HT4279 1 DVI + 2 mini port to HDMI adapters?

Has anybody tried this?  I've currently got 1 DVI (30" connected to the DVI port) and a 2nd HDMI monitor (via miniport to HDMI adapter).  Can I add another HDMI monitor similarly?  There is no documentation on this configuration that I've been able to find.
Thanks

Possibly?  But you really should have posted which video card you are using.  Lacking that I'll assume you have a 5x70 card.  With these card, to support three monitors there are some rules you need to follow.  Read the following:
Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
Mac Pro (Mid 2010), Mac Pro (Early 2009): Issues with three displays and multiple DVI, HDMI connections
The general gist of these articles is that you need two active adapters to run thee monitors on 5x70 cards.
Here's a good explanation of what's going in here and why you need two active adapters on these cards:
Active vs. Passive Displayport adapters *the truth*
Your problem is there are no active adapters that I know of for HDMI connections.  And this problem is compounded by the fact that you need dual link DVI to drive the 30" monitor.
I can see one possibility (not exactly that cheap).  You could put the 30" on a mini-displayport to dual link DVI adapter.  That would satisfy one of the active adapter requirements.  Then you could use the following,
DVI & S/PDIF Digital Coax/Optical Toslink Audio to HDMI® Converter
That would satify the second active adapter requirement.  I know it does because I use one of these for my TV (I also attach the S/PDIF into it to pump video/audio to the TV).

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