Premier Pro CS4, Am I expecting too much from my system

i editing project contains video live concert: 4 camera, hd, wide screen p2 files. mxf files. anyhow, i've had better luck editing on my

laptop i5 4 gigs of memory , esata drive on desktop system outlined @ end of message:

 

i using multi-camera mode make cuts. in multicamera jittery , stops. if play timeline in program monitor (not blown up) works , plays video no problems. if play in full screen, it's jittery.

 

i've been pc guy long time i've considered buying mac pro , going final cut because i've spent days trying debug this. big investment! thoughts?

 

i've experimented putting cache, scratch files, , project files on different disks no better results.

 

my virtual disk 500gig, or 50000mb (i think calculated correct.) anyhow, minimum size number input 50000, , largest size same.

 

i have 6 gigs of memory.

 

help!

 

my system:

windows 7 professional (x64)

2.67 gigahertz intel core i7 920
32 kilobyte primary memory cache

motherboard
board: asustek computer inc. p6t deluxe v2 rev 1.xx

3 drives, 1 tb each, system , 1 other drive on raid 0
3rd drive non-raid.
all drives 7200

raw media on non-raid disk.
---------------
memory
6136 megabytes usable installed memory

slot 'dimm0' has 2048 mb (serial number sernum00)
slot 'dimm1' empty
slot 'dimm2' has 2048 mb (serial number sernum02)
slot 'dimm3' empty
slot 'dimm4' has 2048 mb (serial number sernum04)
slot 'dimm5' empty

------------------------
display
nvidia geforce 9800 gt (microsoft corporation - wddm v1.1) [display adapter]
samsung syncmaster [monitor] (19.9"vis, s/n h9lsa14300, october 2009)

do benchmark:  http://ppbm5.com

 

this instructive on whether have problems.

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