Model A1419 / EMC 2806 & EMC 2834/ Late 2014 or Early 2015 or late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 Processor / Retina 5K display

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iMac Late 2015 - Upgrade SSD or use Apple Stock SSD

When buying the 1TB SSD with the iMac directly from Apple: Is it a PCI-Express SSD then?

Is the main HDD-Slot empty in this case (hence could I add another HDD later on?)

Doing the upgrade via Apple is like 400$ more expensive than upgrading yourself. Is the PCI Express SSD worth it? (If this is what apple uses)

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Your system has two drive ports: a custom PCIe x4 for a blade SSD and a SATA III (6.0 Gb's) for a traditional 3.5" HD.

If you review the IFIXIT teardown here: iMac Intel 27" Retina 5K Display Teardown you can see whats what.

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Yeah okay, I see. So if I buy the 1TB SSD, only the blade slot is used and the other one is blank?

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Apple also sticks it to you on the RAM, so upgrade that yourself too.

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Yes, the SATA port for the HD would be available for a future drive. It could even be a 2'5" SATA based SSD!

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Do I need the thermal sensor ($37) for a Samsung SSD Sata that I'm gonna replace the HDD with on a late 2015 5k imac 27". I'm buying the bracket, adhesives with wheel cutter, do I need to buy OWC In-line Digital Thermal Sensor for iMac 2011 Hard Drive Upgrade??? I read that with sierra and el cap I wouldn't need the sensor. I wonder though, if I had to boot into windows (i have yet to need to, but may have work that will benefit from it), if the fan would go full blast.

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Nope, Apple didn't alter anything within the OS or firmware to forgo the sensor. I think you're getting caught up in an urban legend.

Yes, you still need the in-line sensor, here's the part you'll need: OWC In-line Digital Thermal Sensor for Hard Drive Upgrade for 27" iMacs 2012 and Later

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