advice on 3x monitor setup

[niggz]

Hey

Was wanting some advice on a 3x horizontal monitor setup. Using 120hz monitors.

Specs:
3x benq XL2420t
2600k
AMD 6990
8gb ram
1000w corsair PSU

So. Was wondering will i need to upgrade anything on my PC to be able to run the.3 monitors. Was mainly to play BF3 in 2D. And fps games.

Also is this the correct DP adaptors to get or should i be getting something different?
http://www.pccasegear.com/index.php?main_page=product_info&products_id=17083

Thanks for ur help :)