Mac, Operating System

How to : boot 64-bit Snow Leopard


How to check your Snow Leopard whether boot at 64 mode currently.

  1. Mac Logo -> About This Mac -> More info
  2. Click on Software heading
  3. Check the 64-bit Kernel and Extensions whether for Yes

How to : boot 64-bit Snow Leopard

Method 1:

Hold 6 and 4 keys during boot at Snow Leopard. This method only active one time

Method 2 (Recommend):

Edit this file:


Remark: It must require root permission.

Found this:

<key>Kernel Flags</key>

Change to:

<key>Kernel Flags</key>

Method 3:

Open Terminal console type:

nvram boot-args="arch=x86_64"

It is set boot-args to use 64 bit kernel