Just received my new TX790 (I currently have a TR2AP, which was the last notebook I bought).  One of the available accessories, which I purchased, is a 512MB Expansion Memory Module (VGP-MM512L).  A few questions:

1. Looking through this forum, I am learning that I could have purchased a much more economical memory upgrade at places like crucial.com and newegg.  Why is the Sony version so expensive ($299)?  Is there an advantage to using their proprietary hardware?

2. Do I even need this?  When I open the memory access panel in the back, I see just one slot, and it’s already filled with the 1GB module that came with the unit.  You can probably tell I’m no expert, but I’m thinking I don’t want to replace that with a 512MB module.  What am I missing?  If the only module you can replace is 1GB, why would Sony list a 512MB module as an accessory?

3. I’m thinking I should just return the module, but if some of you recommend extra memory, what should I get and where do I install it?

Thanks for your help!

Here are my answers:
1. It’s expensive because it is named Sony.
2. What’s total RAM you already have in your TX790? If it’s 1GB, your TX790 probably has one slot and filled with 512MB and 512MB onboard. If module in slot is 1GB and then you have maximum 1.5GB. Sony list 512MB as accessories sue to there are some models have only 512MB and for people who want to upgrade to 1GB. Your model comes 1.5GB factory installed and it is maximum.
3. Return extra module is best for saving your money. You have max and you dont need to upgrade.

That’s pretty much what I thought.

Thanks for the advice.