your RAM is not bottlenecking you at all. Your CPU max FSB matches the Memory's so unless your overclocking the FSB its fine.. 4gigs as of now is fine for pretty much every game out there, you can go for more memory if you want too but it would not be as effective as investing it into a better video card or something like that. 6-8 gigs just isnt necessary
When you run L4D enable Multi-Core support to take full advatage of the CPU. isnt much you can do after that i dont think.
When you run L4D enable Multi-Core support to take full advatage of the CPU. isnt much you can do after that i dont think.