I need 4 DVI monitor outputs

Please forgive me if this question has already been posted and answered...
Currently my teacher-station computer has an NVIDIA GeForce 8800 GT with 512MB of GDDR3 memory and two dual-link DVI ports. I need to be able to hook up 2 more monitors. Can I simply install a second identical card? Does the second card need to have its own power cord?
Thanks, in advance if you can offer any help.
My teacher station computer info:
Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 12 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4
Serial Number (system): G8823395XYL
Hardware UUID: 01C05849-50A7-5263-B65A-28FDD09AFE88

Currently my teacher-station computer has an NVIDIA GeForce 8800 GT with 512MB of GDDR3 memory and two dual-link DVI ports. I need to be able to hook up 2 more monitors. Can I simply install a second identical card?
Yes. It may not be easy to find. Make sure it's made for the 2008 Mac Pro. It has to go in slot 2.
Does the second card need to have its own power cord?
Yes.

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