I HAVE to do smth wrong - new comp and premiere still lagging

Hello guys.
Finally I bought new computer spec which is:
i7 930 @ 3.6Ghz
Gigabyte x58a-ud3r
8GB of memory: G.Skill ECO @1600Mhz CL8
GeForce GTX 460 @cuda hack
Two 1TB Samsung F3 drives
Windows 7 Ultimate 64-bit
My disks are:
WD Caviar 160GB (C:) for OS&Programs
Samsung F3 1TB (D:) for Media/Project Files
Samsung F3 1TB (E:) for Cache/Pagefile
The problem is, I've converted my 7D footage through mpeg streamclip to Avid DNxHD files, replaced the files in Premiere and in After Effects and what? There's no way I'd play the preview in real time :/ I got yellow bar but no way of playing it at least to the level when I can check my project before encoding it. Plus, encoding to FLV YouTube Speed options tooks 2.5hours :|
Am I really doing something wrong or what's going on?
Regards
Paul

http://www.usa.canon.com/cusa/consumer/products/cameras/slr_cameras/eo s_7d#Specifications
The
7D like other DSLR's record in the H264 codec which is normally
QuickTime unless it's flash. You can edit them natively in Adobe but the
compression ratio is as high as AVCHD which is another Mpeg4 based
codec like H264. You convert these files to Cineform if your system
cannot handle playback editing natively. Cineform's codec has a much
lower compression level which makes it far easier on the system to edit
and far less chance of artifacts when compositing or overlaying images,
video, or animation.  That is why you convert them. Also Quicktime has
not been updated as much as AVI so the performance is is not as good
with the current systems.
Eric
ADK
So this is what I knew and what I thought. Still, thank You Eric for clearing this out
We came to the point when we are sure that cause of my problems is not the format, neither the codec.
I've ordered another 4gigs of RAM, will check it tommorow when they arrive.
Btw, is it good idea to install all my Adobe programs on disk D (Samsung F3) and keep other programs on C (WD Caviar 160GB)? I am asking that 'cause I got plenty of space on D and Premiere runs much faster when it's installed on D.

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