Another year, another iMac refresh. For what? A pitiful processor bump? An even thinner display on a device that you'll never see from the side? Not this time. Today, Apple brings the high-density Retina display to its largest form factor yet: the 27" iMac. With such an enticement for consumers to upgrade, we took extra care to find out what changes Apple made under the iMac’s hood. What new hardware supports this behemoth of a display? And what do the new changes mean for repairs and upgrades? After our step-by-step comparison, we compiled a lengthy list of the repair-relevant changes:
Given its industrious reuse of an old design, the iMac Intel 27" Retina 5K Display earned the exact same 5/10 Repairability Score as its predecessor. And for the exact same reasons: user-replaceable RAM, hard drive, and CPU are all positives, but a fused LCD and taped-down display glass hinder the would-be repairer.
• Fixers rejoice! The iMac Intel 27" Retina 5K Display retains the familiar, easily accessible RAM upgrade slot from iMacs of yore.
• While the opening procedure still requires a steady hand and a willingness to replace the custom-cut, two-sided adhesive tape when you're done, it's otherwise pretty straightforward, and unchanged from previous models.
ICs in the Retina 5K display:
• Texas Instruments NH245 8-Bit Dual-Supply Bus Transceiver • Texas Instruments BUF16821 Programmable Gamma-Voltage Generator and Vcom Calibrator • Parade Technologies DP665 LCD Timing Controller • Texas Instruments TPS65270 Monolithic Dual Synchronous Buck Regulator • Texas Instruments TPS65168 High Resolution Fully Programmable LCD Bias IC for TV And elsewhere:
• Intel Core i5-4690 Processor • AMD Radeon R9 M290X GPU • SK Hynix H5GC2H24BFR 256 MB GDDR5 SGRAM (8 x 256 MB = 2 GB total) • Intel NB430029A00200 Platform Controller Hub • Broadcom BCM5776 Gigabit Ethernet Controller • Cirrus Logic 4206BCNZ Audio Controller • Intel DSL5520 Thunderbolt 2 Controller • Microchip Technology 1428-7 420BE5A BMY System Management Bus Temperature Sensor • Intersil ISL6327 Enhanced 6-Phase PWM Controller • SanDisk 05131 016G 16 GB NAND Flash (8 x 16 GB = 128 GB total) • SK Hynix H5TQ2G63DFR 2 GB DDR3 SDRAM • Marvell 88SS91383 PCIe SSD Controller • Broadcom BCM4360KML1G 5G WiFi 3-Stream 802.11ac Gigabit Transceiver • Skyworks SE5516 Dual-Band 802.11a/b/g/n/ac WLAN Front-End Module • Broadcom BCM20702 Single-Chip Bluetooth 4.0 HCI Solution with Bluetooth Low Energy