I have the Asus P5WD2 Premium and am runing Corsair VS1GBKIT667D2 1GB Kit DDR2-667 PC2-5300 Value Select on it and I want to upgrade my Ram. Here is my system build: P5WD2 Premium Pentium D830-Zalman CNPS9500 LED CPU Cooler Powercolor Radeon X800GT Corsair VS1GBKIT667D2 1GB Kit DDR2-667 2X512 Maxtor DiamondMax 250GB SerialATA 7200rpm w/16m Buffer (Media storage) BenQ DVD+RW Asus CDRW-DVD Lian-Li PC6070 Plus Case-Stock fans Antec NeoPower 480 Maxtor DiamondMax 10 6V300F0 300GB Serial ATA (3.0Gb/s) 7200RPM Hard Drive w/16MB Buffer (OS XP Media Center)) Samsung 215tw 21" widescreen monitor, Win-TV PVR500 I would like to add more memory to it. I had no clue what I was doing when I built this system and I used the least expensive Ram at the time. I would like to increase the amount of ram and I don't know if I should get another gig of the same or should I get 2 gigs of a different type? If I get a better ram do I need to remove the old? What is a good amount of Ram to run with this mobo? I mostly use my PC for multimedia and surfing. I record alot of TV and I stream video to a media center extender. I want good stable performace without spending a fortune. I do not overclock much since my case can't handle the heat in the summer. I have been looking at Corsair TWIN2X2048-6400 2GB Kit DDR2-800 XMS2-6400 Xtreme Performance Memory and Corsair TWIN2X2048-6400C4 2GB Kit DDR2-800 XMS2-6400 Xtreme Performance Memory Retail and Corsair TWIN2X2048-5400C4 2GB DDR2-675 XMS2-5400 Xtreme Performance Memory w/Black Heat Spreader I have narrowed my chice down to one of these three.the 6400 and the 5400c4 are about the same price. The 6400C4 is about $100 more. Any input would be appreciated. Thanks!!