Apple iMac 21.5-inch with Retina 4K Display price, specs, review 價錢、規格及用家意見

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The battle for the smartphone flagship supremacy rages on, as the best from Samsung and Apple look to be crowned as the best smartphone in the market today. The Samsung Galaxy S9 is the Android phone to beat but how does it fare with Apple’s top contender - the iPhone X? With both phones boasting top-of-the-line features and specifications, this is easily one of the closest phone matchups to date. To end the debate once and for all, let’s delve deeper to identify what both phones bring to the table:

The battle for the smartphone flagship supremacy rages on, as the best from Samsung and Apple look to be crowned as the best smartphone in the market today. The Samsung Galaxy S9 is the Android phone to beat but how does it fare with Apple’s top contender - the iPhone X? With both phones boasting top-of-the-line features and specifications, this is easily one of the closest phone matchups to date. To end the debate once and for all, let’s delve deeper to identify what both phones bring to the table:


Apple iMac 21.5-inch with Retina 4K Display Specs

Release Date in Hong Kong
Model21.5" Retina 4K
DateOct 2015
Processor
Processor frequency3.1 GHz
Processor family5th gen Intel® Core™ i5
Processor cores4
Processor boost frequency3.6 GHz
Memory
Internal memory16 GB
Maximum internal memory16 GB
Internal memory typeLPDDR3-SDRAM
Memory clock speed1867 MHz
Memory slots2
Memory slots typeSO-DIMM
Memory layout (slots x size)2 x 8 GB
Memory form factorOn-board
Optical drive
Optical drive typeNo
Display
Display diagonal54.6 cm (21.5")
Display resolution4096 x 2304 pixels
HD type4K Ultra HD
LED backlightYes
TouchscreenNo
Detachable displayNo
Screen shapeFlat
Full HDYes
Aspect ratio16:9
Panel typeIPS
Audio
Built-in speaker(s)Yes
Built-in microphoneYes
Ports & interfaces
Ethernet LAN (RJ-45) ports1
USB 3.0 (3.1 Gen 1) Type-A ports quantity4
Headphone outputs1
Thunderbolt 2 ports quantity2
DVI portNo
Combo headphone/mic portYes
Mini DisplayPort/Thunderbolt combo portYes
Weight & dimensions
Width528 mm
Depth175 mm
Height450 mm
Weight5.68 kg
Power
Autonomy modeNo
AC adapter frequency50/60 Hz
AC adapter input voltage100 - 240 V
Networking
Wi-FiYes
Wi-Fi standards802.11a,Wi-Fi 5 (802.11ac),802.11b,802.11g,Wi-Fi 4 (802.11n)
Ethernet LANYes
BluetoothYes
Ethernet LAN data rates10,100,1000 Mbit/s
Bluetooth version4.0
Storage
Total storage capacity2000 GB
Card reader integratedYes
Compatible memory cardsSDXC
Number of storage drives installed1
Software
Operating system installedMac OS X 10.11 El Capitan
Bundled software- iPhoto\n- iMovie\n- GarageBand\n- Pages\n- Numbers\n- Keynote\n- iBooks\n- Safari\n- FaceTime\n- Time Machine\n- Photo Booth\n- iTunes\n- Game Center
Design
Product colourSilver
Cable lock slotYes
Cable lock slot typeKensington
Graphics
On-board graphics adapterYes
On-board graphics adapter modelIntel® Iris™ Pro Graphics 6200
On-board graphics adapter familyIntel® Iris™ Pro Graphics
Performance
Product typeAll-in-One PC
Multimedia
Built-in cameraYes

Reviews of Apple iMac 21.5-inch with Retina 4K Display

theverge.com
Reviewed on 2015-11-05
The best all-in-one there is, now in both 4K and 5KLast year's iMac brought the Retina display to Apple's desktop product line in dramatic fashion. The 27-inch 5K screen was a jaw-dropping addition that made the all-in-one impossible to look away from. An...
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appleinsider.com
Reviewed on 2015-11-03
4K Retina display with P3 color gamut, Powerful internals, Small footprint
5,400 rpm HDD is a snail, Price borders on 27inch 5K iMac, Slight backlight bleed at screen periphery
Apple's marketing team didn't need to dig deep to dream up a campaign for the new 21.5‑inch iMac with Retina 4K display —its best feature is in the name. The stellar ultra high-resolution screen mates well with Apple's chosen internals, but it would have...
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4k.com
Reviewed on 2015-10-22
Superb color rendering with DCI-P3 color space, Fast, powerful machine for most uses, Beautiful design, Wonderfully quiet, cool running, Decent price tag, 9.4 million pixels, El Capitan OS X works great with 4K display
No HDMI connectivity, Uses slightly older Intel processing chip architecture, No discrete Graphics card technology, Storage memory could have been more advanced
As we can pretty much expect of any Apple product and especially of any high-end Apple computing device, the 4K iMac is a fantastic performer on the whole. Its new single-fan cooling arrangement not only keeps the machine's temperature lower than what was...
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arstechnica.com
Reviewed on 2015-10-13
Gorgeous screen with an improved color gamut, Retina scaling modes let you use the 21.5-inch iMac to display as much information as the 27-inch iMac, a nice feature for people without much space, Quad-core Broadwell CPUs aren't the newest on the block but...
No dedicated GPU options, and the integrated GPU chugs if you increase the resolution or hook up another 4K display, No user-accessible RAM (or any user-accessible parts, really), No Thunderbolt 3 or USB Type-C, No Target Display Mode, Putting all the por...
Andrew CunninghamThe new 4K iMac hooked up to an external 4K display.Andrew CunninghamThe new 4K iMac hooked up to an external 4K display.Andrew CunninghamThe back of the iMac. It really does look exactly like the non-Retina models.Andrew CunninghamNearly...
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cnet.com
Reviewed on 2015-10-13
Apple upgrades the 21.5-inch iMac with a stunning 4K-resolution display, along with faster processors and Thunderbolt 2. The redesigned keyboard, mouse and trackpad all have rechargeable batteries and lightning connectors
The new processors are still one generation behind Intel's latest and there are no discrete graphics options. No HDMI input means it can't double as a TV monitor
Last year's addition to the 21.5-inch Apple iMac line caught our attention by cutting the starting price to $1,099 (£899 or AU$1,349) and positioning itself as essentially a MacBook Air recast as a desktop system; the new version for 2015 aims higher.The...
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macworld.com
Reviewed on 2015-10-13
Gorgeous Retina screen, Thunderbolt 2 support
Fast flashstorage available as an option, Hampered by slow 5200 rpm hard drive, Discrete GPU available only as configuration option, Uses previous generation Intel chipset
The Mac is a small fraction of Apple's total business, and of that, roughly three-quarters of the Macs sold are laptops. Apple could probably be forgiven if it put the entire iMac line into maintenance mode: after all, sometimes it seems like that's what...
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goodgearguide.com.au
Reviewed on 2015-10-13
The Mac is a small fraction of Apple's total business, and of that, roughly three-quarters of the Macs sold are laptops. Apple could probably be forgiven if it put the entire iMac line into maintenance mode: after all, sometimes it seems like that's what...
Read more >
canadianreviewer.com
Reviewed on 2016-01-04
With the 4K 21.5-inch iMac and the 5K 27-inch iMac before it, Apple has made 4K technology a compelling feature for next generation computer displays and all-in-one PCs in a way that many TV manufacturers have failed to so for high-end 4K TV sets.A 4K Dis...
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