What about 64-bit applications?

Some time ago I wrote in this same section, asking what was happening with the 64-bits on Leopard.
http://discussions.apple.com/thread.jspa?messageID=6990310
So everybody told me that all was running 64, and that if I wanted I could try to write an app and see what was happening.
So that's what I did, in the compiler options I specified only the x86_64 flag, and I launched a trivial application. So, that's what I got in the Activity Monitor...
http://img77.imageshack.us/img77/6325/imatge1ll4.png
And in the terminal, if I ask for information about the file, I get:
jpcman@Rainforest:Debug$ file Prova1.app/Contents/MacOS/Prova1
Prova1.app/Contents/MacOS/Prova1: *Mach-O 64-bit executable x86_64*
But if I run the same with any program of Leopard I get:
jpcman@Rainforest:~$ file `which ps`
/bin/ps: setuid Mach-O universal binary with 2 architectures
/bin/ps (for architecture i386): _Mach-O executable i386_
/bin/ps (for architecture ppc7400): _Mach-O executable ppc_
And still:
jpcman@Rainforest:~$ file /Applications/Preview.app/Contents/MacOS/Preview
/Applications/Preview.app/Contents/MacOS/Preview: Mach-O universal binary with 2 architectures
/Applications/Preview.app/Contents/MacOS/Preview (for architecture i386): _Mach-O executable i386_
/Applications/Preview.app/Contents/MacOS/Preview (for architecture ppc7400): _Mach-O executable ppc_
Why??
*Why all Leopard is running on 32 bits?* Why all other applications as well? If you can compile into universal binary with PPC and Intel, *why there is any 64-bit version anywhere* ?

Your MBP will run Mac OS X 10.5 Leopard just fine.
As for 64-bit applications, you will find that most application developers will release them as a single version so it will automatically use the rght binaries for your MBP. There will be the odd application that will be 64-bit only however those will be very specialised and not for general use.
For maximum performance the SODIMMs should be matched however the difference you will actually get will be minimal. Realistically you should have 2GB (2 x 1GB) installed anyway to get the most out of your MBP.

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Helpful and Handy Links
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tjmx
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When I said I doesn't work- I meant It started and
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Message was edited by: Zzapp

How to run D2k 32 bit Application on Windows 7 64 Bit

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