Adding more ram won't make it one bit faster for anything requiring any serious number crunching, like video encoding.
At the end of the day that 1.6 Ghz processor will only do X number of calculations per second, you'll be waiting all day for that video to be finished.
I get a huge kick out of those guys that start threads looking for the best laptop for video encoding
if they were truly serious about working with video they would be getting something a little more suitable, like the workstation I just finished building:
2 of these: Xeon W5590 Nehalem-EP 3.33GHz 4 x 256KB L2 Cache 8MB L3 Cache LGA 1366 130W Quad-Core
Total of 8 physical cores, 16 virtual
http://www.newegg.com/Product/Produc...82E16819117214
SUPERMICRO MBD-X8DAL-i-O Dual LGA 1366 Intel 5500 ATX Dual Quad-Core Intel Xeon Processor 5500 sequence
http://www.newegg.com/Product/Produc...82E16813182192
8 gigs ram, (8 more on the way) DDR3 PC3-10600
ASUS EAH5770/2DIS/1GD5/V2 Radeon HD 5770 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
http://www.newegg.com/Product/Produc...82E16814121355
CORSAIR CMPSU-1000HX 1000W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS
http://www.newegg.com/Product/Produc...air%20HX 1000
COOLER MASTER ATCS 840 RC-840-KKN1-GP Black Aluminum ATX Full Tower Computer Case
http://www.newegg.com/Product/Produc...82E16811119187
CORSAIR Cooling Hydro Series CWCH50-1 120mm High Performance CPU Cooler
http://www.newegg.com/Product/Produc...-010-_-Product
Windows 7 Pro 64 bit
It will run 3 open Procoder windows each running batch WMV encoding at 1.8X realtime,
and it's only using 60% CPU
This thing fucking scares me
(and yes I am bragging just a little bit)