Hi all,Since i own a HD4850X2 i was curious if crossfire was working in some of my other games (yes i know, fsx doesn't support it).Using CPU-Z i noticed that in fact it wasn't in any of my games, which is strange, cause some of them definately support it.After some reading, i found out i had to download the ATI application profiles, which enable crossfire support.Something i actually had never done before, even though i have my HD4850X2 for quite some time!To enable the feature, i also had to enable the Catalyst A.I (advanced) option in the Catalyst Control Center, after which i indeed had crossfire support for a couple of games.But the best part had yet to come!When i fired up FSX after installing the application profiles and setting the Catalyst settings as described above, i noticed my framerate in fsx had drastically improved!!!I gained a minimum of 5+ fps in the worst possible situation (MyTraffic 5.3 + PMDG 747 + NL2000 + UTX NightLightning + ASE Weather + REX Textures + FS Global) while approaching EHAM, which was a very welcome surpise. In other areas (fsx default sceanry and plane) i actually gained like 10+ frames going from around 30fps to nearly 50 fps!In fact, after using al kind of tweaks and hardware upgrades i never experienced this much of a gain in framerate (besides going to i7).I also tried forcing crossfire on fsx using Crossfire Xtension, which didn't work, BUT it did reveal that a fsx profile was present (as well as a FS9) which explaines my gain in frames.I'm posting this because i'm sure i'm not the only one out there who never knew you had to install these application profiles. So if you didn't and own an ATI card, i suggest you try it and see if it works for you!Happy flying!!!

Veeeery Interesting. Are you using more than one monitor in your set up?Clutch