Hi Sander, GPU is not used during editing or preview rendering. The accelerated export with certain Nvidia cards uses another plugin for the cards on export. It is specifically for H.264 export only.
If you want your system to handle HD better, I’d start by upgrading your RAM from 2Gig (minimum for 1 app open) to the max you can afford and your OS can accept. 32-bit OS only can see 3Gig, 64-bit can go upto 128Gig (limited by motherboards). I’d say 8Gig is about right for HD editing. Hard Drives in a RAID 5 is going to speed read write and having that in a server takes the stress off your Editing machines CPU to run the RAID and the drives so that speeds things up again.
HD seems like such a normal editing format these days but it’s actually stressing DV based machines to a point where the configuration needs to be so much more. My clients are still wanting to go out to DVD so I shoot in HDV and edit in DV. But those out there using Tapeless formats are just going to need a system that runs optimal for HD.
Bottom line, it all comes down to Hard drives read write speeds, separated from the applications (actual drive not partitions), RAM, and CPU. GPU comes into After Effects, but not really Premeire Pro until you export only for H.264 using the Nvidia plugin that certain supported cards can utilize.
1st thing you should do is upgrade your ram and even the OS to Vista 64 or wait a little and get the Win7 64 so you can throw as much ram as you can afford (motherboard can accept) in the machine.
– JB
Jon Barrie
aJBprods
http://www.jonbarrie.net