DDR2 has 200 pins (the gold bits that you insert into the slot on your motherboard), and operates in the 1.8V range at frequencies of up to ~500MHz, whereas DDR1 (what you have in your machine) has 184 pins, operates at 2.5V at speeds of 200MHz.

DDR SDRAM = Double Data Synchronous Dynamic RAM

DDR2 = Double Data Rate 2. It's an evolutionary design change to the DDR standard.

The most important thing to remember is that DDR2 is not compatible with your machine.

I've never used the Kingston scanner, so I don't know how it gets the information it gives you. What I would suggest is this:

• Download CPU-z
• Double click on the executable (obviously, scan it with Anti-Virus software first).
• Wait a few seconds, and a dialog box will pop-up displaying all kinds of information on your processor and memory - it will give you not only information about what your RAM says it is capable of, but what it is actually doing as well.
• take screenshots of the tabs*, post them up here, and someone will be able to tell you definitively what RAM you should buy - PC3200 (DDR400) is what you want if your system bus is actually able to run at 200MHz. However, if your system bus is running at 166MHz, your RAM will be performing at PC2700, not PC3200.

*To post a screenshot, follow these instructions:

1. Hit alt+Print Screen with CPUz as the active window.
2. Open up MS Paint
3. Hit CTRL+V to paste the screenshot into the Paint window.
4. File > Save As JPG.

After that, you have two options:

• Go to Imageshack.us or pix.nofrag.com and follow the instructions there to upload the image to their server, then paste the url of the image into [img][/img] tags.

Alternatively,

• you might be able to host the images on itsallpc by attaching files through the "Manage Attachments" dialog below the text entry box.