No. of Recommendations: 1
I only use about half of my 4GB of RAM. Are the people who go to 8 or even 16 GB doing something really advanced (such as video editing or high end gaming) which requires that or, when it comes to RAM, is it "more is better" regardless?

If you use a 32-bit OS, then you literally can't use more than 4GB.

If you use a 64-bit OS, then a lot more memory can be accessed by the OS. You can run multiple virtual drives/programs in memory, for example.

Pricewise, it makes sense to buy two 4GB sticks (under $30-$40) or two 8GB sticks ($55-$75). That leaves room to add two more sticks later (when prices drop) if you can use them. The reason systems come with a total of 4GB or 8GB of memory is to permit them to charge customers stupidly high prices to "upgrade" the low-capacity memory and thus make a fatter profit.
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