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This may be a stupid question, but why is Apple putting in a high-color-gamut display in while still limiting OS X to 8 bits per component?

In case anyone is wondering: the answer is they aren't. OS X 10.11.1 quietly added support for 10-bit color (ARGB2101010 instead of ARGB8888, leaving the question how Quartz handles Alpha in this case), and the Retina iMacs support it.
 
I bought my 2012 Mac Mini with 4 Gig of RAM, and when I could afford it; bumped it to 16 Gig (my only error was getting 1333 MHz instead of 1400).
I bumped mine to 1600 MHz memory modules, you mean you got an even slower modules?
 



Earlier today, iFixit conducted a teardown the new Magic Keyboard, Magic Trackpad 2 and Magic Mouse 2. They've now followed that up with a teardown of the brand new 21.5-inch 4K iMac, and while the majority of the insides are the same as last year's model, there are some notable differences.

new4kimacteardown.jpg
First, the teardown found that the new iMac's 4K display is manufactured by LG. The new display is DCI-P3, which features a wider color gamut than the more standard sRGB. The new iMac is one of the few devices that allows consumers to experience the new display technology.

Apple has also removed the empty PCIe SSD slot that was featured in the late 2013 iMac, which means that do-it-yourself upgraders won't be able to upgrade their machine easily. In 2012, Apple featured empty solder pads where the SSD slot would go, but in 2013 added an empty SSD slot. iFixit notes that users who want to add a Fusion Drive will either have to configure it at purchase or solder it on themselves.

Overall, iFixit gave the new 21.5-inch iMac a repairability score of 1 out of 10, which means that the new desktop computer is extremely difficult to repair. Like other iMacs, the soldered-on CPU, logic board and fused-together glass and Retina Display contribute to how difficult the new desktop is to repair.

Article Link: iFixit Teardown of New 21.5-Inch 4K iMac Reveals DCI-P3 Display, Empty Solder Pads

All well and good but iFixit must do an Apple tear down.
 
Uh, no. You'd buy the iMac with a platter (spinning) hard drive and theoretically solder in the PCIe flash drive. If you were so inclined. The reality is that almost nobody is ever going to do that. Like the soldered memory, this just makes people buy the faster storage at the time they buy the iMac.

Philosophically, no different that the 16GB iPhones and iPads.

Or you could get an external USB 3.0 SSD case install your own SSD and plug it in.
 
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