SLI working

[katdogfizzow]

Ok, I've got it going too with 2 460 GTXs, thanks to this post 335th_GRAthos. I can see an improvement in FPS. However, I think Im getting some micro-stutter at times??? (could be Im crazy)....I'll have to do some more testing/tweaking when I get some more time.

Heres what I did so far in order:

(1) updated to 280.19 nvidia driver
(2) I swapped out the nv_disp.inf file with the one linked
(3) Used Invidia Inspector to change
(a) SLI compatibility bits (DX10): 0x000000F5
(b) NVIDIA predefined SLI mode on DirectX 10: SLI_PREREFINED_MODE_DX10_FORCE_AFR

I hope changing the nv_disp.inf was correct. Wasn't sure if that was necessary with this beta driver also. Please let me know if you see anything wrong or if I can tweak something. I'll repost if I have any better results

Thanks again for getting this working for me

[HeavyHemi]

Originally Posted by katdogfizzow

Ok, I've got it going too with 2 460 GTXs, thanks to this post 335th_GRAthos. I can see an improvement in FPS. However, I think Im getting some micro-stutter at times??? (could be Im crazy)....I'll have to do some more testing/tweaking when I get some more time.

Heres what I did so far in order:

(1) updated to 280.19 nvidia driver
(2) I swapped out the nv_disp.inf file with the one linked
(3) Used Invidia Inspector to change
(a) SLI compatibility bits (DX10): 0x000000F5
(b) NVIDIA predefined SLI mode on DirectX 10: SLI_PREREFINED_MODE_DX10_FORCE_AFR

I hope changing the nv_disp.inf was correct. Wasn't sure if that was necessary with this beta driver also. Please let me know if you see anything wrong or if I can tweak something. I'll repost if I have any better results

Thanks again for getting this working for me

Once you've installed the driver, changing the nv_disp.inf file doesn't do anything. It's only referenced during the driver install. As the 280.19 driver is a unified GeForce driver, your card is supported. However, nv_dips.inf files are specific to driver version. So if you try to reinstall the driver from the C:\nvidia folder by running the setup.exe it will likely fail because the driver version in the nv_disp.inf file header is wrong. You can read the .inf files with notepad.

[katdogfizzow]

Originally Posted by HeavyHemi

Once you've installed the driver, changing the nv_disp.inf file doesn't do anything. It's only referenced during the driver install. As the 280.19 driver is a unified GeForce driver, your card is supported. However, nv_dips.inf files are specific to driver version. So if you try to reinstall the driver from the C:\nvidia folder by running the setup.exe it will likely fail because the driver version in the nv_disp.inf file header is wrong. You can read the .inf files with notepad.

Thanks for explanation....I have another question.

Does this fix "force AFR" work if SLI is disabled in the NVIDIA control panel? I just noticed my box was checked for Disable SLI. When I changed it to "Maximize 3D Performance", the game breaks with flickering and all sorts of craziness with 15fps. I must have done something wrong?

I have to keep disabled SLI in this setting. Is this correct? or do I in fact not have SLI going? Looks like I dont...hmm

[335th_GRAthos]

Originally Posted by katdogfizzow

Does this fix "force AFR" work if SLI is disabled in the NVIDIA control panel? I noticed my box was checked for Disable SLI.

Hmmm...
As far as I know, Disable SLI at the control panel means that you do NOT have SLI.

It is also easy to cross check whether your two cards are working. Look at my screenshots at the far right you can see I have the monitors for each of the GPU cards and they show different temperature and MHz frequency for each card with SLI working and not.


~S~

[katdogfizzow]

Originally Posted by 335th_GRAthos

Hmmm...
As far as I know, Disable SLI at the control panel means that you do NOT have SLI.

It is also easy to cross check whether your two cards are working. Look at my screenshots at the far right you can see I have the monitors for each of the GPU cards and they show different temperature and MHz frequency for each card with SLI working and not.


~S~

Yes, I monitored it with afterburner and was showing only one card. I'm not sure how that was disabled, but it was. The good news is I was getting playable framerates with one card, but I don't have SLI working=

Very dramatic glitches and fps loss with SLI enabled...back to the drawing board I guess. Thanks for the help. Let me know if you have any ideas.


This config did not work for me with or without the epilepsy filter.

[katdogfizzow]

Ok, so I finally have SLI working and it had to with the Epilepsy Filter being unchecked. I read somewhere that this was the reason for SLI not working, so I checked it. Also, compatibility bits and AFR seemed to cause problems with my configuration.

So apparently, all it was as simple as checking/enabling the Epilepsy Filter. Still testing

00, 31-07-2011 16:46:44, Hardware monitoring log v1.4 
01, 31-07-2011 16:46:44, GeForce GTX 460,GeForce GTX 460
02, 31-07-2011 16:46:44, GPU1 temperature    ,GPU2 temperature    ,GPU1 usage          ,GPU2 usage          ,GPU1 fan speed      ,GPU2 fan speed      ,GPU1 fan tachometer ,GPU2 fan tachometer ,GPU1 core clock     ,GPU2 core clock     ,GPU1 shader clock   ,GPU2 shader clock   ,GPU1 memory clock   ,GPU1 memory usage   ,GPU2 memory clock   ,GPU2 memory usage   
                             
80, 31-07-2011 16:46:51, 51.000              ,33.000              ,98.000              ,8.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,1002.117            ,135.000             ,1002.117            
80, 31-07-2011 16:46:52, 53.000              ,33.000              ,99.000              ,6.000               ,40.000              ,40.000              ,1530.000            ,1590.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.367             ,135.000             ,998.367             
80, 31-07-2011 16:46:53, 54.000              ,33.000              ,99.000              ,7.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.367             ,135.000             ,998.367             
80, 31-07-2011 16:46:54, 54.000              ,33.000              ,99.000              ,7.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.367             ,135.000             ,998.367             
80, 31-07-2011 16:46:55, 55.000              ,33.000              ,99.000              ,7.000               ,40.000              ,40.000              ,1500.000            ,1590.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.539             ,135.000             ,998.539             
80, 31-07-2011 16:46:56, 56.000              ,33.000              ,99.000              ,9.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.508             ,135.000             ,998.508             
80, 31-07-2011 16:46:57, 56.000              ,33.000              ,99.000              ,9.000               ,40.000              ,40.000              ,1500.000            ,1590.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.547             ,135.000             ,998.547             
80, 31-07-2011 16:46:58, 56.000              ,33.000              ,99.000              ,9.000               ,40.000              ,40.000              ,1530.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.547             ,135.000             ,998.547             
80, 31-07-2011 16:46:59, 56.000              ,33.000              ,99.000              ,9.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.547             ,135.000             ,998.547             
80, 31-07-2011 16:47:00, 57.000              ,33.000              ,99.000              ,6.000               ,40.000              ,40.000              ,1500.000            ,1590.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,998.547             ,135.000             ,998.547             
80, 31-07-2011 16:47:01, 57.000              ,33.000              ,99.000              ,9.000               ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,995.406             ,135.000             ,995.406             
80, 31-07-2011 16:47:02, 57.000              ,33.000              ,99.000              ,10.000              ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,995.461             ,135.000             ,995.461             
80, 31-07-2011 16:47:03, 57.000              ,33.000              ,98.000              ,14.000              ,40.000              ,40.000              ,1500.000            ,1590.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,995.406             ,135.000             ,995.406             
80, 31-07-2011 16:47:04, 57.000              ,33.000              ,99.000              ,11.000              ,40.000              ,40.000              ,1500.000            ,1560.000            ,715.000             ,50.500              ,1430.000            ,101.000             ,1800.000            ,995.461             ,135.000             ,995.461

[335th_GRAthos]

Originally Posted by katdogfizzow

Ok, so I finally have SLI working and it had to with the Epilepsy Filter being unchecked. I read somewhere that this was the reason for SLI not working, so I checked it. Also, compatibility bits and AFR seemed to cause problems with my configuration.

So apparently, all it was as simple as checking/enabling the Epilepsy Filter. Still testing

Nice to hear that, good to know that you are someone who bites his teeth and does not let go...

Just to make sure I understood correctly, you got SLI working (after you found the error). Because from the code you posted above, looking at the differences between GPU1 and GPU2 in temp, shaders clock, it is obvious that only one GPU is active.


~S~