Full Review - Page 5
Upgradeability While the system hardware present in the 610XL is some of the best currently available, how will the system fair in a year or two? Sadly, the only hardware we found that could be upgraded in the system is the memory. Simply unscrew a plate on the back of the system and you will have easy access to the memory. We would recommend that if you can afford it, you go with the most powerful configuration of the 610XL available. This means upgraded memory and any other internal components which Gateway gives as an option to upgrade at the time of purchase. Now while we are disappointed to see the limited upgradeability, the upside is that the 610XL is more powerful than any other system we could find in this category, so it is likely to be up-to-date longer. 
The memory can be upgraded by accessing the rear panel
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by James on March 3, 2008:
“I purchased my unit when they first came out and got an extended warranty. When the warranty ran out so did my power supply. Without others in the same boat it would still be collecting dust. Gateway support doesn't. All they want is for you to send it in...” More...