RAM is only going to make a minor improvement in performance. RAM itself does NOT improve performance, but just lets you store more data so you can run more programs, or run more heavy programs. If your RAM gets filled, the OS starts using your hard drive for virtual memory, which is MUCH slower.
But, with that being said, the large majority of what bogs a video game down is the graphics. The rest of the code, including the audio and the game logic, etc., will easily fit into 2GB of RAM on a well optimized system.
Any time you can offload CPU cycles to a DEDICATED video processor, it's better. Period. A new video card is going to severely outperform more RAM on your system. And when it comes to video games, more VIDEO RAM is preferred to more SYSTEM RAM. Video RAM is preferred because it doesn't have to share resources with the system. You can FULLY utilize video RAM where as with system RAM, you are still working with shared space.
Not that you shouldn't get RAM, as 2GB really isn't much these days. But it's not going to make as much of a difference as a new GPU. And what might be most important is if you don't have a 64-bit OS, more RAM is going to make even less of a difference. Getting higher amounts of RAM on your video card will essentially add more available RAM for your games without having to deal with the 32-bit limitations.
Get the video card. RAM is cheap, get it later. Seriously, get the video card.
Brent
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