I would certainly want to get some first hand feedback from someone running a 4870 if I were you, but for what it's worth I believe you won't have any problems.
I use a 4850 (which can't be that different from a 4870 internally, and driver wise) with 3 x 22" LG screens. The setup with TH2Go was completely painless, and all three monitors sync at 1680x1050 @ 59Hz.
I am not sure, but I think the ATi drivers will achieve 5040x1050 by syncing at 59Hz, and NOT at 57Hz. nVidia users always seem to be working with 57Hz, so I think it might be a clear cut nVidia / ATi difference.
If that IS the case (that nVidia will sync at 57Hz ALWAYS, and ATi sync at 59Hz always) then that makes me think that we should have two monitor compatibility lists - one list for those that definitely work at 57Hz, and those that definitely work with 59Hz (in the event that there are some monitors that do one or the other, and not both). I haven't seen any discussion on this at all so it might be something that exists in my head alone. :lol:
In any case, what I can categorically state is that LG L227WT monitors will happily deliver their top resolution at 59Hz :)
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