Actually - thank you for suggesting it! I knew this bear was about as fast as I could make it, without paying for a four or five hundred dollar dedicated RAID card, but I really didn't know how fast (other than the obvious subjective effect). I was even kinda surprised by the actual numbers. I agree, though, that for your video editing, more RAM is likely a better investment. When I'm doing inteface development, writing PLC logic, editing large AutoCAD schematics, and writing 'glue' in Visual Studio, I can tell the difference immediately between Vista 32 and 64 - 64 is much more responsive, obviously because it can keep all the working files in RAM w/o having to swap, almost at all...
The whole RAID card issue is interesting: I originally wanted to boot Ubuntu on this thing, and just use it for e-mail, web, and skyping - that way I'd never have to expose windoze partitions to an outside world that seems intent on discovering two new security holes in it per week; after fooling around with every loader variant and every bit of advice I could glean, and having blown away, not one, not two, but four RAID arrays (and, even at 4GHz, it takes a while to format a terabyte of RAID1) trying to get it to co-exist, I finally decided to bite the bullet, switch to a 3870x2 card to support four monitors and leave a PCIe open, and buy a RAID card, which Ubuntu has native support for... Fortunately, before I placed the fatal order, I came to my senses and realized that, with a cheap case that included a PSU, a microATX with cheap on-board video, a Celeron that I keep around just for burning BIOS when the actual CPU is not supported by the shipping BIOS, and the left-overs from 'speed-binning' my own RAM, I could build an 'Ubuntu box' for way less than half what it would cost for the RAID card, much less replacing the video subsystem... One of those cool flashes, like the engineer who set out to improve the long-unchanged clothing iron, and wound up inventing 'wash&wear' wrinkle-resistant fabric!