After five years with Apple silicon, from the original M1 MacBook Air to the M5 MacBook Air released earlier this year, I’ve watched these chips mature not just on the spec sheet, but in real-world workflows and overall efficiency.
The new M6 chip might sound like a routine generational upgrade, but it’s the company’s first chip built on a 2nm manufacturing process, which brings meaningful improvements over previous Apple chips.
The previous iMac used the M4 chip, making this comparison even more interesting. Apple’s M6 iMac marks a two-generation leap. While it retains the same thin, colorful chassis, 24-inch 4.5K display, integrated speakers, and Center Stage camera, the performance and on-device AI leap is significant.
M6 iMac vs. M4 iMac: Tech specs at a glance
| Spec | iMac (M6, two ports) | iMac (M6, four ports) | iMac (M4, four ports) |
| Starting Price | From $1,499 | From $1,699 | Originally $1,499 — later $1,699 (now discontinued) |
| Processor (SoC) | Apple M6 (2nm) – 10-core CPU (2 super + 3 performance + 5 efficiency) |
Apple M6 (2nm) – 12-core CPU (2 super + 4 performance + 6 efficiency) |
Apple M4 (3nm) – 10-core CPU (4 performance + 6 efficiency) |
| Graphics (GPU) | 10-core GPU with Neural Accelerators in every core + Hardware-accelerated ray tracing | 12-core GPU with Neural Accelerators in every core + Hardware-accelerated ray tracing | 10-core GPU with Hardware-accelerated ray tracing (no dedicated Neural Accelerators per core) |
| Memory Bandwidth | Up to 170 GB/s | Up to 170 GB/s | 120 GB/s |
| Unified Memory Options | 16 GB, 24 GB | 16 GB, 24 GB, 32 GB | 16 GB, 24 GB, 32 GB |
| Storage Options | 256 GB, 512 GB, 1 TB SSD (up to 2× faster than M4) |
256 GB, 512 GB, 1 TB, 2 TB SSD (up to 2× faster than M4) |
256 GB, 512 GB, 1 TB, 2 TB SSD |
| Neural Engine | Dual 16-core (32 cores total) | Dual 16-core (32 cores total) | Single 16-core |
| Media Engine | Hardware-accelerated H.264, HEVC, ProRes, ProRes RAW + AV1 decode | Same as left | Same |
| Display | 24-inch 4.5K Retina (4480 × 2520), 500 nits, P3, True Tone | Same + optional nano-texture glass | Same + optional nano-texture glass |
| Size & Weight | 18.1 × 21.5 × 5.8 in, 9.7 lbs | 18.1 × 21.5 × 5.8 in, 9.8 lbs | 18.1 × 21.5 × 5.8 in, 9.79 lbs |
| Wireless Connectivity | Wi-Fi 7 + Bluetooth 6 + Apple N1 chip + Thread | Same | Wi-Fi 6E + Bluetooth 5.3 |
| Ports | Two Thunderbolt / USB 4 ports | Four Thunderbolt 4 ports | Four Thunderbolt 4 ports |
| Ethernet | Configurable 2.5 Gb Ethernet (+$30) | Standard 2.5 Gb Ethernet | Standard Gigabit Ethernet |
| External Displays | One external up to 6K@60 Hz or 4K@165 Hz | Two external up to 6K@60 Hz / 4K@165 Hz or one up to 8K@60 Hz / 5K@120 Hz / 4K@240 Hz |
Two external up to 6K@60 Hz or one up to 8K@60 Hz |
| Secure Authentication | Configurable with Touch ID | Standard Touch ID | Standard Touch ID |
| Keyboard | Magic Keyboard or Magic Keyboard with Touch ID + Numeric Keypad | Magic Keyboard with Touch ID or with Touch ID + Numeric Keypad | Same as M6 Four Ports |
| Camera & Audio | 12MP Center Stage + Desk View; six-speaker system with Spatial Audio; three-mic array | Same | Same |
| Colors | Blue, Green, Pink, Yellow, Purple, Orange, Silver | Same | Same |
M6 iMac vs. M4 iMac: Where does all the tech talk make a real-world difference?
Let’s start with the elephant in the room (or rather, the ant, since 2nm is freakishly small). Moving from the M4’s 3nm FinFET fabrication tech to a first-gen 2nm layout lets Apple increase the core counts without the usual power or heat penalties.
While the higher-spec M4 featured a 10-core CPU, the matching M6 reaches 12 cores (with two new super cores). From my experience with different M-series chips, those additional cores really help by keeping things smooth and responsive as you switch between heavy apps (or intensive multitasking).
Apple claims that the M6 iMac is up to 40% faster with respect to general processing, and that isn’t worth ignoring. The iMac should perform better under sustained load, especially when it comes to dealing with big Xcode projects, complex spreadsheets, and multi-layer Affinity files.
The GPU core counts also clim from 10 to 12, wherein every core gets its own Neural Accelerator, with upgraded Dynamic Caching and ray-tracing. Whether you’re editing videos, designing 3D models, or producing audio, more cores (and more CPU power) translates to faster render times, more flexibility with complex designs, and reduced processing times altogether.
In the photo-editing and light 3D work I do regularly, those changes usually translate to snappier brush response and higher, more stable frame rates in ray-traced scenes. Because the M6 uses unified memory, the GPU also benefits from the increase in the memory bandwidth to 170 GB/s.
For those interesting in gaming on the iMac, Apple claims up to two times better gaming performance, and on paper. If not 2x, In simpler terms, you’ll get more stable frame rates, noticeably better reflections and textures, and better graphics quality in general.
AI is the area where I see the largest day-to-day shift. The M4’s single 16-core Neural Engine becomes a dual 16-core setup on the M6. With a total of 32 cores to handle the on-device Apple Intelligence features and local language models (via software like LM Studio or Ollama) working behind them, the M6 iMac should feel substantially more responsive.
Apple claims up to 5x better AI performance, but I generally take those claims with a pinch of salt. For me, the improvements should reflect in day-to-day Apple Intelligence features.
So, when you send a massive document with hundreds of pages, code file, or comprehensive query with multiple informational check points, the M6 iMac should ingest and understand that prompt quicker, It should also take less time to respond. Features like Visual Intelligence, Image Playground, Clean Up, and Writing Tools shouldn’t keep you waiting as long either.
You see? There’s so much that the chip upgrade unlocks. Other additions like the higher memory bandwidth and the faster SSD should help all the fancy additions on the ground by making more room for what the memory and the chipset can do; they don’t create a performance bottleneck.
Everything from multitasking, heavy app launches, and massive file transfers should feel buttery smooth.
Connectivity finally catches up with Wi-Fi 7, Bluetooth 6 (thanks to Apple’s N1 chip). And there’s Thread support as well. Wired networking moves from Gigabit to 2.5 Gb Ethernet (standard on the four-port model, a $30 option on the two-port). However, both the four Thunderbolt ports and the faster 2.5 Gb Ethernet are exclusive to the higher-end configuration; something to keep in mind.
A few smaller improvements sit at the edges. External 4K displays gain higher refresh-rate options, and the four-port model handles multiple monitors with a bit more flexibility.
M6 iMac vs. M4 iMac: Should you upgrade?
Pricing lands exactly where the M4 settled after its mid-cycle price increase: $1,499 for the 10-core, two-port configuration and $1,699 for the 12-core, four-port version.
For first-time buyers, the M6 iMac is the clearer choice, with more performance and a longer runway ahead. But if you already own an M4 iMac, the decision is less straightforward. I’d recommend upgrading only if you’re regularly hitting the M4’s performance ceiling and it’s starting to hold back your workflow.
The M4 remains a capable chip, and if it still handles everything you throw at it, there’s little reason to rush an upgrade. I’d sit this generation out. But if you’re coming from an older iMac, particularly an M1 or M3 model, the M6 could feel less like an upgrade and more like a whole new machine, breathing new life into your setup and unlocking workflows that once felt out of reach.
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