Anna,
I order to get SLI working correctly, both video cards must be of the same chipset. It is highly recommended to have the same cards, as different vendors may use the same chip, but may not correctly communicate between each other.

Tim.
 -------------- Original message ----------------------
From: "z.Fenna6" <[log in to unmask]>
> I have an EPox EP-9NPA+Sli mobo with onboard Nvidia geForce 6600 video.  I 
> installed a video card when the PC was built - VGA PNY 6600 256M, but when I run 
> SIW for a system scan, it shows the Nvidia video (hardware & drivers) but NOT 
> the PNY card.  I paid a small computer reseller to let me build the PC on their 
> bench and to check it when I was done.  Apparently something is not right.  Can 
> anyone help me?
> 
> Thanks,
> Anna Summers
> 
> 
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