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Message 1108082 - Posted: 20 May 2011, 23:57:26 UTC

I had posted before about one of my systems that just did not seem to perform as it should, first with 2 gtx295s and now with 2 gtx580s. I could see that all both cards were working under tasks. I tried reinstaling srti, nvidia drivers, and even windows, all with no improvements. I had asked here if anyone knew if having multiple moniors would have an effect. I tried putting both on 1 card and also each on a seperate card. With the 580s i noticed that it was taking 42-43 minutes for each task with each card doing 2 workunits apiece. Most of my other setups can do them in about 15 minutes. Finally I did disconnet the second monitor, and guess what, the times are now where they should be. I really like having the 2 monitors, but 18000 RAC with 2 580s was not productive. Now I will have to wait untill the wife gets home to see how she reacts, as this is the main computer she uses. Hopefully we can get by with just the one:-)
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Message 1108088 - Posted: 21 May 2011, 0:21:38 UTC - in response to Message 1108082.

I had posted before about one of my systems that just did not seem to perform as it should, first with 2 gtx295s and now with 2 gtx580s. I could see that all both cards were working under tasks. I tried reinstaling srti, nvidia drivers, and even windows, all with no improvements. I had asked here if anyone knew if having multiple moniors would have an effect. I tried putting both on 1 card and also each on a seperate card. With the 580s i noticed that it was taking 42-43 minutes for each task with each card doing 2 workunits apiece. Most of my other setups can do them in about 15 minutes. Finally I did disconnet the second monitor, and guess what, the times are now where they should be. I really like having the 2 monitors, but 18000 RAC with 2 580s was not productive. Now I will have to wait untill the wife gets home to see how she reacts, as this is the main computer she uses. Hopefully we can get by with just the one:-)


I've got dual monitors and don't have that issue at all. Are you setup as SLi? And what drivers are you running?
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Message 1108106 - Posted: 21 May 2011, 1:42:50 UTC

I am using 266.58, and was using the newer 270 drivers, but switched back trying to solve the problem. The Nvidia control panel does not show the sli option on several of my systems, just allows multiple monitors and 3D settings. I do not have a SLI connector on the cards. This is the same as I have on several systems which all work.
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Message 1108245 - Posted: 21 May 2011, 11:42:40 UTC - in response to Message 1108106.

What about MB BIOS settings for SLI? Might that be causing your problem?
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Message 1108488 - Posted: 21 May 2011, 23:33:39 UTC - in response to Message 1108245.

Don't know which CPU U use, but an i7-2600, has an onchip GPU, which would/should be better then previous solutions like handeling graphics by chipset and CPU, isn't that fast, but I have 2 HD5870, with a crossfire connection, but BOINC
sees them as 2 separate GPUs. And they're blazingly fast, tried Crysis 2, don't see
the 'fun' of shootin' around, in order to reach your 'goal' ;-)
If you want to connect more screens, depends on the cards output-bus, DVI, most cases also VGA, HDMI(includes sound).



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Message 1108508 - Posted: 22 May 2011, 0:34:11 UTC

I did not realize that there are settings for SLI in the bios, so I never thought of looking there, but it is strange that it works with the additional monitor disconnected. It seems that every multi GPU system I have underperforms. Several worked well in the begining, then the performance degraded , and I just cant seem to figure them out.The units with single GPUs perform very well.
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Message 1109254 - Posted: 24 May 2011, 3:24:01 UTC - in response to Message 1108106.

I do not have a SLI connector on the cards. This is the same as I have on several systems which all work.


I had this back on 2x 8800GTX's and once I put the SLi Connector on (Thank you eBay as I lost mine) everything picked up and runs alot better. I also have the SLi option in the NVIDIA control panel.

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Message 1109257 - Posted: 24 May 2011, 3:38:36 UTC - in response to Message 1109254.

I do not have a SLI connector on the cards. This is the same as I have on several systems which all work.


I had this back on 2x 8800GTX's and once I put the SLi Connector on (Thank you eBay as I lost mine) everything picked up and runs alot better. I also have the SLi option in the NVIDIA control panel.


Yeah I don't believe you will get the SLi options in the control panel without the connector.
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Message 1109388 - Posted: 24 May 2011, 15:48:23 UTC

It now appears that the problem has not been resolved. The time per WU have gone back to what they were before at about 42-45 minutes. The system does not perform better with 2 580s or 2 295s than it did with 2 8800s. The RAC is about the same.
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Message 1109438 - Posted: 24 May 2011, 22:59:31 UTC

I know when I ran my 2 GTX 480's in SLI Seti times were far worse. If you disable SLI then they run at max speed again. I was just disabling SLI in the Nvidia driver when I was running Seti and enabling it when I wanted to play games.
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Message 1109440 - Posted: 24 May 2011, 23:02:39 UTC - in response to Message 1109438.

I know when I ran my 2 GTX 480's in SLI Seti times were far worse. If you disable SLI then they run at max speed again. I was just disabling SLI in the Nvidia driver when I was running Seti and enabling it when I wanted to play games.

If you use an up-to-date driver, I believe you can leave SLI enabled and have the best of both worlds.

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Message 1109460 - Posted: 25 May 2011, 0:54:52 UTC - in response to Message 1109440.

I know when I ran my 2 GTX 480's in SLI Seti times were far worse. If you disable SLI then they run at max speed again. I was just disabling SLI in the Nvidia driver when I was running Seti and enabling it when I wanted to play games.

If you use an up-to-date driver, I believe you can leave SLI enabled and have the best of both worlds.


I was using 266.58 and had the issue. Once I get the replacement, replacement power supply for the dual GTX 480 system back I will test the new one.
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Message 1109467 - Posted: 25 May 2011, 1:22:46 UTC

I dont have the SLI connector installed and I have tried 266.58, and the newer drivers, all with the same results.
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Message 1109471 - Posted: 25 May 2011, 1:35:44 UTC - in response to Message 1109467.

I dont have the SLI connector installed and I have tried 266.58, and the newer drivers, all with the same results.


Have you tried a program that will tell you what speeds the core and memory are running at? Maybe the cards are getting down clocked and that is what is causing the long completion times. The second monitor shouldn't do a thing to the times of Seti.
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Message 1109554 - Posted: 25 May 2011, 6:29:08 UTC

I use MSI Afterburner. I have only heard of problems with the newest drivers down clocking over clocked cards and that did happen on my systems as well. The clock and cores are running at standard speeds for these cards as I do not have them over clocked at this time.
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