QUOTE (VulcanB2 @ 23/08/2009, 23:30)
There is no advantage to running FSX on a 64-bit OS, other than it more reliably allowing FSX SP2 to access memory over 2Gb.
Even a 32-bit OS can access memory up to 4Gb, but the standard process memory is limited to 2Gb.
In XP, the hack to allow a 32-bit process access to more than 2Gb of memory is to use the /3Gb switch, but you must know what you are doing to continue reliable operation of the system with this enabled. FSX SP2 has been modified to incorporate the /LARGEMEMORYAWARE flag in its executable.
There is much rubbish spoken about memory, and I'm annoyed to say I was mis-led on this issue as well until recently (specifically the memory addressable under 32-bit OS).
32-bit permits addressing 4,294,967,296 bytes (4 Gb) of memory, but I figured that because some of those address lines were taken for hardware access, that this reduced. I was wrong, as there is a seperate line that is switched to tell the system it wants memory access, as opposed to hardware access, so all 32-bit lines are available for addressing memory.
FSX can use any 2Gb of memory under XP WITHOUT the /3Gb switch, and 3Gb of memory with the /3Gb switch.
Vista by default allows this under 32-bit and 64-bit.
64-bit permits more memory to be accessed in total, but does not alter the behavior of the 32-bit process.
Finally, Windows 7 RC1 32-bit is so far, absolutely fantastic. It is quicker than Vista (I have the 64-bit version of Vista Ultimate). I'm not sure what the 64-bit version is like though (I haven't tried it yet).
I would also wait until more people try the RTM build of Windows 7, as I heard a few things were broken in the release build that were working in the RC1.
Note also that Windows 7 version is 6.1, whilst Vista is 6.0.
FSX runs quicker under Windows 7 than under Vista or XP. This is not heresay - it's fact. I've seen it for myself.
I would wait a bit longer, and read reviews on Windows 7 RTM. You might very well be best to pre-order Windows 7, rather than getting Vista.
I appreciate very much your detailed reply to me.
You are actually confirming what my tendency was. To go for w7 after its RTM release. I would prefer although the 64 bit, not quite sure why.
I would be very much interested to hear your comments on the 64 bit if you later do it.