I'm shopping for a new DAW, for which I don't really need to go cutting edge like this. But I'm curious as to whether anybody is using an i7-based system with Vegas, as it wouldn't hurt to future-proof the system a bit if it also includes noticeable immediate improvement for video work.
To give you a short answer, I saw a huge improvement in render times going from a Quadcore Q9550 to a i7Core 920...
Rendering a recent 1 hour 30 minute project took a little over 3 hours with the quadcore...
Same project with the i7 Core 920....Render time....1 hour 10 minutes...
Just rebuilt my PC with and an core i7 920 2.66 ghz processor and vegas Loves it.
I get faster editing, rendering and can even edit in HD.
I especially love see my effects, an transitions in real time.
The benefit for me; get my projects done faster,I can also make quick edit decisions on the fly....I was going to go AMD Phenom 2... but heck no.
With the current build of Vegas Pro you will see slight performance improvements if you are 32 bit. BIG performance gains if you are 64 bit. We don't know about preview performance.
That being said i7 motherboard, memory, and processor costs have come down so dramatically that if you are building a new system there really isn't a reason not to go i7.
The new Xeon chips that use the i7 architecture have just come out this week.
Dell, Lenovo, HP have new workstations with them. The new MacPro uses them too. Might be too pricey for a while, but the tech sites are raving about them.
I am VERY happy with mine. i7 920, 6 GB ram, ATI 4670 card, Liam Li server case (with wheels), 10 hard drives, water cooled (dual radiators), VISTA 64 Business (OEM).
I came from a dual-core AMD 4200, so it feels much faster. Editing is smooth and rendering is much faster (about 3 times the previous speed).
BTW, Vegasmon--I notice you are running 4GB of RAM. DDR3 is optimized for memory in multiples of 3, not 2. So 3 GB or 6 GB, 12 GB, etc. If you read the reviews you are loosing some speed using it in pairs like DDR2 ram.