The M3 iMac (released October 2023) is the direct successor to the M1 iMac (released April 2021). The chassis is identical, the colors are essentially the same, and the screen has not changed. The differences are almost entirely under the hood — and they are real, even if they are not the kind of "wow, what a redesign" leap some buyers were hoping for.
What is identical:
What actually changed with M3:
Yes, but with real limits — and the answer depends on which configuration you bought.
Entry-level (8-core GPU) iMac M3:
Officially supports one external display with up to 6K resolution at 60Hz, in addition to the built-in 4.5K Retina display. Apple's M3 chip in the iMac caps total displays at two: the internal panel plus one external.
Higher-tier (10-core GPU) iMac M3:
Same answer. The external display ceiling on the iMac variant of M3 is one external monitor, regardless of which GPU core count you picked. The two extra USB-C ports on the higher-tier model are USB 3 only, not Thunderbolt, so they cannot drive an additional display directly.
This is a real constraint. The MacBook Pro and Mac mini variants of the M3 (M3 Pro / M3 Max) support more external displays, but the base M3 — which is what every iMac 2023 ships with — is limited to one external panel by design. Apple has been very explicit about this in the iMac tech specs.
What works "officially":
Short answer: no. The SSD on the 2023 M3 iMac is not user-upgradeable. Whatever capacity you order at checkout is the capacity you have for the life of the machine, full stop.
Why it cannot be upgraded:
On Apple Silicon Macs, the SSD is implemented as raw NAND flash chips soldered directly to the logic board. There is no M.2 slot, no SATA bay, and no proprietary blade module like older Intel MacBooks had. The storage controller lives inside the M3 system-on-chip itself, and the NAND modules on the logic board are paired to that controller via Apple's hardware-secured boot chain. Even Apple's own service technicians do not "upgrade" SSDs in the field — when storage fails, the entire logic board is swapped.
The capacities Apple offers at order time:
A note about the 256GB base config:
The 256GB SSD on the M3 iMac uses a single NAND chip, which means slower sequential read/write speeds compared to the 512GB and larger configurations that use two or more NAND chips operating in parallel. Real-world testing has consistently shown the 256GB drive com
The iMac 2023 with M3 starts at 8GB of unified memory in the base configuration, and that is the spec the vast majority of buyers walk out the door with. It can be configured up to 16GB or 24GB at the time of purchase, but those upgrades are order-time only — once your iMac is built, the memory is soldered to the M3 chip package and cannot be changed.
The configurations Apple offers:
Why "unified memory" matters here:
This is not the traditional DDR4 or DDR5 DIMM you would find in an Intel-era iMac. Apple Silicon chips like the M3 use a single pool of memory that the CPU, GPU, Neural Engine, and media engines all share at very high bandwidth. There are no VRAM-versus-system-RAM tradeoffs to think about — graphics workloads pull from the same pool as your apps, the OS, and background processes.
The practical effect is that 8GB on an M-series Mac feels meaningfully different than 8GB on a comparable Intel machine, because nothing is being copied back and forth between separate memory regions. That said, "different" does not mean "infinite" — heavy multitasking,
The iMac 2023 with M3 splits its port layout across two configurations, and which one you get depends on whether you choose the entry-level model or step up to the higher-tier configuration.
Entry-level (8-core GPU) model:
That is it. No Ethernet, no extra USB-C ports, and no USB-A anywhere on the machine. The two Thunderbolt ports each support up to 40 Gb/s data transfer, DisplayPort, USB 4 (40 Gb/s), and Thunderbolt 3 (40 Gb/s).
Higher-tier (10-core GPU) model:
The Ethernet-in-the-power-brick design is worth flagging because it means the only cable running into the back of the iMac itself is the power/Ethernet combo cable. Cleaner desk, but if you want to swap the iMac to a different room with no Ethernet drop, the wired-network capability comes along for the ride only because it lives in th
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