I have been editing DVCam footage for 2 years on an old G4 500MHz dual, and just bought & am setting up next couple weeks, a refurb G5 dual proc. 2.3GHz from the Apple Store. I'm purchasing 4.5 Gig of RAM intitially and this unit should scream in comparison to the old G4 with the DVCam format. However, in talking with a fellow videographer / other company I shoot for frequently yesterday, it appears the required change over to HDV equipment ("HD" on DV type cassettes) is literally only 3-4 months away for us. I know that the files will be much larger and the need for speed much greater, and hope I'm not back into the situation being frustrated by too slow rendering / processing when that happens. Would going to the max 8 gigs of RAM when the time comes go a long way to help with that or with Final Cut 5 (HD capable) is there a dimished return factor with the RAM at a certain size? Real newb question here....is any other memory such as cache upgradeable in these machines, or any other tweaks to make it perform with even more speed. Thanks for any thoughts.