Thanks to the "gumstick" M.2 format, SSDs have been shrinking—and getting a lot faster, too. Here's how to buy the right M.2 SSD, along with deep-dive reviews of today's top models. I have been ...

Is it a black opal, white opal, crystal opal, etc.? Determine the ratio and quality of its play-of-color: Consider the percentage of play-of-color compared to background color, its intensity, dominant ...