3 monitors support? Pegasus ADD2 Card: Dual-DVI PCI

Hi,

I am using thinkcentre M55 8811 model...

Currently I am using onboard video(q965) with add2 card with one dvi display(2 display simultaniously)...

I want to have 3 monitor display...I found one dual display add2 card, does it mean it will allow me to use 3 display simultaniously??

http://www.wintecindustries.com/orderdesk/products/prod...

I bought new dual dvi pci-x16 card(visiontek hd4650) but that disable onboard video, which means i still have only 2 displays...

Box has 300w power only...so not sure if additional pci card will gimmi 3rd video?

Appriciate any help...

Thanks ~ Prakash