Thanks for all your replies. Im glad I asked before I bought cuz you guys have bought up some important points that I had not considered for example the fact that its locked to one machine (license) and the 3.5Ghz RAM address limit. As a result of reading what you all have said Im gonna hold back for a bit and reconsider my options.
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I dont blame you all for wondering why I wanna downgrade because TBH I have got my Windows Vista running real smooth. Spent a lot of time tweaking it and its actually fast and stable now.
There is only one reason I want XP back - the lack of a
Horizontal Span option in Vista due to its WDDM architecture.
You see - I bought two identical monitors for one reason - to use the Horizontal Span function so two screens became one big display. I did this because I like to play Microsoft FSX and other games across two screens, the immersion in that flight simulator magnifies a hundred times when spanned across two widescreen monitors. Its something I did regularly on my old computer.
Anyway - along came my nice new Core i7 computer with Vista installed and - Vista has no Horizontal Span.
You have no idea what it feels like to go back from what was essentially a huge 3360 X 1050 display down to a single screen at 1680 X 1050
So thats it - XP can Horizontally Span and thats why I want it back
Will Windows 7 support Horizontal Span?!I will be surprised. Or is it too early to ask? Unless Im wrong W7 has Vista at its core which means H-Span is probably still not an option.
Thanks again for the replies its really helped!