Side by side
Compare storage performance
Choose two Models, then select Compare. You can compare different storage capacities.
Select a benchmark configuration
Choose Model B
Each option includes its storage capacity. Select one to add it to your comparison.
Models with the most samples
Your comparison
Storage performance
Sequential read
MiB/s · higher is fasterB is 0.25% lower than A
Sequential write
MiB/s · higher is fasterB is 66.06% lower than A
4 KiB random read
MiB/s · higher is fasterB is 26.44% lower than A
4 KiB random write
MiB/s · higher is fasterB is 4.12% higher than A
Configuration details
| Detail | A · NVMe SAMSUNG MZVLB256 SCSI Disk Device · 238 GB | B · PM991a NVMe Samsung 512GB · 476 GB |
|---|---|---|
| Platform | Windows | Windows |
| Sample count | 1 | 3 |
| Latest measurement | 2026-04-11 | 2023-08-29 |
| Random read IOPS | 10,024 | 7,374 |
| Random write IOPS | 15,227 | 15,854 |
| All capacities | View Model → | View Model → |
Results checked · Speeds in MiB/s · About these measurements
Four tests. A clearer comparison.
Compare sequential and 4 KiB random read/write speeds side by side. Every option includes its Model, capacity and platform. You can compare 512 GB with 256 GB, including two capacities of the same Model.