What 24" Monitors do you have. And how do you find the HD4870x2. I have two of them going in to my new build.
I am running Gateway FHD2400's. They are discontinued, replaced by FHD2401's. I found a couple on Amazon and recieved them a week ago today. If you are picky about viewing angle, there are prolly others that are better. I have had mine for a year and love it. I did not find these listed as working on the monitor sticky (I need to go post that these work). So when I found the DTH2GO would do 59hz, I got 2 more and they worked, 5040x1050. The bezels are prolly a little wideer than others available.
The 4870X2? Its great. I have only had time to play HalfLife2 Ep 1&2, and Il2 across 3 monitors so far. I really don't notice any difference in play between 1@1900X1200, or 3@5040X1050. A couple spots in Ep 2 got a little choppy, which was odd, nothing really going on. Nothing seems to slow it down enough for me to complain about. Cept Crysis (blah), oh and it hates NeverWinter Nights 2 for some reason. I have heard people complain about not being able to get load temps below 90c! I keep mine on manual @ 40% fan and crank it to 60% before loading a game. Idles ~45, highest I have seen it load is 65 I think. This is in South Texas where my AC has a hard time keeping the house a comfortable 80F. Run the fans manual, or set up a profile, don't let the cards do it on their own.
Mark