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~

Thanks for these quick replies and checking out the numbers. Yes, those numbers are from SLI enabled, Epilepsy filter checked and no inspector changes.

I discovered I was SLI disabled in NVIDIA cp (perhaps the new driver 280.19 reset this setting? ) so I made sure to enable SLI. But when I went back into game, I got distant flickering, graphical errors and 15fps with stuttering. YIKES (which I also exp. with with the 275.33) Both instances using the settings that are working for you. I also tried without these settings and nothing worked until I checked the Epilepsy filter.

So,

Before SLI was "enabled" I was getting zeros on the 2nd GPU, but now it seems like something minimal is working there , no? Maybe I need to test more dramatic areas like London with planes, etc...this very small sample was over France where I was getting 40+fps average with mostly Med to High settings and Med trees

Some numbers over London where I think SLI is enabled....I think I see what you mean...I guess both cards should be working closer to full potential? I dont know...For the most part, GPU2 usage stays under 20. I double checked to see if maybe my drivers were messed up/dirty, but "SLI Visual Indicator" works with Arma2 which supports SLI

I see what you mean about the shader clock readings, but I dont know what to make of it:



Perhaps this is the end of the road because the game is not ready for it? Hmmm....or do I try and uncheck the epilepsy Filter and keep tinkering...decisions decisions...

Hi katdogfizzow, sorry for the late reply, I am somewhere at the Greek islands kitesurfing (yes, there is life besides CoD, actually, THANKS TO LUTHIER's fridays' posts ;) ) so internet connection is limited.

Your SLI is not working.
The numbers you need to monitor in order of appearance are:
GPU1 core clock vs GPU2 core clock
GPU1 shader clock vs GPU2 shader clock

You can see that your GPU1 core and shader clock is working at full speed MHz as it should for 3D games. On the other side your GPU2 core and shader is idlling at the lowest MHz speed (in order to save energy).
Only this shows that your GPU2 is not activated.

This is step #1 to know that something is not working as it is supposed to be.

Only AFTER you have GPU1 and GPU2 working at full speed, then you need to check
GPU1 usage vs GPU2 usage
BOTH GPUs should be working in the area of 75%-95% in order to have the SLI system working.

I do not know why you experience so many problems, I am sorry for this.

PS. run the game in window mode when you do your tests, just to make sure you imitate the same testing conditions as I did in my rig.

~S~

Its simply not working for me. Tried every conceivable configuration. Thanks for the feedback...That kite surfing sounds awesome. Saw some of that recently in Key West. Looks fun as hell

This is why:


03-31-2011, 06:14 AM

+1

Thanks, GRAthos! :)

Some comments post-patch beta:

I did not notice any change to the fps rates before - after beta patch.

The game seems to have less stutters when flying over areas with a lot of buildings.
Flying above London is much better now. There is still some stutter flying at medium alt during the first pass (while the GPU is loading the building details). On the second fly over there is no stutter at all.
Flying low above London gives no stutters at all (smaller view - less buildings to load ;) )

Could not notice the same improvement flying the Bf109 over the French harbour though, it still gives a lot of stutters.

The amount of VRAM usage ist still high, my VRAM goes quickly to 1 - 1.2 Gb used (my cards have 1.3Gb VRAM) so I will stick to my recommendation that only 3Gb VRAM cards are the ones to go for.

~S~

Can you please tell me what psu your running with your sli configuration? I have 850psu with one gtx 570, thinking I may need two to really run this game well..have done lots of search on boards re psu for this card in sli, 850 should work, but there are others who are saying 1000 is the min, that the tests done were only with the gpu at idle, and not full..thanks!

I have 1100W

I do not have the consumption ratingsat hand but this information "that the tests done were only with the gpu at idle, and not full" is incorrect.

Most GPU tests I have seen provided information on power consumption at idle, middle and full usage so you should be able to find the numbers you need.

Somebody raised the same question like you in this forum:
http://www.tomshardware.com/forum/31...er-consumption

Anyway, this will solve all your questions:
eXtreme Power Supply Calculator Lite v2.5
http://www.extreme.outervision.com/p...ulatorlite.jsp



I think you will probably not. For the low resolution you have, at the current state of the game (beta patch) I would hold on my money and wait for the next generation of NV cards.




~S~