RAM (Random Access Memory) is the temporary workspace your Mac uses to hold everything currently running. Think of it as your desk: the bigger the desk, the more things you can have spread out at once before you have to start stacking things on top of each other. The complication with modern Macs is that you have to pick your desk size before you buy, because it cannot be changed afterwards.
This matters more than it used to. On older Macs, you could start with a modest amount and upgrade later if things got crowded. That option is gone. Every Apple Silicon Mac (M1, M2, M3, M4) has its memory built directly into the chip. Most Intel Macs from 2018 onwards are the same. Whatever you buy is what you will have for the next five to seven years.
Why does this decision matter so much?
There is a version of this question that was easy to answer five years ago: "just upgrade later if you need to." That answer no longer exists. Apple's decision to solder RAM to the processor means you are locking in your memory capacity at the point of purchase.
The good news: Apple Silicon handles memory more cleverly than the older Intel chips did. macOS uses a technique called memory compression, which squeezes inactive data into a smaller space to free up room for what you are actually using. It also uses fast SSD swap, which means when RAM runs low, it can temporarily park data on your storage drive and retrieve it quickly. The result is that 8GB on an M-series Mac genuinely performs better than 8GB on an Intel Mac of the same age did.
The less good news: that efficiency has limits. Memory compression helps, but it is not a substitute for actual RAM when you are running several demanding apps at once. And SSD swap, while fast, is still slower than real RAM, and it quietly wears down your SSD over time.
When 8GB is enough
If your daily Mac use looks like this, 8GB is genuinely fine in 2026:
- Browsing the web with a handful of tabs open
- Email and calendar
- Notes, documents, and spreadsheets
- Watching videos or streaming music
- Basic photo editing (casual edits in Photos or Lightroom, not heavy retouching)
- One or two apps open at a time, not a full desk of them
Apple Silicon makes 8GB go further than Intel ever did, and for genuinely light use, it holds up. A lot of people who think they need more RAM actually just need to understand what memory pressure is and manage it a little better.
The profile above covers a lot of people: retirees, students doing coursework, someone who uses their Mac for personal admin, a professional who keeps work and personal tasks mostly separate and does not live in a browser all day.
When 8GB is not enough
Things change when you start combining heavier demands. 8GB starts to feel tight when you are doing more than one of the following at the same time:
- Chrome with many tabs open (Chrome is a known memory consumer)
- Slack or Microsoft Teams running in the background
- A creative app like Photoshop, Premiere, or Final Cut
- A video call alongside other open apps
- Multiple large documents or spreadsheets open at once
The tell is when your Mac starts feeling sluggish even though it is not doing anything particularly intensive. If apps take longer to switch, tabs have to reload when you return to them, or the fan spins up unexpectedly, your Mac may be doing extra work to compensate for memory pressure. See why is my Mac so slow for the full diagnostic, or why is my MacBook so slow if you are on a laptop.
Apple's own guidance on reading memory pressure is worth a look: their official RAM-check guide walks through exactly how to tell if your Mac is running low.
The Apple Silicon difference
It is worth being precise about what Apple Silicon actually changes here, because there is a lot of vague "it's more efficient" talk that does not explain much.
On an Intel Mac, the CPU and GPU had separate memory pools. The processor had its own RAM, and the graphics card had its own VRAM. On Apple Silicon, both share a single unified memory pool. This means that memory used for graphics can be temporarily reclaimed for CPU tasks and vice versa, without any copying between separate chips. It is a more flexible system.
Combined with aggressive memory compression and faster SSD swap, the practical result is that an 8GB Apple Silicon Mac handles everyday multitasking noticeably better than an 8GB Intel Mac did. But the ceiling still exists: when all 8GB is genuinely in use, no amount of architectural cleverness creates more of it.
The £200 question: is 16GB worth it?
The upgrade from 8GB to 16GB typically costs around $200 USD or £200 at the time of purchase, depending on the model and where you buy. That is a meaningful number. Here is how to think about whether it is worth it.
The cost over time is small. If you keep the Mac for five years (which is typical), that is roughly $40 a year for meaningfully better performance and less daily frustration. For most people, that maths works out.
The resale difference is real. When you eventually sell the Mac or trade it in, 16GB models sell faster and for more on the second-hand market. Buyers know they cannot upgrade RAM themselves and want headroom. The premium you paid at purchase often comes back, at least partially, at resale 3 to 5 years later. 8GB models typically require a steeper discount to find a buyer.
Storage is a different trade-off. Some people try to save money by choosing 8GB RAM and more storage, or 16GB RAM and less storage. These are not equivalent. Storage can be worked around with external drives and cloud services. RAM cannot. Do not sacrifice RAM for storage if you have to pick one.
The honest answer for most people: pay the extra for 16GB. Not because 8GB is broken, but because you cannot change your mind later, your use will probably drift heavier over the years, and the upgrade cost amortised over the Mac's life is genuinely modest. The only situation where 8GB is the right call is if you are certain your use is light and will stay that way.