Lets talk about wanting to do some PC upgrades. There are many things you can do to upgrade you PC. One of the most basic is upgrading your RAM. A lot of PCs now a days run slow cause they do not have the RAM that is needed to run a lot of programs at one time. If you are not really running a lot of games and just doing office work and suffering the web 4 Gigs of RAM is a good thing to have. It will also help with Windows or whatever OS you are running out a lot.
For a lot of the games people are running now a days I think they having 8 Gigs of RAM is pretty ideal. Your Windows OS can come into play on this. If you are running any of the Windows 7 x86 you are limited to only being able to use 4 Gigs of RAM, and if you are using Windows 7 starter for x86 you can only use 2 gigs. If you are using windows x64 you have a few more options about how much RAM you can use. Windows 7 Home Basic you can use up to 8 Gigs of RAM.Windows 7 Home Premium you can use up to 16 Gigs of RAM. Windows 7 Professional,Windows 7 Enterprise and Windows 7 Ultimate you can use up to 192 Gigs of RAM in your PC.
When you start to look for RAM for your upgrade you need to make sure that it is compatible with your Motherboard. Nothing worse then ordering the wrong stuff just to find out that it will not work. This goes for ordering any upgrade parts, always make sure they are going to work with your existing hardware. RAM is pretty much as easy as it comes to replace and why I think its one of the most basic parts to upgrade.
Another part that is easy to upgrade is your Video Card. For the most part, you can just take it out of its slot and put the new one in. Again you want to make sure that you get one that is compatible with your Motherboard. Now a days Video cards come in all sizes. Most people doing office work or surfing the webs and even just watching blurays can get away with just one that is about 1 gig of Vram. If you are a gamer or the sorts you might want to get something a little better, and you can find Video cards that go up to 2-4 gigs or more.