Adding mismatched RAM on MacBook Pro ?

Hi,
I have a 2.0 Ghz MacBook Pro with the 512 MB Stock RAM that it came with.
I would like to add 1 Gig of Mac Compatible Corsair or other branded RAM.
Do I have to install matched RAM in this computer ?
Does it matter if the RAM I buy matches the brand of RAM already installed or if it is the same amount ? I am honestly really confused about this.
Ram prices are really low in Canada right now so I want to take advantage of this but at the same time, want to make sure that the $84.00 CDN that I am planning to spend on this extra 1 Gig will make a siginficant or at least noticable difference in my MBP performance.
Thank you for any recommendations or suggestions you may have.
Kallum

KMoorehouse,
First, I'll tell you that all of the Macbook Pros use the same memory: 667MHz DDR2 SODIMMs. And, had I not noticed that you are in Canada, I would have recommended RAM from the same place tat the other poster did. In fact, I will provide two links:
For a 1 GB module
For a 2 GB "kit" (2 X 1 GB)
I purchase all of my RAM from this company, and I have been doing so for several years. I have never had a RAM-related problem, and they provide very good service.
I realize that there may be difficulties for you, being in Canada, and I do not know what those difficulties might be. If you can order from them with no problems, it might be worth it. Give them a call to find out what the ramifications would be ordering from Canada.
Going to 1.5 GBs will provide a world of difference for your MBP, if that is all you can afford. 512 MBs is simply not enough even for just OS X; add an application or two to the mix, and your MBP's performance will be really poor. Even going to 1 GB by adding a second 512 MB DIMM would provide significant benefits, and it would additionally enable Dual-Channel mode. I think that the additional benefit of having 1.5 GBs will be greater, however.
Scott

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