I would stick with one gig of ram...I just bought a second gig and installed it...All that second gig is good for is eye candy...And I'm running 2 gigs worth of Kingston Hyper X PC4000
__________________
My computer (The Deathstar(Built just for Doom 3 minus the Nvidia recommendations)):
Thermaltake Xaser 3 Series Black w/ Window Case
Thermaltake 480 Watt Silent Purepower Power Supply (very noisy, wouldn't recommend it)
Asus P4C800E-Deluxe Motherboard
Intel Pentium 4 3.2 Ghz Northwood Processor w/ Thermaltake Spark 7 (Took off fan grill and I am using Arctic Silver 5)
2 GB Kingston Hyper X PC4000 Ram
ATI/GeCube 9800XT 256MB Ram Encore Edition
Sound Blaster Audigy Gamer
Windows XP Pro