IMac with Retina 5K display (mid 2015)
When Apple launched the first iMac with Retina display last October, it stood alone in terms of competition from the usual Windows suspects, since no PC maker had anything close in design and performance.
But it was also launched as a solitary model in the Apple catalogue, listed as just one standard configuration, although there was some limited scope to upgrade to better processor, graphics, storage and memory.
Now we have an additional offthe-shelf Retina 5K iMac with £400 shaved off the £1,999 (now reduced to £1,849) price of the original. Your £1,599 can buy an iMac with the same ultra-high resolution screen and all the usual trimmings, with savings made this time in the main Intel chip, the storage and graphics.
Build and design
In every respect this is the same iMac with Retina 5K display, using the same chassis with the same formidable build quality, and the same line of ports and connectors along the back. There’s two Thunderbolt 2 ports for high-speed peripherals and external displays, four USB 3.0, gigabit ethernet, and slot for SD cards up to SDXC specification and a headphone jack.
In place of the 3.5GHz Intel Core i5 quad-core processor is a slightly slower processor clocked at 3.3GHz. It’s from the same generation, a Core i5-4590 instead of Core i5-4690. Both chips have separate processor cores on the same die, and include Intel Turbo Boost 2.0 technology which here mildly overclocks up to 3.7GHz, where the faster processor can reach up to 3.9GHz.
These are regular four-core chips. In both cases, the processor is fixed at working on four threads, in contrast to the mobile-class processors found in most variants of Apple MacBooks, which include Hyper Threading Technology to give the effect of doubling the number of real cores. The memory quota and specification is the same as before, 8GB from two 4GB SO-DIMM modules, and you can easily upgrade this yourself from a removable hatch on the back
In our tests of the main processor, we saw close to the same speed as from the 3.5GHz processor, with benchmark scores around 5- to 6 percent lower.
From Geekbench 3, the new iMac with 5K Retina scored 3699 points with one core, and 11,792 while running four cores. Those figures