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Cannot Enable SLI

post #1 of 11
Thread Starter 
Hello, Im having trouble enabling dual SLI on my computer.

Iv got 2 GeForce GTS 250 (the top one 1gb and the bottom 512mb) with latest drivers
I have a nForce 750i SLI board (MB-75i_72P9 if it helps) Also with the latest drivers
4gb of DDR2
and a Core 2 Quad Q9400

I have heard that there are issues with realtec drivers for the sound card and nic so they have been disabled in the bios.
I do have an SLI bridge on the cards.
but the option for SLI still will not some up in Nvidia control panel.

Can someone help me please?
Thank You smile.gif
post #2 of 11
They have to be the same amount of memory otherwise they won't run together, Nvidia is 'uber picky about what runs together.
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post #3 of 11
Thread Starter 
I have run them together before in SLI a year or two ago, the one with 1gb only utilized 512mb. It was on the same board too, I have since then forgotten how I did it though.
post #4 of 11

Have you tested different drivers etc?

 
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post #5 of 11
Try this and see if it helps.
http://www.evga.com/forums/tm.aspx?m=1174372
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post #6 of 11
Quote:
Originally Posted by appleg33k85 View Post

They have to be the same amount of memory otherwise they won't run together, Nvidia is 'uber picky about what runs together.

not true. the driver will treat both cards as having the specs of the lower card...so both will show as having 512 while in sli
    
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post #7 of 11
Quote:
Originally Posted by appleg33k85 View Post

They have to be the same amount of memory otherwise they won't run together, Nvidia is 'uber picky about what runs together.

its like saying my 6790 wont xfire with a 6870. and dont tell me it wont, i have a graph!
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post #8 of 11
Every time I have gone to SLI after having run a single card I had to re-install the drivers to make the SLI option work. I don't know if there is another way around this but this has been my exp. No idea on nvidia and mis-matched memory. AMD does not care, I have heard nvidia does. I would remove your nvidia drivers and re-install them if you have not. Make sure both cards are in when you do it.
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post #9 of 11
Your going to have to try a program like coolbits and modify your registry.
post #10 of 11
AMD does not care, I have heard nvidia does. g.gif
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