EDIT:
You honestly have no idea what I'm talking about do you? I'm going off the system requirements for the software he's building this rig around. Not whatever the heck it is Vista needs, which is completely irrelevant.
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I have no idea where your looking at these system requirements but heres the text right off the company web page.
Minimum system requirements for Media Composer Software - Windows
Processors:
* Intel Core 2 Duo 2.33 GHz
System Memory:
* 2GB of RAM
o Note 1: If working with complex sequences, (multiple effects/streams) or compressed HD resolutions 4 GB of RAM is recommended.
o Note 2:
Vista requires 4 GB of RAM
Graphics Card:
*
NVidia Quadro FX 560 or higher
o Note 1: Only Nvidia cards are supported
o Note 2: Full Screen play feature requires a minimum of 128MB of graphics memory
Heres a link in case you don't believe me
Avid Media Composer Software
When we're talking about rendering and the kinds of tasks his rig will likely be doing then h*** yeah more memory will help. These applications are total resource hogs.
I don't get what you mean by linking the 780i board... You're just undermining your prior point. Good motherboards aren't cheap, get over it...
Newegg.com - Patriot 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory - Desktop Memory
8 gigs for under 400. Not even 2 years ago I paid 250 bucks for a high end 2gb kit of memory. These days everything is cheap.
Look things up next time properly so you don't spread wrong information.