Laatste update: 25 juli 2025

Which iMac should you choose: 21.5-inch vs. 27-inch with Fusion Drive?

Which iMac is right for you?

Big or small? Powerful or compact? The 21.5-inch iMac with Fusion Drive beckons. But there's also the 27-inch version with a faster processor . It's not just about specs and screen size. The real question is how these machines change your workflow. Think about your workspace, your eyes, and your projects. Because an iMac is more than just a regular computer—it's an extension of yourself. The perfect match might not be in the obvious choice. Consider the details carefully, because you'll discover the right iMac along the way.

Screen size and resolution

The most noticeable differences between these two iMac models are the screen size and resolution:

  • 21.5-inch model:
    • Compact size, ideal for smaller workspaces
    • 4K Retina display (4096 x 2304 pixels)
    • Pixel density of 219 ppi
  • 27-inch model:
    • Larger work surface, suitable for multitasking and graphic work
    • 5K Retina display (5120 x 2880 pixels)
    • Pixel density of 218 ppi

While both screens offer comparable sharpness, the larger screen gives you more real estate for opening multiple windows side by side.

Processor and performance

Both models are equipped with Intel Core i5 processors, but there are differences in speed:

  • 21.5-inch: 3.0 GHz 6-core Intel Core i5
  • 27-inch: 3.7GHz 6-core Intel Core i5

The 27-inch model has a higher clock speed, which theoretically delivers better performance for processing-intensive tasks like video editing or 3D rendering.

Storage and memory

The storage configurations differ significantly:

  • 21.5-inch: 1 TB Fusion Drive
    • Combines fast SSD storage with a traditional hard drive
    • Offers a balance between speed and storage capacity
  • 27-inch: 512 GB SSD
    • Fully solid state, which provides faster boot times and file access
    • Less storage space, but noticeably faster in use

In terms of working memory:

  • 21.5-inch: Not specified in the product name, but often 8 GB as standard
  • 27-inch: 8 GB RAM

It's important to note that many iMac models allow for memory upgrades to be made later, especially the 27-inch version.

Graphics capabilities

Although not explicitly stated in the product descriptions, both models typically have the following graphics options:

  • 21.5-inch: Usually equipped with a Radeon Pro 555X or 560X
  • 27-inch: Often equipped with a Radeon Pro 570X, 575X, or 580X

The larger iMac typically has more powerful graphics capabilities, making it more suitable for tasks like video editing, 3D modeling, and gaming.

Connections and expandability

Both models offer similar connection options:

  • Thunderbolt 3 (USB-C) ports
  • USB 3 ports
  • Ethernet
  • SD card reader

The 27-inch model often has more Thunderbolt 3 ports, which provides additional flexibility for connecting external devices and displays.

Price and value

Prices may vary depending on the seller and any offers, but generally speaking:

  • 21.5-inch model: More affordable, offers good value for general use
  • 27-inch model: More expensive, but offers more screen space and usually better specs

Usage scenarios

  • 21.5-inch iMac:
    • Ideal for home use, students, and small office spaces
    • Suitable for daily tasks, light photo editing, and general productivity
    • Good choice for those looking for a compact yet powerful system
  • 27-inch iMac:
    • Excellent for professionals in graphic design, video editing, and software development
    • Suitable for users who often work with multiple applications simultaneously.
    • Offers more growth opportunities in terms of performance and screen space

Sustainability and energy consumption

Apple is committed to sustainability in all its products:

  • Both models are made with recycled materials
  • Energy-efficient components and smart energy management features
  • The 27-inch model may consume slightly more power due to its larger screen

Availability and support

  • Both models are available through the Apple Store, Authorized Resellers, and refurbished channels
  • Apple offers the same warranty and support options for both models
  • Repairs and parts are generally available longer for newer models

Choice aid summary

The 21.5-inch iMac is a compact all-in-one solution, ideal for those with limited space and looking for an affordable yet capable Mac. The 27-inch version offers a larger workspace and more powerful specifications, making it more suitable for demanding tasks and professionals. Consider your budget, available space, and type of work carefully when making your choice.

Choosing the right iMac

The choice between the 21.5-inch and 27-inch iMac goes beyond screen size. The compact 21.5-inch model with Fusion Drive offers an excellent balance of performance and storage space, ideal for home use and smaller workspaces. The 27-inch model, with its larger 5K display and faster processor, provides more power and workspace for professional applications. Carefully consider your available space, budget, and work requirements. Both models offer signature Apple quality. See the specifications of the 21.5-inch iMac or 27-inch iMac for more details.

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