Windows 7 - Need advice on dual HDMI setup from Desktop

Hello all -

I am wanting to put together a PC that will display one PowerPoint on each two different HD TVs. These PowerPoint's will contain different content and could occasionally have sound, can this be done with a dual HDMI graphics card?

If so - I did see discover the Intensity Pro from BlackMagic - but it requires a PCIe slot. I'm hoping to use an existing PC we have laying around - typically Dell Optiplex GX models, which have the old agp on the motherboard. Alternately, a hdmi converter box may work, but key is to have different video/sound to each TV from the one unit.

Thanks for input!
J