash = extra 10mh/s?  (Read 1530 times)
hotdealdave
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February 08, 2013, 03:13:11 AM
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I just discovered something after installing the 13.2 beta5 drivers. I was checking if I could watch youtube videos while hashing, on my overclocked card. Apparently I can't, because it crashed my video driver. However since I restarted bfgminer after the crash, I have been consistently running 5-10mh/s faster.

I'm running at 1125/1125 with stock volts. Before I was averaging just under 670mh/s. Now I'm averaging just under 680mh/s. Edit: Also, the temps are 5 degrees C lower!

I'll have to run it for a while before I can be sure that it's really hashing faster, and not just displaying a higher value, but I wonder if anyone else has had something similar happen.

Edit: a couple of things I should mention:

1.) I had been, for a couple of months using 12.10 drivers. During that time, I found 1125 to be about the fastest I can run stable. It gets about 670mh/s consistently at that speed.
2.) I upgraded to 13.2 beta5 earlier today and observed little or no increase in mh/s. Still around 670mh/s.
3.) Since the crash, when I try to play a Youtube video I just get a green square, even after restarting firefox. This makes me think it's some driver subsystem that crashed and didn't restart, freeing up more resources for mining.
4.) Curiously, GPU-Z shows the GPU workload at 0-2%. It is definitely hashing however, as I've kept an eye on my pool's stats for the last 15min and seen the hashrate for that worker stay steady.
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superfastkyle
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February 08, 2013, 08:26:23 AM
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What miner software are you using? Its possible its an error and isn't calculating correctly. Guiminer I know has bugs that report wrong m/hash. Also its possible Aero stopped when the driver crashed and is giving you a couple extra hashes. But honestly its been months since 10 or even 20 extra megahashes has made a perceivable difference in profit. Just find what seems stable, and set your clocks 10mhz lower than that
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February 08, 2013, 03:33:18 PM
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I use BFGminer and mine on Eclipse. It's true that it might be something with the mining software's calculation. I've been keeping an eye on how many mh/s Eclipse sees from that worker, but it goes up and down as it does for my other workers, so it's hard to tell if the increase is showing up there or not.
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February 08, 2013, 07:56:30 PM
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Does your U: rate go up any? Maybe run for 48 hours on each and see if there's a difference.
Edit: A U: rate won't really show a difinitive difference with only 10mh/s , so this was a bad idea. Tongue N/M.

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February 08, 2013, 08:15:09 PM
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  A small sugestion. Try 1125/leave memory at default. I figured at 7950/7950, at my cards, its usually the memory that makes issues when its lowered, not the gpu increased - chrome used to crush on me same way.


I just discovered something after installing the 13.2 beta5 drivers. I was checking if I could watch youtube videos while hashing, on my overclocked card. Apparently I can't, because it crashed my video driver. However since I restarted bfgminer after the crash, I have been consistently running 5-10mh/s faster.

I'm running at 1125/1125 with stock volts. Before I was averaging just under 670mh/s. Now I'm averaging just under 680mh/s. Edit: Also, the temps are 5 degrees C lower!

I'll have to run it for a while before I can be sure that it's really hashing faster, and not just displaying a higher value, but I wonder if anyone else has had something similar happen.

Edit: a couple of things I should mention:

1.) I had been, for a couple of months using 12.10 drivers. During that time, I found 1125 to be about the fastest I can run stable. It gets about 670mh/s consistently at that speed.
2.) I upgraded to 13.2 beta5 earlier today and observed little or no increase in mh/s. Still around 670mh/s.
3.) Since the crash, when I try to play a Youtube video I just get a green square, even after restarting firefox. This makes me think it's some driver subsystem that crashed and didn't restart, freeing up more resources for mining.
4.) Curiously, GPU-Z shows the GPU workload at 0-2%. It is definitely hashing however, as I've kept an eye on my pool's stats for the last 15min and seen the hashrate for that worker stay steady.

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hotdealdave
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February 08, 2013, 11:44:26 PM
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No it's not definitive, but I do think it's real. The "spikes" in my hashing speed on eclipsemc seem a little higher. The "valleys" seem unchanged, but I've been seeing some disconnections from the server occasionally so it's hard to tell.

vdragon, thanks but my miner crashes from the heat when the memory speed is at default. My setup is not ideal, cooling-wise. I just have to run the GPU slower to have a totally stable system.
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February 13, 2013, 05:29:51 AM
 #7

Updating the drivers will sometimes reset/ enable the flash player's hardware acceleration feature.

If it still shows as being disabled, try uninstalling then reinstalling flash.

gl Smiley

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