When you enable surround it uses both GPUs to render frames, and you can't turn that off completely. However, you might try enabling SLI/surround then using a program like Nvidia Inspector to disabled SLI for only the FSX driver profile so that it only uses one GPU, and see if the SLI related issues still occur.
If the issues still persist even with SLI disabled for FSX, then you can try AMD Eyefinity (it only requires one card). The Matrox TH2Go is another option, but you wouldn't be able to run your monitors at 1920x1200, due to bandwidth limitations on the Matrox TH2Go.
Thanks, I'm already using Nvidea inspector with an FSX profile set up by one of the Flight sim guru's, I'll go check SLI settings in that.
but having said this, was on FSX last night and tried it once more in SLI and although there was no performance increase there was no performance decrease either, even better it worked properly with no missing textures this time in about 2 hours of testing different scenario's ... not really sure what happened last time? so good news there.
Another question? apart from the single 27" Hanns G 1920 x 1200 just now (that I plan to buy two more) I have a
24" Dell LCD 1920 x 1200 that I could maybe hook up for dual screen surround in SLI for FSX ... would this give me an indication to FSX working properly when I go on to buy the extra two Hanns G screens for triple screen? I might be able to borrow a 27" 1920 x 1080 screen too to test three screens, bit of a hassle getting it here though.
My gut feeling is its going to work, there must be lots of other folk with hardware like mine and I've certainly seen lots of triple screen FSX set ups, they cant all be ATI Eyefinity or Matrox TH2G's :) I really need to be sure though.
If I cant get FSX working in surround I'll not be going eyefinity I'm afraid, I'd lose too much selling on these new and fairly new GTX570's and as you point out the Matrox triple head is bandwidth limited for the resolution I'd need to use.
Thanks very much for all help so far :rockout