Apple’s entry-level Mac mini models — those shipped with just 256 GB of storage — are experiencing significantly slower SSD performance compared to higher-capacity versions of the same machine. Benchmarks of the new M5 Pro and M6 Mac minis show the 256 GB configuration performs roughly half as fast throughout SSD tests, even though it beats its prior generation in both read and write speeds.
Single vs. Dual SSD Module Architecture
The disparity stems from how the storage hardware is built: 256 GB units use just one NAND module, whereas models with 512 GB or more employ two modules. The dual-module builds can operate in parallel, giving those higher capacity Macs a tangible speed edge. This isn’t a new issue — the preceding M4 Mac minis used the same single-module design, and showed similar limitations in read and write benchmarks.
Improvements But Still Lagging
Although the 256 GB version remains the slowest among current configurations, Apple has improved its performance over the last generation. In testing, the newest 256 GB M6 Mac mini writes data at around 3,000 MB/s — a jump from the M4’s ~2,014 MB/s (improvement of nearly 49 percent). Read speeds also rose by ~16 percent: the M6’s 256 GB model reached about 3,216 MB/s, up from ~2,792 MB/s in its predecessor.
That said, compared to other Mac minis outfitted with 512 GB or more of storage, those dual‐module setups still offer much faster throughput, especially for tasks that push heavy I/O like video editing, virtual machines, or moving large data sets.
On price, the 256 GB M6 Mac mini starts at $899, while upgrading to a 512 GB SSD raises the cost to $1,099. These are relatively steeper prices compared to older models, but the overall performance of the new Mac minis represents a strong generational leap.
In short, users choosing the base storage model are trading speed, particularly in disk-intensive workflows, for cost. The improvements are real compared to past models, but the gap between base and upgraded storage is wider than many might expect.
What to Watch: For those who rely on fast SSDs, spending more for a higher capacity model now looks more than just a convenience — it’s a functional necessity. Watch future benchmark reports for 512 GB and 1 TB models to see exactly how much the dual-module design delivers in real-world use.
