I've not tested the Dual-Link DVI adaptor... it will be interesting to see if it adds any frame delay?!?
DH2G will work on the single-link DVI port.
I tried the TH2G on both ports of the 4870 graphics card in a 2.26G 8 Core mac - the resolutions are quoted above.
1st set = Single Link port
2nd set = Dual Link port
so:
1x 2560x1024* + 1x3840x1024
seemed to be the maximum with the TH2G
The quoted resolution is 2560x1600 - However, the actual maximum depends upon what is connected - I've only tested with TH2G so far
HOWEVER - DO TEST your own configuration to ensure that you get the expected results...
Simon