SSSTC (Kioxia) CL4 (OEM) 512 GB vs WD Black SN770 2 TB
Short answer: which is best?
SSSTC (Kioxia) CL4 (OEM) 512 GB is 5.4 % stronger than WD Black SN770 2 TB. SSSTC (Kioxia) CL4 (OEM) 512 GB ranks #35 of 54 measured system drives at WhatFPS (7,571 Drive score over 1 verified runs). WD Black SN770 2 TB ranks #40 of 54 measured system drives at WhatFPS (7,184 Drive score over 1 verified runs). The numbers are measured in 2 verified WhatFPS runs — not estimated, not self-reported.
Measured comparison
| Metric | SSSTC (Kioxia) CL4 (OEM) 512 GB | WD Black SN770 2 TB |
|---|---|---|
| Drive score (the drive's own performance: sequential read + 4K IOPS) | 7,571 | 7,184 |
| Best rig (GAMING — whole PC) | 880 | 7,545 |
| Sequential read | 2,462 MB/s | 1,525 MB/s |
| 4K IOPS | 8,171 | 11,878 |
| 4K latency, median (lower is better) | 98 µs | 78 µs |
| Type | NVMe SSD | NVMe SSD |
| Size | 512 GB | 2 TB |
What the numbers mean
The drive score is the system drive's measured performance in the rigs it sat in — sequential read and 4K IOPS, unbuffered. PCIe generation, fill level and driver affect it. GAMING is the whole rig's score. We show both and never mix them.
All numbers come from our benchmark suite, the same test on every PC, written in Rust with no middleware. The methodology is open at https://whatfps.com/metodik
All measurements for SSSTC (Kioxia) CL4 (OEM) 512 GB · All measurements for WD Black SN770 2 TB