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Do you know how computer ram memory upgrades work?
I want to upgrade or add memory to my computer to help with the ease of operation. My computer says it was built with three slots of memory at 256mb. It has two chip sets installed right now equaling 512b of ram. When I log into gateway's website, obviously now you know it's a gateway running windows xp home, and enter the serial number for information on my system, it says that the maximum amount of ram that can be installed is 1536mb sdram, pc133. It also says that the memory I need is 256mb pc133 hd sdram. If there are already two of these installed at 256mb each equaling 512mb, how do I achieve a higher memory of say 1000 mb? Is it even possible? Would that mean I would have to remove the two 256mb memories and install 3 512's? Will that work? By the way, I am considering this memory upgrade in an attempt to eliminate a computer problem I am having where my pc freezes up randomly. see my other questions posted on here in my profile.
We need to know the model # to be more specific
Also, what OS is important to know. And what problem you're trying to solve and why you think RAM is the solution. You could be wasting your $$ on that computer.
And which OS (I know I said that already) since, after adding RAM, you usually want to increase swap space to "match" (don't ask me, I didn't develop the OSes, I just follow the recommendations which actually work).
Often, you get to eBay the RAM you have when you upgrade. This is usually because it's cheaper for the mfgr to use more, smaller RAM chips to meet the shipping objective (512 in your case) than the smaller # of larger chips.
Bad for the consumer who wants to upgrade, but good for the initial selling price of the machine.
Something in your question is not accurate.
Either it has only 3 slots, or each slot takes 256MB max, or the max memory is not 1536. One of these statements is inaccurate.
It's possible all three slots can take a 512MB stick. *** this is the most likely given the information you have provided. This doesn't mean it's an accurate solution.
Perhaps your machine has 4 RAM slots (I'm guessing), and that you would add two more 512MB sticks to the open slots to take you to the # required.
Or the 3rd RAM slot will take 1GB (1024MB + existing 512MB = 1536MB, or 1.5GB).
Or it has 8 slots...
For more detail on why this isn't straightforward to answer, read the below. Prepare to be a bit more confused. 
In many cases, RAM cannot be added to a single RAM slot, so you may not be able to add three 512MB sticks of RAM.
Some computers limit how much a addressable, for instance, in the middle of last year, I worked on a Lenovo (nee IBM) that allowed you to install 4GB, but it would only address slightly over 3GB, thereby wasting the rest of the RAM that was installed (the explanation is technical, and while accurate, does still smack of misinformation since we bought the machines to address 4GB, not just be able to install 4GB).
Some computers want 2 chips at a time (each slot being 16 bits of addressable space, with the requirement being the ability to address 32 bits). Other computers have each slot addressable as 32 bits. Older ones were 8 bit each, requiring 4 sticks of RAM at a time.
Some computers can take RAM 1 slot at a time (each being 32 bits). THis would explain how you can have 3 slots.
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