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this Apple's link is misleading. Type of processor alone does not describe the "bitness" of the OS. E.g. Core 2 Duo Macbook Pro can well be running 32-bit OSX 10.6. To find this out exactly, click "Apple"->About this Mac->More Info->Software. You will see something like the following:

System Software Overview:

System Version: Mac OS X 10.6.8 (10K549)
Kernel Version: Darwin 10.8.0
Boot Volume:    MAC
Boot Mode:  Normal
Computer Name:  SPMS-00373
User Name:  xxxxx
Secure Virtual Memory:  Enabled
64-bit Kernel and Extensions:   No
Time since boot:    21 days 2:59'

Note the line " 64-bit Kernel and Extensions: No". So this is a 32-bit system. Even though it is Core 2 Duo:

Hardware Overview:

Model Name: MacBook Pro
Model Identifier:   MacBookPro5,5
Processor Name: Intel Core 2 Duo
Processor Speed:    2.26 GHz
Number Of Processors:   1
Total Number Of Cores:  2
L2 Cache:   3 MB
Memory: 4 GB
Bus Speed:  1.07 GHz
Boot ROM Version:   MBP55.00AC.B03
SMC Version (system):   1.47f2
Serial Number (system): W8940CYK66D
Hardware UUID:  B21EB0CD-821D-581C-944A-6B7006F784B8
Sudden Motion Sensor:
State:  Enabled

Some systems can be booted into 32-bit as well as into 64-bit modes using certain key combinations. See http://support.apple.com/kb/HT3773

this Apple's link is misleading. Type of processor alone does not describe the "bitness" of the OS. E.g. Core 2 Duo Macbook Pro can well be running 32-bit OSX 10.6. To find this out exactly, click "Apple"->About this Mac->More Info->Software. You will see something like the following:

System Software Overview:

System Version: Mac OS X 10.6.8 (10K549)
Kernel Version: Darwin 10.8.0
Boot Volume:    MAC
Boot Mode:  Normal
Computer Name:  SPMS-00373
XXXXXXXXXX
User Name:  xxxxx
Secure Virtual Memory:  Enabled
64-bit Kernel and Extensions:   No
Time since boot:    21 days 2:59'

Note the line " 64-bit Kernel and Extensions: No". So this is a 32-bit system. Even though it is Core 2 Duo:

Hardware Overview:

Model Name: MacBook Pro
Model Identifier:   MacBookPro5,5
Processor Name: Intel Core 2 Duo
Processor Speed:    2.26 GHz
Number Of Processors:   1
Total Number Of Cores:  2
L2 Cache:   3 MB
Memory: 4 GB
Bus Speed:  1.07 GHz
Boot ROM Version:   MBP55.00AC.B03
SMC Version (system):   1.47f2
Serial Number (system): W8940CYK66D
XXXXXXXXXX
Hardware UUID:  B21EB0CD-821D-581C-944A-6B7006F784B8
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Sudden Motion Sensor:
State:  Enabled

Some systems can be booted into 32-bit as well as into 64-bit modes using certain key combinations. See http://support.apple.com/kb/HT3773