In a recent engadget article, Jon Fingas points out the following:
If you're planning to snag the new Mac mini and load it up with aftermarket memory, you may want to reconsider your strategy. Macminicolo owner Brian Stucki (among others) has discovered that the RAM in Apple's latest tiny desktop isn't upgradable, much as you'd expect with the company's laptops and the 21-inch iMac.
(Score: 0) by Anonymous Coward on Monday October 20 2014, @03:44PM
There's two types of soldered-in RAM. One is where they take a regular SO-DIMM, and solder that to the mainboard, which saves the cost of a socker, but little if any space, since you still have all the same layers in your sandwich. The other is to solder RAM chips directly to the mainboard -- which can actually save quite a bit of space, if it allows you to make the whole laptop thinner. (Obviously, no benefit if e.g. normal-height HDDs make the whole laptop thick enough for SO-DIMMs anyway, but for SSD-only machines it can matter.) Discussing the pros and cons of soldered-in RAM without mentioning which type you're talking about is pointless and stupid.