Upgrading ram, please help

[Hexxie]

This will be my first time upgrading my computer, so i'm not quite sure what to do.

My computer specs:

Operating System Microsoft Windows XP Media Center Edition
OS Service Pack Service Pack 2
CPU Type Intel Pentium 4, 2947 MHz
Motherboard Name Gigabyte GA-8I915P Dual Graphic (3 PCI, 1 PCI-E x1, 2 PCI-E x16, 2 DDR DIMM, 2 DDR2 DIMM, Audio, Gigabit LAN, IEEE-1394)
Motherboard Chipset Intel Grantsdale i915P
System Memory 512 MB
Video Adapter SAPPHIRE RADEON X300SE - Secondary (128 MB)

I mainly just use this comp for browsing/gaming, so another 512-1gig of ram should be enough i think.
What i wanted to ask is what type of ram will be compatible with my system and how i would go about installing the ram when it arrives. Thanks.

 

[The Brick]

Depends on what sort of ram you have right now (ddr1 or ddr2), because it seems your motherboard supports both, but I seriously doubt that you can have DDR1 and DDR2 at the same time.

 

[Fliko]

Yeah, we need to know the exact RAM model you have (Having same RAM model reduces problems)

 

[myth]

its always recommended to go for the same kinda ram u r using right now (preferably same manufacturer)

 

[xLostx]

pop the side off your pc's case, look at the sticker on the RAM and write down what speed and shit it is, PC3200 333mhz and what not