I have always heard that the less cards in a single system the better.
Why not try two Sangoma A108DE cards (8 ports each).  Also make sure you
have hardware echo cancellation on the cards for this number of ports.

On Mon, 2010-02-22 at 14:20 +0100, Arjan Kroon | Mobillion wrote:
> Hi,
> 
>  
> 
> Does anybody have any experience with asterisk where are four PCIe
> cards are used in one server (TE420).
> 
> So you can have max 4 * 4 * 30 channels = 480 channels used.
> 
>  
> 
> Regards,
> 
>  
> 
> Arjan Kroon
> 
> Mobillion BV
> 
>  
> 
> 
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