I suggest you go online with this computer to Crucial.com, and use their Crucial System Scanner Tool. (On homepage just click on the 'Scan My System' button) This tool doesn't download anything to your computer, there's no viruses, spyware, etc., and it's FREE! It only looks at your computer hardware, and not your personal stuff, plus you aren't obligated to buy from them. It's just a 'Soft Sales' technique, in the hopes you will buy ram memory from them.
It will tell you:
1.How much is the MAXIMUM Total amount for the computer. (No, I'm not shouting! lol!)
2.How much is the MAXIMUM amount for each ram slot. (Correct 'Computer Speak' for Slot, is Bank.)
3.What type of ram it is. (Examples: DDR Sdram, DDR2 Sdram)
4.What frequency speed the ram operates at. (Examples: 333MHz, 400MHz, 533MHz, 667MHz, 800MHz. MHz stands for MegaHertz. Approximately 1 million cycles per second, is 1MHz.)
Manufacturers, a long time ago, came out with a more simplified way of naming ram memory. Examples: PC2700, is DDR Sdram that operates at 333MHz. Another example. PC6400 is DDR2 Sdram that operates at 800MHz.
How does ram memory increase speed up a computer? Crude example. You are doing a thesis for college. You have so much information stored in your brain, itself. (The processor is the 'Brain' of the computer.) When you need more information, you have it stored in the form of books. (Ram memory) Takes time to crack open a book, look to the page/s you need for your required info. What if all you had to do was click a couple of keys on your keyboard, for your computer?
Get your info off of the 'net at lightning speed? This would be a ram memory increase. (However! Ram memory is a volatile memory area.
When you turn your computer off, all the stored information on ram is gone! So ram can't really be compared to a book.)
Edit: While I appreciate the above info from the answerer above, I feel it is erroneous. Crucial.com will give you the exact ram memory that you need, as will Tigerdirect.com, and Newegg.com. The computer manufacturers buy their ram from the same source, as the above listed computer parts dealers I have listed. My source? I build custom gamer computers, repair computers, and have answered questions here for over two years. With an Internet Provider change, I have had to start all over. (I had 25,588 points, and was Level 7, lol! I re-opened the old account, and reached Level 7.)
The only time one needs to worry whether, or not ram is going to work is when SDR Sdram is concerned. Double-Data Rate Sdram, is pretty forgiving. Double-Data Rate 2 Sdram, is pretty forgiving. As long as it's the correct type,(DDR Sdram, or DDR2 Sdram), and is the correct speed,(333MHz, 400MHz, 800MHz, etc.), it will work. High-performance gamer ram memory is a different story, but we're not 'talking' about high-performance gamer ram. There's no reason to 'bump' up the voltage on the motherboard, or increase the ram timings.
Single Data Rate Sdram doesn't 'play' this way. Why? Because ram manufacturers, back when this ram was brought out, didn't all follow the 'same page'! There was no set standard for voltage, ram timings, chip configuration, and no SPD,(Serial Presence Detect). JEDEC organization came out, and set standards. DDR Sdram uses 2.5 volts. DDR2 Sdram uses 1.8 volts, and so on.
(SDR Sdram is commonly know simply as SDRAM. This is a misnomer as all ram memory from SDR to DDR3 IS Sdram!
Synchronous Dynamic Random Access Memory.
DDR is Double Data Rate Sdram. DDR2 is Double Data Rate 2 Sdram. DDR3 is Double Data Rate 3 Sdram.
1.http://en.wikipedia.org/wiki/SDRAM
2.http://en.wikipedia.org/wiki/RAM
3.http://en.wikipedia.org/wiki/DDR_SDRAM
4.http://en.wikipedia.org/wiki/DDR2_SDRAM
5.http://en.wikipedia.org/wiki/Serial_Presence_Detect
6.http://en.wikipedia.org/wiki/CAS_latency
7.http://computer.howstuffworks.com/computer-ram-memory-channel.htm
8.http://www.hardwaresecrets.com/page/memory
Edit 2: DDR2 Sdram? Gateway computer? Okay! Now we're getting somewhere! What is the model number? I can look the computer up, and see what frequency speed the ram memory operates at.
Secondly, I forgot to add about Dual Channel memory. To have your ram memory in a dual channel configuration, these following things need to be observed.
1.The ram 'sticks' must be ALIKE. For example. If you want 1GB of ram in a dual channel configuration, you must have two 512MB sticks that are ALIKE. Same speed, same chip configuration, same voltage, same SPD. That's why when buying ram for this application, it is best to buy them from the same manufacturer. This is why when you look for dual channel ram memory, you'll see two sticks listed.
2.Your motherboard must be capable of supporting a dual channel ram configuration. The ram slots you see on your motherboard? A general rule of thumb, is that if two slots out of four are the same color, this mobo supports dual channel ram. This is just a rule of thumb, and is not very technical at all. To truly find out, one consults the Motherboard Manual, for the motherboard in the computer. (Or a quick search for reviews on the motherboard will result in some concrete evidence!)
3.When ram is installed in Dual Channel configuration, the ram sticks 'piggyback' off of each other.
4.Now having said all the above, it's time for a reality check.
Tomshardware.com, has done extensive testing, and has found that installing ram in a dual channel configuration, merely 'bumps' up performance of the ram by 1 to 2%!
Whoopee! 1 to 2%!