Why won't the Thunderbolt port (Mini Display) on a 2011 MacBook Pro drive a DVI Display?

I'm trying to use a MonoPrice 5106 Mini Display to DVI adapter and a DVI cable to drive an Acer H233H 23" HD display.  I'm driving it from the Thunderbolt Port (Mini Display) on a 2011 MacBook Pro.  It doesn't work.  I use a similar MonoPrice adapter (5311) to drive the HDMI input on this monitor from the Thunderbolt port and it works fine.
I can drive the DVI input on the Acer display from an older iMac using a MonoPrice 4851 Mini-DVI to DVI adapter and this same DVI cable and it works just fine.
So, why won't it work from the MacBook Pro?  Do I need the much more expensive Monoprice 6904 dual link DVI adapter ($69)?  Why isn't this mentioned in the MacBook Pro manual or on the MacBook Pro support page?  MonoPrice says this 5106 adapter should work and if not to try the more expensive 6904 adapter.  Need a better reason to buy the more expensive adapter.
Help please.
Thanks,
Vee

Just saw your question.  Just like it's Apple counterpart, the 5106 is not capable of higher resolutions.  You should, in theory, be able to drive your Acer display at lower resolutions with the 5106.  And the 5106 may be sufficient for a 23" monitor . . . you'd need to check the maximum resolution for each.
But you definitely do need the 6904 for higher resolutions.  That's what 30" monitors and other high-res displays require.

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