How to configure LR2 to use all installed RAM?

     Hoping to find some answers here about a problem I'm having with Lightroom 2.7. First let me give you some details about the computer I'm running LR on.
PowerMac G5 1.8Ghz single PowerPC CPU
8 Gb RAM
Mac OS X 10.5.8
Lightroom 2.7
Photoshop CS4
The OS acknowledges that there is 8 Gb of RAM installed, but in Photoshop, I am unable to assign any more than 3072Mb of RAM as that's all that's being seen by PS as "available". I can't find a configuration in LR to adjust how much RAM the software can be assigned.
I was looking around for a fix on this yesterday and saw a mentioning of running the software in 64-bit mode, but I am unable to find where that is enabled/disabled. Can anyone steer me in the direction I need to go or am I just S.O.L and bought a bunch of RAM I can't use in Photoshop and Lightroom like I bought it for?
Thanks.

I expected this, actually. The version of OS X that ran on most G5s was not "64-bit clean."  Meaning, only some aspects of the system were 64-bit, but it was not complete from user app to kernel. So you don't get full advantage of 64-bit.
Lr can see 4Gb of address space and use that. It will request as much or as little of that as it requires. Since you have so much physical memory it can do this without causing the rest of the system to swap.

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