The HP Compaq DX2450 desktop computer uses DDR2 Sdram at either 667 Megahertz, or 800MHz.
This is PC2-5300 and PC2-6400, respectively.
1) The Maximum Total Amount is 4GigaBytes. (4GB)
2) The Maximum Amount for EACH ram memory slot is 2GB.
3) There are FOUR ram memory slots. You can install 1GB in all four, or 2GB in two of the Ram Memory slots.
IF, you only have one ram memory module, ('Stick'), it MUST go into ram memory Slot 1.
The ram memory slot that is closest to the Processor.
On the motherboard you may see > DIMM 1 next to ram memory Slot 1.
Advise do Not obtain high performance ram memory for this computer. The voltage needed may be higher than the factory default setting, for the ram memory. (Factory default voltage setting is 1.8 Volts)
Also the ram timings of high performance ram memory may not work.
Just stock ram memory will work just fine, and boost the performance of your DX2450 computer.
To open the computer case, read the specifications of ram memory that is supported, and how to remove, and install ram memory, I would like you to download the Hardware Reference Guide from HP Support,http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64180&taskId=101&prodTypeId=12454&prodSeriesId=3658382
On this page under the heading > Quick jump to manuals by category, I would like you to click on > Hardware reference
Under the Title heading i would like you to click on >
Hardware Reference Guide - dx2450 Microtower Model
This is a PDF file. The computer you are on now has Adobe Reader on it, which uses PDF files.
After you click on the file name, you may not see anything happening for up to 30 seconds.
The file is downloading in the background.
After you see the first page, it may take additional time for the file to fully download. Suggest you let the file fully download before looking through it.
If you are familiar with PDF files please disregard the following;
The page number box is at the top of the PDF file. It is to the right of the Blue Down Arrow.
There are three ways to get to a specific page.
One ,use the blue down arrow until you arrive at the page you want.
Two, click on the Bookmarks icon to the left, and use the Bookmarks menu.
Three, place your mouse cursor in the page number box, left-click once.
Type the page number
Press the Enter key.
Page 9 details how to open the computer case.
Page 14 details how to remove, and install ram memory.
If you cannot download the Hardware Reference Guide, please state so in a Comment, and I'll step by step you through opening the computer case cover, and removing/installing ram memory.
As for pricing of the ram memory you need, I can give you a link to a website that does shows you choices, and prices.
This is just one website. There are MANY. I am not advertising for them.http://www.crucial.com/store/listparts.aspx?model=dx2450
I can also give a few examples from another website. Again, not advertising fro them,
1GB at 800Mhz. Or also stated as PC6400, and PC2-6400
2GB at 800MHz. (PC6400, or PC2-6400. The 2 is added to PC2 by some ram memory manufacturers to state that it is DDR2 (Sdram)
2 Times 2GB sticks. Total of 4GB.
What to choose?
Depends on one's budget really.
How much one can afford in order to boost performance.
I can tell you that more than 2GB isn't really needed, unless you are an all and out gamer, and MHO is it's overrated.
Tips and info from me:
I'm going to show you a ram memory module (Stick) that is DDR Sdram.
This is to only detail certain aspects of a ram memory module.
A DDR Sdram ram memory module has 184 gold plated contact pins on the bottom.
92 on each side.
A DDR2 Sdram ram memory module has 240 gold plated contact pins.
120 on each side.http://en.wikipedia.org/wiki/File:Generic_DDR_Memory_%28Xytram%29.jpg
(You can click on the photo to enlarge. You can enlarge twice)
Observe the Locating Notch on the bottom. The cutout.
From a casual observation it may look to be centered. It is Not.
The bottom of a ram memory slot has a Locating Lug.
The Locating Notch must line up with the Locating Lug.
Observe the Notch on each side of the ram memory module.
At the ends of the ram memory slot are Locks. They sort of resemble 'Ears'.
The top of the Lock is brought out to the outside.
The lock is hinged in the middle.
Works on the same principle as a See-Saw on a playground.
The bottom inside corner of each Lock has a slot in it.
The bottom outside corners of the ram memory module sit down in these slots.
As the top of the Locks are brought to the outside, they lift up on the ram memory module.
As the ram memory module is installed, the top of the Locks come to the inside.
Each Lock has protrusion, or "Bump' on it. The Bump fits into the Side Notch on the ram memory module.
When the ram memory module is fully seated into position down into the ram memory slot, the Locks snap into the Side Notches.
You should hear a satisfying Click, click as they do.
This means you have the ram memory module seated.
I lay the computer on it's side, opening up. Much easier to access the ram memory slots.
You may have to unhook a couple of cables to be able to egress the ram memory slots.
Make notes, and marks on them as to the proper positioning, BEFORE you unhook that cable's connector.
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the hardware components inside a computer.
It can also short out the Ram Memory module/s before you install them, after you take it/them out of their protective anti-static bags, or cartons.
Computer on a table, computer unplugged from power, computer case open.
TOUCH an unpainted surface of the metal frame.
This will relieve Static from your body.
Now you can reach inside your computer, and remove the ram memory module/s from their protective apparel.
Should you leave your computer in the middle of working on it, upon your return be SURE to touch the metal frame again.
Have questions please post in a Comment.
Would appreciate hearing how this came out.