The standard amount of 4 GB is enough for most situations and adding more memory doesn’t bring any noticeable benefits. You can only get a positive effect from such an upgrade if you've got a very slow HDD in your system. The SuperFetch technology which uses system memory for look-ahead data caching may make your computer more responsive then. However, it would be wiser to spend the money to improve your disk subsystem and get much better results.You can read it over here.
Upgrading your PC: 8GB DDR3 or a SSD?
Posted on Sunday, November 07 2010 @ 7:27 CET by Thomas De Maesschalck
X-bit Labs researched whether you should spend money on extra RAM or a solid state disk once the CPU and graphics card of your PC perform up to your expectations. The site concludes installing a SSD is the best way to get more performance once your system has 4GB of RAM.