For a server boot drive, the Intel DC S3500 is the better-supported choice on paper; for a ZFS SLOG, neither drive should be selected on headline speed or endurance alone. Intel documents enhanced power-loss data protection and positions the S3500 for data-center use. Kingston’s HyperX 3K datasheet, by contrast, says it is intended for desktop and notebook workloads, not servers. That makes the S3500 the more defensible candidate for server evaluation—but there is no controlled S3500-versus-HyperX ZFS benchmark here, so it is not a proven performance winner.
“Kingston HyperX” covers multiple generations. The Kingston figures below apply specifically to the HyperX 3K family, part number SH103S3, not HyperX Savage or another model.
What the specifications say
Both families use SATA 3.0, but their manufacturer documents describe different roles and do not provide a directly comparable performance test.
| Specification | Intel DC S3500 | Kingston HyperX 3K (SH103S3) |
|---|---|---|
| Form factor | 2.5-inch and 1.8-inch family options | 2.5-inch |
| Capacities in cited specification | 2.5-inch models from 80 GB to 800 GB; 1.8-inch capacities are listed separately | 120 GB, 240 GB, and 480 GB |
| Rated endurance | 45 TBW at 80 GB; 70 TBW at 120 GB; 275 TBW at 480 GB; 450 TBW at 800 GB. Intel bases its rating on JESD218. | 290 TBW at 120 GB; 765 TBW at 240 GB; 1,785 TBW at 480 GB. Kingston says its TBW figures derive from JEDEC JESD219A. |
| Power-loss protection documented | Intel lists “Enhanced power-loss data protection.” | The cited datasheet lists SMART, TRIM, and garbage collection, but does not list hardware power-loss protection. |
| Workload positioning | Data-center product family | Kingston says desktop and notebook workloads; it is “not intended for server environments.” |
Sources: Intel DC S3500 product specification and Kingston HyperX 3K datasheet. TBW figures are manufacturer ratings from different test bases, not independent head-to-head results or estimates of the remaining life of a used drive.
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Peak performance is not a SLOG comparison
Intel specifies up to 75,000 random 4 KB reads and up to 11,500 random 4 KB writes for the S3500 family; the figures vary by capacity and form factor and reflect Intel’s test conditions. Kingston lists sequential read/write speeds up to 555/510 MB/s for the 120 GB and 240 GB HyperX 3K models, and up to 540/450 MB/s for the 480 GB model. Kingston notes that performance may vary with host hardware, software, and usage.
These vendor figures use different workloads and methods. Sequential throughput does not establish how either drive will behave under synchronous writes, and the available specifications do not establish which drive has lower or more consistent ZFS SLOG latency.
Is the S3500 a better boot drive than a HyperX SSD?
If the choice is between an S3500 and a HyperX 3K for a server boot device, the S3500 has the stronger documented fit because Intel describes a data-center drive and lists power-loss data protection. Kingston explicitly excludes server environments from the HyperX 3K’s intended use. That is a difference in product positioning and documented features, not a guarantee that any used S3500 will be healthy or compatible with your system.
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- 3.84TB enterprise SATA solid state drive in a 2.5-inch form factor — ideal for read-intensive server and data center workloads including virtualization, content delivery, and database read replicas
- SATA 6Gb/s interface with sequential read speeds up to 555 MB/s and sequential write speeds up to 530 MB/s for consistent, high-throughput data access
- 3D TLC NAND flash with 1 Drive Write Per Day (DWPD) endurance rating and 7,008 TBW total write endurance over a standard 5-year period
- 96,000 random read IOPS and 35,000 random write IOPS with enterprise-grade power loss protection and error correcting code for data integrity in mission-critical environments
- Dual Dell/SK Hynix label (Dell DPN 03GDK0) — fully compatible with any system supporting a standard SATA interface, not limited to Dell systems; 2,000,000-hour MTBF reliability rating
For boot duty, check these points before choosing:
- Exact model and fit: Confirm whether the S3500 is 2.5-inch or 1.8-inch, along with connector, mounting, controller, and operating-system support. The cited documents do not verify compatibility with a particular server or boot configuration.
- Capacity: Make sure the exact model has enough usable space for the operating system, updates, logs, and any additional boot-disk requirements.
- Recoverability: Decide how you will restore service if the boot SSD fails—through tested backups, mirrored boot media, or another recovery plan.
- Condition of a used unit: Check its health indicators and write counters. The published TBW rating is not a reading of remaining life; neither specification says anything about the condition of an individual secondhand drive.
Can you use an Intel DC S3500 or Kingston HyperX as a ZFS SLOG?
Possibly, but the decision depends on your synchronous-write workload and the specific drive’s behavior. A SLOG is relevant when applications issue synchronous writes; adding one without a measured bottleneck is not automatically useful. OpenZFS treats SLOG selection as workload-sensitive and notes that write-oriented use can make some SSDs poor candidates.
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- Confirm synchronous writes are part of the workload. If they are not, a separate SLOG may not address the problem you are trying to solve.
- Measure before changing hardware. Establish whether synchronous-write latency is a real bottleneck and whether a separate log device improves the relevant workload.
- Compare sustained latency and consistency. Peak sequential throughput figures do not answer how the SSD responds to the actual write pattern.
- Check endurance against that write pattern. Match the exact drive capacity and its rated endurance to expected writes; do not treat a family-wide figure as applying to every model.
- Verify power-failure behavior and host compatibility. Review documented protection and test the complete drive, controller, and system configuration rather than assuming a feature label covers every failure scenario.
How the two candidates compare for SLOG use
The S3500 is the more defensible of these two candidates for evaluation: Intel documents enhanced power-loss data protection, and OpenZFS includes the S3500 family in its hardware discussion. Kingston’s HyperX 3K is a less suitable server candidate on the available documentation because Kingston says it is not intended for server environments and does not list equivalent hardware PLP in the cited datasheet.
That documentation difference does not prove the exact power-loss behavior of every HyperX unit, nor does it establish that an S3500 will perform well in your pool. The available material contains no measured SLOG latency, specific controller or firmware behavior, or controlled ZFS comparison. See OpenZFS hardware guidance for the broader workload-sensitive selection context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What to consider when buying an older drive
These documents establish manufacturer specifications, not present-day availability, price, or the condition of any listing. An old enterprise SSD still needs checks at the individual-unit level.
- Confirm the exact model, capacity, and form factor on the drive label and in device-reported data.
- Review SMART health information and total writes for the specific unit before trusting it with boot or logging duties.
- Check that the drive is recognized by the intended controller and firmware configuration.
- For SLOG use, validate behavior with the intended pool and workload, including the consequences of a sudden power interruption.
For a newer category reference, Kingston describes its DC600M Series as a mixed-use data-center SATA SSD with hardware-based power-loss protection and published endurance. That description may help identify the sort of documentation to look for in a server SSD; it is not evidence of a like-for-like performance result against the S3500 or HyperX 3K.
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