Need to buy more RAM for my computer

The type of RAM you need depends on the motherboard you have, which I cant seem to find. Do you know what mobo you have?

Edit: Also, a good site to buy components would be www.newegg.com

crucial has a free tool to scan for memory, i use it then buy the ram elsewhere
http://www.crucial.com/

Been looking for you, if its a p6507 c then 4gb is the max
http://www.crucial.com/store/listparts.aspx?model=Pavilion%20p6507c&Cat=SSD

4GB is good for gaming, it's most likely your processor that's holding you back.

i would say hold off until DDR4 RAM comes out and DDR3 or DDR2 depending on which one your computer uses becomes cheaper, but i believe that the problem is more than likely your CPU

You need to provide motherboard model and your previous RAMs model.

http://www.crucial.com/systemscanner/

Run it.

The HP Pavillion p6507, if I found the right specs, was sold for about 600 USD. The parts within, minus the OS and the peripherals, were worth maybe 250-300 USD at time of purchase. An outdated Athlon II dual core, onboard GPU, outdated RAM, and outdated motherboard. And this is assuming that I found the right specs. They made earlier models of the p6507 with weaker parts.

Your motherboard uses DDR2 RAM. While it is not too slow for gaming today, DDR2 modules are not manufactured anymore at the consumer level. DDR2 RAM is now far more expensive than DDR3 RAM, which is the standard of today.

You cannot replace your particular RAM without replacing your motherboard, and that will also require a new CPU since AMD keeps the RAM controller on the CPU die rather than the motherboard like Intel. And considering it was a budget system when you bought it, you'll probably want to improve the power supply so you can handle the quad-core processors which are the baseline normal today. You'll need a new motherboard, a new CPU, and new RAM.

Here's some parts I'd go with to get you started. I went with a MicroATX motherboard because I'm not sure how much space is in your current case. Your current video card will do fine. Your hard drive will do fine as well, assuming it's still in good working order.

Motherboard 55 USD

CPU 110 USD (might need a CPU cooler, not sure if this includes one. 'Good enough' coolers are cheap.)

RAM 65 USD

Power Supply 60 USD

Total upgrade cost = 275-300 USD. Waiting for a sale or looking for a bundle or rebate can save you some money. Shopping carefully, you may be able to pull this off for as low as 200, but I'd expect closer to 250.

You should be able to use your current OS, assuming that you have the installation serial. Windows 7 will notice that your system is very different from what it used to be, and have issues. You can fix this by locating your installation serial and installing Windows 7 freshly onto the hard drive after formatting. Just download the install DVD from Microsoft directly, burn it to a blank DVD, and do the install thing. Plus, doing a clean install will ditch all of the bloat that prebuid PC vendors put onto the system.

Your video card can be brought over to the new system. Your hard drive and DVD-RW can, too. You can also reuse your current case.

The parts I picked will either last you many years, or they provide upgrade room for when you actually need to upgrade. These parts aren't going to be obsolete two years before you buy them, which is what prebuild vendors like HP provide you with in that Pavillion.

Disclaimer: This is my last post of the day. I may be too tired to see a mistake or an oversight.

Go here and everything will be good.

You don't need more RAM, you need a new CPU...