Hi, I have an HP Pavillion Media Center PC. The specs are: 3072 RAM - 640 GB Hard Drive _AMD9500 Quad Core Processor. OS is Vista Home Premium SP1. I want to install more memory and really dont know anything about it. I have heard you should install double memory of equal size. In the case of a Quad core processor would that mean 4? Also would installing more RAM improve the speed of my computer? Any recommendations on size and brand to install? Thankyou very much.I don't see the processor spec/speed as determining your RAM quantity choice per se. 3 Gb is pretty useful but certainly it is generally reckoned to match one stick with another but you don't say whether your 3 Gb is one stick or not.

I am imagining you have two RAM stations and so it'd be preferable to have 2 x 2Gb or 2x any other size. Some older machines seem to ''see'' unequal sticks but better to have matched pair.

Kingston is a reputable make and you can find prices etc from places like techforless.com and newegg.com. Up to a point more RAM is invariably better - providing a system is not bottle-necked making access slow ... your machine should be good I'd think.

Don't forget that with Vista - you can utilize a fast USB memory stick as extra RAM ... as long as Vista sees it as fast enough. You might consider adding a 4Gb to a USB port as another OPTION.Thankyou very much Chris!The AMOUNT of RAM, you have is basically all, that can be used by 32-bit system. In theory, it may handle 4GB, but in reality, it can use only little bit over 3GB, so you're perfectly fine.
What are your exact issues?

Chris
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You might consider adding a 4Gb to a USB port as another option.