Eyefinity,CDU II and a PFD/ND on 2 cards?

Hi outhere,

I am as many other sim-enthusiast trying to gain the best out of my flight experience with FSX and after 4-5 years of development its time for me to upgrade with MCP,EFIS,CDUII and a second monitor for PFD/ND for my NGX.

Currently i have a single ATI HD5870 1GB card which controls 1 main LCD ,1 PFD/ND Monitor and the CDU II by Vrinsight.

Now if i want to take the sim to a new level by adding eyefinity and 2 extra LCD with same resolution i guess for my main views would it be possible to add a second card (HD7970 for instance) and still having the CDUII and the monitor with the PFD/ND??

If YES : Would it be a disaster regarding FPS ?

IF NO: Sad but i will probably by a HD7970 anyway because of the new DX10 scenerys that eats alot of Videoram

Thanks in advance

Michael