The Most Expensive iPhone Pros Might be the Slowest Ones

While the 256GB and 512GB variants employ faster TLC storage, apple's iPhone 18 Pro and iPhone 18 Pro Max models with 1TB and 2TB storage options are reportedly using slower QLC flash memory.

Key points

• The iPhone 18 Pro and iPhone 18 Pro Max are available in four storage configurations: 256GB, 512GB, 1TB, and 2TB.
• The iPhone 17 Pro and iPhone 17 Pro Max reportedly applied TLC storage even in their 1TB and 2TB variants.
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• According to testing, the 256GB and 512GB models employ TLC flash memory, where each memory cell stores three bits of data.
• Testing indicated that the SLC cache reached write speeds of up to 3, 000MB/s.

In practice, the iPhone 18 Pro and iPhone 18 Pro Max are available in four storage configurations: 256GB, 512GB, 1TB, and 2TB.

According to testing, the 256GB and 512GB models employ TLC flash memory, where each memory cell stores three bits of data. Meanwhile, the higher-end 1TB and 2TB models reportedly employ QLC storage. It stores four bits per cell.

QLC storage offers higher capacity at a lower cost but is generally slower compared with TLC memory. IPhone 18 Pro Can Run Massive 27B AI Model On-Device.

To improve performance, Apple reportedly uses multiple storage layers in the QLC models. The system first writes data to a faster SLC cache, then moves to TLC cache before reaching the slower QLC storage.

Testing indicated that the SLC cache reached write speeds of up to 3, 000MB/s. After the cache filled, speeds dropped to around 578MB/s when using TLC cache.

Once both caches were full, the phone switched to QLC storage, where write speeds dropped to around 79.4MB/s, with some measurements falling as low as 25.6MB/s. Performance Drops as Storage Fills Up.

In practice, the tests were conducted on devices with empty storage, where the SLC cache was around 250GB. Nevertheless, the available cache size declined as storage usage rose.

At around 60% storage usage, the SLC cache dropped to 58GB. While QLC storage performance dropped significantly to around 1.1MB/s during sustained writes, at the same point, TLC cache speeds fell to around 396MB/s. Random Read Performance Additionally Affected.

Notably, the testing additionally demonstrated differences in random storage performance. The 1TB iPhone 18 Pro Max with QLC storage was around 38% slower in 4K random reads compared with the 512GB TLC model at low queue depths.

Under heavier workloads with multiple processes accessing storage simultaneously, the performance gap reduced to around 12%, but the QLC model remained slower. Meta Targets Apple Vision Pro with Much Cheaper Ultra-Light VR Glasses. IPhone 17 Pro Models Applied TLC Storage.

Traditionally, higher-capacity flash storage can offer better performance since more memory chips can share workloads. Nevertheless, this advantage depends on the type of NAND memory being employed.

While SLC storage delivers the highest performance, TLC and QLC reduce costs by storing more data per cell, with a trade-off in speed and endurance.

For context, the iPhone 17 Pro and iPhone 17 Pro Max reportedly applied TLC storage even in their 1TB and 2TB variants. The documented shift to QLC storage in higher-capacity iPhone 18 Pro models comes as memory costs have rose significantly.

As current results are based on synthetic tests rather than everyday usage, the real-world impact of the storage change remains unclear. Stay Connected with ProPakistani.

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In short, the Most Expensive iPhone Pros Might be the Slowest Ones is the central thread here, and readers can expect follow-up reporting as the picture becomes clearer.