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As it is now I had a rather interesting experience last night where I installed a dual boot setup at my rig to be able to run Rise of Flight on XP 32-bit instead of Windows 7 x64. This was all on the recommendation of Jason himself as he meant that RoF runs better on XP than W7 x64 if you have dual core system. Tried it and RoF is a new game to me. No stuttering at all that I had before and definately higher fps. The real benefit was the lack of stuttering that plagues RoF on some dual core systems when running W7 x64.

For games using less than 2 Gb (97%?) XP32 is really the fastest gaming OS - unfortunately there is no Dx10 and 11... The cause is probably the more direct access to the hardware that you have in XP without a lot of stabilizing hardware abstraction layers... A 64-bit OS is really not any faster than a 32 bit system - you just get access to more memory. Than of course Windows 7 is more optimised for multi threaded applications - but as seen in the case of RoF it messes up the threading they use at least compared to XP. For quad core CPU's it seems to run fine on x64 though!

unfortunately there is no Dx10 and 11...