In the worst-case scenario, the most expensive iPhone of the year can write data slower than an old hard drive. The reason is denser QLC storage: more gigabytes in the same space, but lower write speeds.
⏺ Higher-capacity models use QLC 4 bits per cell instead of 3 with TLC. More capacity, lower speed.
🟡 While the fast cache is active, write speeds can reach ~3,000 MB/s. Once the cache is exhausted, speeds can drop to ~79 MB/s, with some dips to 25 MB/s.
🟡 At 60% storage usage, the cache reportedly shrinks from 250 GB to 58 GB. Average write speed drops to 45 MB/s, with some dips as low as 1.1 MB/s.
⏺ In one test, the 1TB Pro Max with QLC was 38% slower than the 512GB Pro with TLC.
Bottom line:
More storage doesn't always mean more speed. For messaging, photos and gaming, most users probably won't notice the difference, and testers describe these results as a worst-case scenario. But for people shooting lots of 4K and ProRes, the maximum-capacity model deserves a second look.
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