The iMac “Core i7” 4.0 27-Inch Aluminum (Late 2014/Retina 5K)
technically is a “configure-to-order” configuration of the iMac “Core i5” 3.5 27-Inch Aluminum (Late 2014/Retina 5K),
but also is documented as a separate model for reader convenience. Other than processor (and the corresponding level 3 cache), these two models are identical.
The iMac “Core i7” 4.0 27-Inch Aluminum (Late 2014/Retina 5K) features a 22 nm “Haswell” Quad Core4.0 GHz Intel “Core i7” (4790K) processor with four independent processor cores on a single chip, an 8 MB shared level 3 cache, 8 GB of 1600 MHz DDR3 SDRAM (PC3-12800) installed in pairs (two 4 GB modules), a 1 TB “Fusion Drive” (1 TB hard drive and 128 GB SSD), and a AMD Radeon R9 M290X graphics processor with 2 GB of dedicated GDDR5 memory. It also has a built-in “FaceTime HD” webcam and stereo speakers, but lacks an optical drive.
This model has a 27″ 5120×2880 LED-backlit 16:9 widescreen IPS display that Apple has dubbed “Retina 5K”. The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.
Connectivity includes four USB 3.0 ports, dual Thunderbolt 2 ports, Gigabit Ethernet, 802.11ac Wi-Fi (802.11a/b/g/n backwards compatible), and Bluetooth 4.0.
Compared to the Late 2013 models introduced previously, this model essentially has the same external enclosure, but it has a much higher resolution display as well as a modestly faster processor, a higher performance graphics processor, a “Fusion Drive” by default, and Thunderbolt 2 support.