Blinking screen in SLI mode

[Oldjazz]

Hi guys!
I've bought 2 Leadtek 7900-GTX and when I run 3Dmark03 or 3DMark06 (didn't try other Benchmark yet)
I'm getting some problems, at the end of the test I'm getting a blinking screen and I can't see the results but tried those two Bench with one of my two 7900 GTX and I got no problem, no blinking and can see results, I only get that problem when in SLI mode.

I've installed a new game for my son (Lego star wars 2) and when he exits it, it does the same trouble, the screen blink untill I go into the Nvidia properties and uncheck the ENABLE SLI MULTI-GPU check box then hit apply and the blinking is gone without rebooting my PC.

Does someone have any clues about that trouble?
and I can't get more than 500fps (in the first Ghost Recon) at looking at the sky.
I know that 500fps is a lot but I heard that some peoples get over 1500fps with one card and I'm getting less than 500fps without the SLI mode.

Thanks

 

[Oldjazz]

it look like I'm the only one that have that problem.

 

[Nagisaki]

Are both cards connected securely with the SLI link? Also, does your motherboard have any power inputs near your videocards (Asus calles these "EZ-plug" or something like that, usualy 4-prong) that are not connected? Lastly, what SLI mode are you running in?

 

[Oldjazz]

Hi! thanks for answering me.

The bridge wire between them is already on.
It's already pluged into the EZ_Plug.
For the what SLI mode I'm running, I'm not sure exactly what you mean by that, they are single GPU so only one SLI link and only a check box to enable SLI.

Thanks for your help.

 

[Nagisaki]

Open the nVidia control pannel, go to Performance & Quality settings. Just above the box with various options in it, there'll be a drop down menu with basic settings inside of it, change it to advanced. Then, scroll down until you see SLI mode. By default, it is on auto select. Try changing it to various modes to see if any of them do not cause the error.

I hope this helps.

On a little side note, that MoBo of yours, rocks hard <- has the same one

Edit: Oh, and have you tried both cards in single mode, or just the default primary one? If you've only tried the one, and you still get the crash after trying various SLI modes, try changing your primary card to the other one in the BIOS (I forget exactly how, if it comes to this I can write up a way to do it when I get home to my machine)

 

[Oldjazz]

It's on SLI antialiasing, I've tried 3DMark 03 again and 3DMark06 in single and SLI.
3DMark03 in single results are : 10470 in 1280 x 1024
3DMark03 in SLI results are : a blue screen

3DMark06 in single results are : 5762 in 1280 x 1024
3DMark06 in SLI results are : 5616 in 1280 x 1024

So in 3DMark06 no more blinking in SLI but less performance
I saved the results in excell documents.

In bios I set it up to PCIe1->PCI->PCIe2 and have connected the monitor into the one that is on the blue PCIexpress.

 

[Nagisaki]

SLI Antialiasing decreases performance since it runs in either 8X or 16x antialiasing mode at all times, but it makes things look prety. Try one of the other modes to reduce the stress on the GPUs. Alternate frame rendering might be good.

Oh, also, when it gives you a blue screen, what is the error it says?

 

[Oldjazz]

Hi again!
Thanks alot for your time man.

I've try it on Alternate frame rendering and Alternate frame rendering 2, the results was 5321 for the first one and 5890 for the second one.

So from 5762 for one card and 5890 for two ?????
It's not a great deal but when I read "Fall '06 NVIDIA GPU Refresh - Part II: GeForce 7950 GT and SLI" in anandtech first page that you can find here:
http://www.anandtech.com/video/showdoc.aspx?i=2833

You can see that my cards are the fastest WHEN IN SLI but it's some numbers that I can't reach and I can't find why?

I'll do more test tomorrow and when I'll get the blue screen I'll right it down and translate it in english and post it here.

 

[Oldjazz]

I'll take out one card and run a benchmark then exchange it with the other one to see if both are working well but since they came from the store I don't think that it's the cards the problem, I think it's the drivers.

Do someone have a leadtek 7900GTX videocard and played Ghost recon with it?