Windows 7: Do I HAVE to use 1GB RAM sticks?

Hi, I have recently decided to buy some more RAM for my PC except I have one question. Firstly, here are my specs:

Memory Installed 1 GB
Maximum allowed 4 GB* (4 x 1 GB)

*Actual available memory may be less
Speed supported PC2-4200 MB/sec
Type 240 pin, DDR2 SDRAM

Board: Asus A8M2N-LA
Processor: MD Athlon 64 X2 Dual Core (3800+ 2.0 GHz)
and I have 4 DDR2 RAM slots.

Question is, if it indicates (4 x 1 GB) and the maximum allowed is 4GB does that mean I can only use 1GB sticks in the slots? Or can I use 2GB as well? (as long as I keep it at 4GB)

It would help knowing the exact model of your board to give a more precise answer.

But off the top of my head, you should be fine using (2x2GB)

You can use the online Curcial Ram Scanner to look at you purchasing options. Usually, the more Ram you have installed...the better. But, 1 more GB sould do it.
http://www.crucial.com/?gclid=CIyx5-...120419170513:s

Oh sorry, its an Asus A8M2N-LA

Use this System Information Tool to identify your hardware components.
http://www.piriform.com/speccy

I just looked over the specs for your Mobo, looks like a good main board.

Turns out I can only use a maximum of 1GB per slot. (I used the scanner). Thanks!

You already found the answer, but when it says 4x1 GB for the max...that means you only get a max of 1 GB per slot.

As far as adding memory, I would try to match your existing stick, or completely replace it with 4 matching sticks.

Let us know IF you require futher assistance.