Cannot switch Logic Pro to 64bit

Two potential reasons:

1. You don't have Logic Pro 9.1 or later (9.1.6 is the current version). Older versions are simply not 64-bit
2. You bought your MBP earlier in 2006, these machines don't have a 64-bit CPU

Also: with 2GB of memory there is NO reason to run 64-bit applications. 64-bit becomes an issue with more than 4GB of physical memory.

One of the main points of 64-bit is to access RAM above 3.7GB. As BB mentions, there's no performance benefit running 64-bit on a low memory system. Plus, if all of your plugins aren't 64-bit compatible, you'll be in a world of hurt.

Hi

To add to this:

http://support.apple.com/kb/HT3989

CCT

Hi

GTBannah wrote:

Thanx for the responses, but I'm still trying to understand why the 64-bit option is absent.

Probably because you do not have a recent enough Intel Processor. What is the specification of your Mac?

CCT

Hi

Perhaps this will explain?

http://support.apple.com/kb/SP567

Logic Pro 9.1 and MainStage 2.1 require Mac OS X v10.6.2 or later and an Intel Core 2 Duo processor to run in 64-bit mode.

Later versions of Logic/MS need a later version of the OS, but if you don't have an Intel Core 2 Duo you are out of luck.

CCT

Note the difference...

There is a mobile "Core Duo" processor that is 32-bit only

It's the "Core 2 Duo" that is 64-bit capable.