Comprehensive comparison of the performance of the new 21.5-inch iMac compatible with 4K with the old iMac, the latest MacBook Pro, etc.

21.5-inch iMac has a long-awaited 4K (4096 × 2304) display mounted "21.5 inch iMacRetina 4K display model"Has appeared. Although its 21.5-inch iMacRetina 4K display model has almost no change from the old model, it adopts not only Retina 4K display but also a new CPU, and the storage connection corresponds to PCI-Express 3.0 × 4, the contents are complete It has become a renewal model. About such a renewed 21.5-inch iMacRetina 4K display model,Ars TechnicaIs compared with the older model iMac and the latest MacBook Pro and so on.

Same design, new insides, better screen: 21.5-inch 4K Retina iMac reviewed | Ars Technica
http://arstechnica.com/apple/2015/10/same-design-new-insides-better-screen-21-5-inch-4k-retina-imac-reviewed/

For the 21.5-inch iMacRetina 4K display model with Retina 4K resolution with resolution 4096 × 2304 pixels, and the new 27-inch iMac with all models loaded with 5K display, you can check with the following article.

Ultimately, 21.5 inch iMac for 4K is released, mouse, keyboard, trackpad is renewed - GIGAZINE


The main specifications of "21.5-inch iMacRetina 4K display model" to verify performance are as follows. The display uses a resolution of 4096 × 2304 pixels, a 4K display with a pixel density of 217 ppi, CPU uses Core i 5 - 5675 R (Intel Iris Pro 6200 graphic), 8 GB of DDR 3 memory, and storage uses 1 TB and 5400 rpm hard disk.


◆ Color gamut
Firstly we verified the color gamut of a 4K display. It's sRGB and like this.


Supports over 99% color gamut of DCI-P3. In order to support this wide color gamut, the backlight LED has been changed from the white single color of the conventional model to the LED adopting the red phosphor and the green phosphor.


Although the 21.5-inch iMacRetina 4K display model can be outputted externally at 3840 x 2160 via DisplayPort 1.2, it can not output to the secondary display at 4 K resolution at the same time.

◆ Various benchmarks
In the 21.5-inch iMacRetina 4K display model, the 5th generation Intel Core processor "Broadwell"CPU adopted. The new 27-inch iMac series is the 6th generation Intel Core processor "Skylake"CPU is adopted and differentiation is aimed at between 21.5 inch model and 27 inch model.

·Geekbench 3
In the Mac benchmark, score is measured with familiar Geekbench 3. Looking at the orange graph showing the total score of the single core performance, the 21.5-inch iMacRetina 4K display model adopted by Core i 5 - 5765 R is based on the Core i 7 - 4870 adopted MacBook Pro (2015 model) and Core i 5 - 4570 R It exceeds the performance of the old 21.5-inch iMac.


Multi-core performance is slightly less than that of MacBook Pro (2015 model).


·CINEBENCH R 15
Comparing the CPU performance with the CINEBENCH R15 in the 64-bit environment, both the single core and the multicore outperform the MacBook Pro (2015 model).


However, graphic performance is not as good as MacBook Pro (2012 model) with GeForce GT 650M as well as MacBook Pro (2015 model) equipped with Radeon R9 M370X.


·GFXBench 3
In off-screen mode to compare with 1080p resolution of GFXBench 3, the 21.5-inch iMacRetina 4K display model is compatible with other models.


However, in on-screen mode comparing with the standard resolution of that model has resulted in a losing defeat.


·QuickBench
Comparing the storage performance using QuickBench for MacOS X, the 21.5-inch iMacRetina 4K display model of PCI-Express 3.0 × 4 connection wins the game. It is clear that the storage performance has evolved dramatically.