Ok here is what to do.

start up FS9 goto settings in the game then choose display settings.  On the hardware tab at the end untick Anti-Alias.

Now quit FS9

Now get up your display properties. click on the advanced button then the tab with FX5900 so you get the options up to alter your cards performance.  I think you need to choose Image quality or somthing from menu.   You should see the words Anti-Alias and Anstropic filtering on the list.

Click on Anti-Alias.  Untick application controlled and set it at 4X

Click on Anistropic Filter. Untick application controlled and set it to 8X

Click Apply then OK.

Run FS9 should look much nicer now    If it is hitting your FPS to much either lower 3D clouds a bit or lower the Anti-Alias to 2x though this means you might see a few jaggies.

Hope you understand all that garble and hope it works 

would i want to put the first one on 8x if i can

allright much better but with big weather fr drops to around 9

i have my AA on 8x and works fine with me but yours is a 5900 converted into 5950 ultra so dunno if it will work you could try it and see what performance u get.