When is it OK to buy memory cards online?

Ars Technic’s Sam Altman is here to answer the questions that the world’s most prominent computer enthusiasts have been asking about buying and using RAM in the last few years.

Sam Altman/CNETSam Altmayer/CNBCIn this series of articles, Sam covers topics from memory cards, to PC upgrades, to storage upgrades, and even a possible upgrade to RAM.

If you’re thinking about buying or using RAM, we’d like to know what to expect.