Mac Pro -- 3 monitors?

Hey All,

I've got a brand new Mac Pro (single Radeon 5870) and I'm trying to connect three monitors to it. I've got two 22in Dell's and a 19in dell. The 22's will run at 1920x1080 and the 19 runs 1440x900. However when I plug all three in (one via DVI and two via mini display to dvi adapters, only two of the monitors get recognized. I've even tried using a mini display port to Dual Link DVI adapter to no avail. Anyone have any ideas? It shouldn't be this complicated

Thanks!

you will need one of these for the 2nd additional monitor

NewerTech NWTVIDU2DVIA USB to HD Display Adapter... in stock at OWC

I'm sure you have loads of reasons to buy a new Mac Pro but there is this little snippet of info...
Mac Buyer's Guide: Know When to Buy Your Mac, iPod or iPhone

good luck with that ever you decide to keep/return