Hardware graphics question

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http://www.linuxquestions.org – I have a Sun Blade 1000 and it has been working nicely for a long time. It came with a PCI ATI graphics card. It has a VGA and DVI connector. Does that mean I have dual head capabilities? I have so far only used it with a monitor connected to the VGA output. I checked up on the possibilities for a more fun graphics card, and finally bought a SUN Elite 3D m6- It would fit nicely in the topmost slot. But the sound outputs are there, so I put in the loser slot. That slot though, has another unused slot inline. Bottom line: Can I run both cards simultaneously and have three monitors connected? (HowTos)