The MacBook Neo’s entire premise rests on one audacious question: can a smartphone chip carry a laptop? Apple’s answer was to drop the A18 Pro from the iPhone 16 into a fanless aluminum chassis and ship it. For everyday tasks, the answer is largely yes. For gaming under sustained load, the answer hits a wall at 105°C, where the chip pulls back its clocks to avoid cooking itself inside a case with no fan and no active cooling to speak of. The MacBook Neo is a genuinely compelling machine, repairability included since Apple ditched adhesive entirely and built the whole thing around screws, but that thermal ceiling is a real and measurable constraint.
ETA Prime ran the experiment that every thermally curious engineer has probably daydreamed about: what happens when you actually cool this thing properly? First, a custom copper heat sink bridging the chip to the aluminum shell. Then a liquid-cooled thermoelectric Peltier unit clamped magnetically to the outside. Gaming framerates climbed from 30 to 80 FPS. Cinebench single-core jumped 23.5% over stock. The A18 Pro was never the bottleneck. The cooling was.
Designer: ETA PRIME
The copper heat sink is the more elegant of the two mods, and honestly the more important one. ETA Prime removed the stock graphene pad using a heat gun, cleaned the A18 Pro die with isopropyl alcohol, and applied Noctua thermal paste directly to the chip. A sheet of copper, cut to cover the full mainboard, sits on top. An Arctic TP3 thermal pad on the upper face of the copper makes contact with the MacBook Neo’s aluminum bottom shell when the screws are tightened back down, turning the entire chassis into a proper heat spreader. The graphene pad was cut in half and kept over the surrounding components for protection, but the CPU die itself is now in a real thermal pathway for the first time. With just this mod in place, No Man’s Sky jumped from 30-31 FPS to 58 FPS, average CPU temps dropped to around 83-84°C, and Geekbench 6 multi-core climbed 9.7% while single-core gained 15.2%. A sheet of copper and a tube of paste did what Apple’s entire thermal design could not.
The Peltier cooler is the wilder addition, and it is admittedly overkill in the best possible way. The unit ETA Prime used was originally designed as a phone cooler, a liquid-cooled thermoelectric device with three power settings topping out at 50 watts. One side extracts heat, the other reaches below-freezing temperatures, and ice visibly forms on the cold plate within about a minute of operation. It attaches magnetically to the bottom of the Neo, aligning with the copper heat sink beneath the shell, and pulls the chip’s average idle temp down to 23°C. Under gaming load in No Man’s Sky, the CPU sat at roughly 74°C, and framerates held at 58-59 FPS with VSync engaged. Over a 30-minute sustained session, the machine averaged around 80 FPS at 1408×881 on enhanced settings with Metal scaling set to balanced, compared to the low 30s it would have delivered in stock form.
The benchmark gains with the full liquid cooling setup are worth spelling out. Geekbench 6 multi-core reached 9,394, an 18.6% improvement over the stock 7,921. Single-core hit 3,636, up 17.52%. Cinebench multi-core landed at 1,741 against a stock score of 1,462, a 19% gain, while single-core climbed from 502 to 620, a 23.51% improvement. ETA Prime also tested Fallout 4 running through Crossover, the compatibility layer that lets non-Mac titles run on Apple silicon, and the Neo held a consistent 60 FPS despite relying on SSD swap for additional memory beyond its 8GB ceiling.
The 8GB cap remains the machine’s most stubborn limitation, and no amount of copper or Peltier magic changes that. When the unified memory fills, the Neo starts leaning on SSD swap, which is slower and adds latency that thermal improvements cannot compensate for. It is a real constraint for anyone expecting to run memory-hungry titles at length. That said, the performance ETA Prime extracted here from a chip that costs less than many gaming peripherals is genuinely impressive, and the copper mod in particular requires no permanent modifications and costs almost nothing.
The Peltier is obviously not a portable solution. It draws significant power, runs a liquid loop, and magnetically attaches to the outside of the machine like a barnacle. But the copper mod absolutely is portable, costs next to nothing in materials, and on its own delivers close to double the sustained gaming performance. ETA Prime also tested Fallout 4 running through Crossover on the liquid-cooled setup, hitting a continuous 60 FPS despite the Neo’s 8GB RAM ceiling forcing the system to lean on SSD swap for additional memory. The A18 Pro has more headroom than Apple’s thermal design ever lets it show, and a sheet of copper is apparently all it takes to prove it.
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