Dell sales will not configure the xps 600 with 4 GB of memory. As you said the max is 2. If you ask the sales person, they will tell you to add it yourself, and that they don't know why you can't build it with 4. I suspect that they will eventually change it. I purchased mine with 2 and I bought 2 more from Dell. Some will tell you to buy from New Egg etc. and I am sure they are right, but I liked the idea of putting in what Dell put in. I know that my system is using the 4.

besides it's cheaper to order additional RAM through other channels than Dell.
I read somewhere here on the forum that the XPS600 can address only 2GB memory or 8GB when 64verision of WinXP is installed... Make sure you don't waste your money on RAM your system won't recognize and utilize.

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@Tom McCune wrote:

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@T3raYon wrote:
besides it's cheaper to order additional RAM through other channels than Dell.

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I wouldn't just make that assumption without checking. When I added RAM to my XPS 400, 2GB at 667mhz via Dell, was less expensive than buying 2GB of 553 at Crucial.

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Well I don't know the details of your purchase but when I made my RAM upgrade for my XPS Get 4 a year ago the Dell price was 70% over with what I managed to get.
What is important in the comparison:
Use the same brand as Dell offers, use the same type in every aspect of the memory chip. Dell typically recommends and sells Kingston RAM when upgrading, but for the configurations they ship they put completely different (and cheaper) ones. One of my config came with Samsung another with Infeon (this is like low end low cost manufacturer). When I upgraded the Samsung I managed to get the additional RAM very similar to the original (within the 16 digit product code that describes the RAM IC module I only had 2 digits different --> the manufacturing batch version number for the chip...)

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@T3raYon wrote:
besides it's cheaper to order additional RAM through other channels than Dell.

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I wouldn't just make that assumption without checking. When I added RAM to my XPS 400, 2GB at 667mhz via Dell, was less expensive than buying 2GB of 553 at Crucial.

I may have just been lucky with my timing.

I purchased my machine with 1GB RAM. Doing the upgrade to 3GB with my additional Dell purchase of 2GB, wound up costing me only $20 more than if I had purchased the machine with 2GB.

KarthikAdla,

This statement,
"If you are ordering the regular Windows Xp operating system , YOU can install only up to 2GB of RAM.",

should be changed to,
"If you are ordering the regular Windows Xp operating system , DELL can install only up to 2GB of RAM.".

Dell will provide an XPS 600 loaded with the 32bit Windows XP with 2GB of ram.

If you decide to add another 2GB of ram, we cannot validate how much of the 4GB windows will "see".