Weird Memory behavior on a Quad G5 8 GB, --- memory limited to 6 GB

Hello
I am using Kontakt 2 standalone that I load 3 times with 3 different banks (Strings, Winds, Brass)
I cannot use more than 6 GB of Memory ( see figures after)
Figures ar given by "Activity monitor"
When I load String, brass and winds in that order :
- String : real = 2.7 GB Virtual memory = 3.34 GB
- Brass : real = 2.33 GB Virtual memory = 3.39 GB
- Winds : real = 237.45 Virtual memory = 2.20 GB
When I load Winds, Brass and strings in that order :
- Winds : real = 2.01 GB Virtual memory = 3.34 GB
- Brass : real = 1.63 GB GB Virtual memory = 2.21 GB
- String : real = 442.66 MB Virtual memory = 3.39 GB
Each time MenuMeter is reporting around 6 GB used and 2 GB free
Is it a Kontakt 2 problem or is it a MAC OS X behavior ?
Is there is a parameter to tell MAC OS X that it can use up to 8 GB ?
Thanks in advance for your help
Best
Cyril
Quad G5 8GB with Motu 2048 (24outs) +G5 2x2 3.5GB + Motu system (60 ins/12outs) Mac OS X (10.4.3) Raid 0 of 6 x 10 000 rpm Raptors+ +QLSO Platinum +Kontakt 2

WORK WITH...yes. CAPTURE WITH...no. ProRes requires an INtel Mac to capture...or hardware with onboard encoders like the AJA I/O HD. And note...ProRes HQ is for 2K footage and higher...designed for RED. Regular ProRes is what you want to use. Both are 10-bit, and ProRes looks great, and is 2/3 the size of HQ.
IF you want work with ProRes, you need to upgrade to FCP 6. The codec does not come with, FCP 5. If you upgrade your QT to 7.5.5 or higher it has a built in decoder, but that allows playback only.
If you stick with FCP 5, you need to either infest in a big Raid to handle uncompressed, or capture to DVCPRO HD, which is a fine codec. Especially working with HDCAM...both are 8-bit formats.
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