How Much Unified Memory Photographers Need: 16GB vs 24GB on the M5 Mac

The memory decision on a Mac is the one you can never undo. Unlike a Windows laptop where you might pop the back panel and add a stick later, Apple solders unified memory to the chip at manufacture, so the number you choose at checkout stays fixed for however long you own the machine. For a photographer weighing 16GB against 24GB on an M5 Mac, that permanence is the whole story, and it deserves more thought than the spec sheet suggests.

Quick Answer

For most photography workflows, 16GB of unified memory is genuinely enough for RAW editing in Lightroom and Photoshop. Step up to 24GB if you also edit video, run a very large catalogue, or keep many heavy apps open at once. The memory cannot be upgraded later, so when you are genuinely unsure, 24GB is the safer permanent choice. The price gap is usually a few thousand Rand.

Why Unified Memory Changes the Maths

The M5 chip pools its processing, graphics, and AI resources into one shared allocation rather than splitting them into separate buckets. That is what makes it unified, and the efficiency is real: data does not have to be copied back and forth between system memory and a separate graphics pool, which is part of why these machines feel quick even at modest memory sizes.

But the efficiency cuts both ways. A single number has to cover everything at once. When you are editing a RAW file, that same pool is feeding the display, the operating system, your browser tabs, and whatever else is running. A Windows photographer can treat system RAM and graphics memory as two separate budgets. On a Mac, it is one budget, and the size is fixed the day you buy.

Soldered Means Soldered

This bears repeating because it catches people out. There is no slot, no spare channel, no aftermarket upgrade. A shop cannot add memory to your Mac the way they could to a desktop tower. If you buy 16GB and your needs grow, selling the machine and starting again is the only path forward. That single fact should push your thinking toward the workload you expect in three or four years, not just the one you have today.

What RAW Editing Actually Demands

RAW photo editing is, somewhat surprisingly, not the heaviest task you can throw at a modern Mac. A single high-resolution RAW file might be 30 to 60 megabytes on disk, and even a 45-megapixel image unpacks to something a 16GB machine handles comfortably. Lightroom and Capture One are built to work on one image at a time in the develop view, caching intelligently and leaning on fast storage when they need to.

Where 16GB holds up well:

• Culling and editing single RAW files in Lightroom or Capture One
• Standard retouching in Photoshop with a handful of layers
• Catalogues in the low tens of thousands of images
• Exporting batches while you carry on browsing

Where 16GB starts to feel tight:

• Photoshop files with dozens of high-resolution layers, smart objects and masks
• Heavy focus stacking or panorama stitching from many large frames
• Running Lightroom, Photoshop and a browser full of tabs simultaneously
• Any video editing alongside your photo work

The current MacBook range stocked at Evetech covers both memory tiers across the Air and Pro lines, so the choice is less about which model and more about which configuration of that model.

When 24GB Earns Its Place

The case for 24GB is really a case about headroom and the future. Three situations justify it clearly.

You Edit Video As Well As Photos

This is the strongest reason. Video editing, even light 4K work in Final Cut or Premiere, is far more memory-hungry than stills. Timelines, effects and previews all sit in memory at once. If your photography sometimes turns into a short film, a reel, or client video, 24GB stops the machine from leaning hard on swap memory mid-edit.

You Keep a Very Large Catalogue

Lightroom keeps previews and metadata for your whole library in play, and a catalogue running into six figures of images behaves more smoothly with more memory to hold those previews. A wedding or commercial photographer who shoots tens of thousands of frames a year will feel the difference over time.

You Are a Heavy Multitasker

If your normal working state is Lightroom plus Photoshop plus a dozen browser tabs plus a messaging app plus music, the shared pool fills faster than you would expect. 24GB gives that habit room to breathe without the system constantly shuffling data to storage.

Reading the Activity Monitor Signal

The honest way to judge your own need is to look at how your current machine behaves. On macOS, Activity Monitor has a Memory Pressure graph. Green means you have headroom, yellow means the system is working to manage memory, and persistent yellow or red under your normal workload is the clearest sign you would benefit from more. Swap usage climbing into the gigabytes during a typical session is the same signal. If your present machine sits comfortably green doing the work you do, 16GB on a newer, faster M5 chip will serve you well.

The SA Buying Angle

Because this purchase is permanent and a Mac is a significant Rand outlay, the calculus tilts toward buying slightly more memory than you need rather than slightly less. The upgrade from 16GB to 24GB typically adds a few thousand Rand to the price. Spread across the three-to-five years you will likely keep the machine, that is a small premium against the alternative, which is selling and rebuying an entire laptop to gain memory you could have specified up front.

For a working photographer whose income depends on the machine, that headroom is cheap insurance. For a student or enthusiast editing on the side, 16GB is rarely the thing that holds them back, and the money is often better spent on storage or a calibrated display. If you are still comparing configurations, the laptop best-sellers list reflects what most SA buyers are actively choosing.

Who Should Buy Which

A clean way to decide:

• Choose 16GB if you edit primarily RAW stills, keep a moderate catalogue, and rarely touch video. This is the right, not the compromised, choice for most photographers.
• Choose 24GB if you also edit video, run a large catalogue, multitask heavily, or simply want maximum longevity from a machine you cannot upgrade.

There is no wrong answer here, only the answer that matches how you actually work. The mistake is choosing on price alone and then wishing, two years in, that you had thought about the soldered reality before you clicked buy.

Frequently Asked Questions

Can I add memory to my Mac later if I run out?

No. Unified memory is soldered to the chip during manufacture and cannot be upgraded, replaced, or expanded afterwards. Buying a different Mac is the only route to more memory, which is why the decision at purchase is final.

Is 16GB enough for professional Lightroom work?

For most professional RAW editing, yes. Lightroom is well optimised for Apple silicon and handles single-image editing and reasonable catalogues comfortably on 16GB. The professionals who genuinely need more are usually those combining photo work with video.

How does Mac unified memory compare to regular laptop RAM?

The M5 chip pools processing, graphics, and AI resources into one shared allocation, which is more efficient than separate system and graphics memory but cannot be split or upgraded. A given amount of unified memory often goes further than the same number on a traditional laptop, though the lack of upgradeability is the real consideration.

Does more memory make RAW editing faster?

Only to a point. Once you have enough memory to hold your working set without spilling to storage, adding more does not speed up editing a single image. It mainly helps when you multitask, run heavy multi-layer files, or work with video.

Should I spend on memory or storage first?

If you edit mostly stills, storage and a good display often matter more than going from 16GB to 24GB. If you edit video or multitask heavily, prioritise the memory, since storage can be supplemented with external drives but memory cannot be changed at all.