ZHITAI Ti600s Review: A QLC SSD That Balances Speed and Power
YMTC’s ZHITAI Ti600s is the successor to the company’s Ti600 consumer PCIe 4.0 QLC SSD, bringing a substantial performance and efficiency upgrade under a familiar product name.
Officially launched on August 18, 2026, the Ti600s combines YMTC’s latest-generation Xtacking 4.0 QLC NAND with an optimized controller and SLC caching architecture. The result is a drive rated for up to 7,400 MB/s sequential read, 6,900 MB/s sequential write, 1.3 million random-read IOPS, and 1.5 million random-write IOPS.
The 2TB model tested here goes even further in several benchmarks, reaching more than 7,450 MB/s sequential read, nearly 6,900 MB/s sequential write, and more than 1.6 million random-write IOPS.
More importantly, the Ti600s combines this level of PCIe 4.0 performance with relatively low active power consumption, making it an interesting example of how modern QLC technology can address both capacity and energy efficiency.
🚀 Ti600s Hardware and Feature Overview #
The Ti600s is available in four capacities:
- 512GB
- 1TB
- 2TB
- 4TB
All versions use the standard M.2 2280 form factor, allowing the drive to fit conventional desktop motherboards, laptops, and other compatible systems.
The tested 2TB model uses YMTC’s latest QLC flash architecture and a DRAM-less design.
Key specifications include:
- PCIe 4.0 NVMe interface
- M.2 2280 form factor
- YMTC Xtacking 4.0 QLC NAND
- 3,600 MT/s NAND interface rate
- 8-plane NAND architecture
- DRAM-less controller design
- Full-drive SLC caching
- Up to 7,400 MB/s sequential read
- Up to 6,900 MB/s sequential write
- Up to 1,300K random-read IOPS
- Up to 1,500K random-write IOPS
The 8-plane architecture significantly increases internal NAND throughput, with the manufacturer citing a 147% throughput improvement over its previous-generation QLC implementation.
💾 Large SLC Cache in a DRAM-Less Design #
One of the more notable aspects of the Ti600s is its DRAM-less architecture combined with full-drive SLC caching.
On the 2TB model, approximately 530GB of SLC cache is available when the drive is empty.
This allows short-duration write workloads to operate at substantially higher speeds than the underlying QLC NAND could sustain directly.
Once the cache is exhausted, write performance falls considerably, with the tested post-cache write rate reported at roughly 200–300 MB/s.
That behavior is important when evaluating a QLC SSD. Peak benchmark results can represent cache-assisted performance, while sustained workloads that exceed the available cache can behave very differently.
The Ti600s therefore benefits from particularly strong burst performance, but workloads involving very large continuous writes should be evaluated separately from short benchmark runs.
🧪 Testing Methodology #
The evaluation uses eBird, a professional SSD testing and validation platform developed by Luanqi Technology.
The platform covers testing from NVMe protocol behavior to system-level applications and includes specialized capabilities for SSD development, validation, and enterprise acceptance.
Its testing areas include:
- NVMe protocol validation
- System application testing
- Power-loss testing
- PCIe link-layer testing
- Secondary development interfaces
- Power measurement
- Trace logging
- NVMe-MI
- ZNS
- TCG
- SR-IOV
- DualPort
The Ti600s evaluation combines protocol compliance testing with performance and power-consumption measurements.
✅ 619 NVMe and IOL Tests All Passed #
The protocol evaluation covered both NVM and Admin command categories.
NVM Command Testing #
eBird provided 101 NVM command test scripts, and all 101 passed.
Admin Command Testing #
A further 319 Admin command test scripts were executed, with every test passing.
IOL Testing #
The evaluation also included 219 interoperability tests based on IOL specifications.
All 219 tests passed.
Across the three categories, the Ti600s completed 619 test scripts with a 100% pass rate.
This provides strong evidence of protocol-level compliance within the tested environment.
📊 CrystalDiskMark Performance #
CrystalDiskMark produced some of the strongest results in the evaluation.
The 2TB Ti600s achieved approximately:
- 7,456 MB/s sequential read
- 6,915 MB/s sequential write
- 1,373K random-read IOPS
- 1,619K random-write IOPS
These results exceed the official specifications of 7,400 MB/s read, 6,800 MB/s write, 1,300K random-read IOPS, and 1,500K random-write IOPS cited for the tested configuration.
The results demonstrate that the Ti600s is capable of pushing PCIe 4.0 bandwidth close to the practical limits of the interface while also delivering unusually high random-write performance for a consumer QLC SSD.
📈 SNIA Testing Shows Steady-State Behavior #
Short benchmark bursts do not tell the entire story for a QLC SSD, particularly when SLC caching is involved.
To investigate longer-term behavior, the Ti600s was also tested using the SNIA methodology through eBird.
Unlike short cache-assisted benchmarks, these measurements were performed during the QLC steady-state phase rather than the initial pseudo-SLC/TLC write phase.
The drive produced approximately 94K IOPS under 4K random-read steady-state workloads and maintained consistent behavior across commonly tested block sizes, including:
- 4K
- 8K
- 16K
- 32K
This type of testing provides a more realistic picture of sustained behavior after the drive has been heavily used or filled to a higher capacity.
For everyday workloads such as operating-system access, application loading, game reads, media previews, and multitasking, steady-state random performance can be more representative than short-lived peak cache results.
🖥️ PCMark 10 and 3DMark Results #
The Ti600s also performed strongly in application-oriented storage benchmarks.
In PCMark 10’s Full System Drive Benchmark, the 2TB drive scored more than 10,000 points.
That result is notable because the Ti600s uses QLC NAND rather than TLC, yet its overall application-level performance was competitive with a number of TLC-based SSDs in the tested workloads.
The drive was also evaluated as a data drive in 3DMark’s Storage Benchmark, which simulates storage activity associated with gaming.
The Ti600s approached 5,000 points, indicating strong performance under gaming-oriented storage workloads.
These results reinforce the distinction between NAND type and overall SSD performance: controller behavior, firmware, caching, NAND architecture, and interface bandwidth can all substantially affect real-world performance.
⚡ Active Power Consumption Is a Major Strength #
The Ti600s becomes particularly interesting when performance is considered alongside power consumption.
During high-speed sequential workloads, the drive reportedly reached:
- Approximately 7,458 MB/s sequential read
- Approximately 6,914 MB/s sequential write
- 4.42W instantaneous read power
- 4.31W instantaneous write power
Across the broader full-load testing, peak power remained within approximately 4.19W to 5.68W, while average power consumption ranged from approximately 3.92W to 4.88W depending on workload.
For a PCIe 4.0 QLC SSD operating at more than 7 GB/s, these figures highlight the importance of controller and NAND efficiency.
Performance Per Watt #
Looking at power consumption relative to throughput provides another useful perspective.
The Ti600s can sustain very high sequential bandwidth without requiring the kind of power budget often associated with high-performance NVMe drives.
That has practical implications for systems where thermal and power constraints matter, particularly laptops and compact desktops.
💻 Lower Power Can Benefit Mobile Systems #
High-performance NVMe SSDs can become significant sources of heat inside thin laptops because the controller and NAND must dissipate the electrical power consumed during sustained transfers.
The Ti600s’ relatively restrained active power profile can reduce the thermal burden on the system.
For laptops and other compact devices, that can potentially help with:
- Lower SSD temperatures
- Reduced thermal throttling risk
- Less heat accumulation
- Lower system power consumption
- More efficient sustained transfers
Actual thermal behavior will still depend on the host system, airflow, SSD heatsink, workload, and ambient temperature.
🗄️ High-Capacity Storage Without Excessive Power #
The combination of QLC density and PCIe 4.0 performance also makes the Ti600s suitable for high-capacity storage applications.
A 2TB or 4TB QLC SSD can provide substantial storage capacity without requiring the physical space of multiple smaller drives.
Potential use cases include:
- Game libraries
- Video and media storage
- Content-creation workstations
- Large application installations
- Secondary desktop storage
- Laptop upgrades
- Selected NAS or cache applications
For workloads dominated by reads or moderate write bursts, the Ti600s’ combination of capacity, bandwidth, and power efficiency is particularly relevant.
However, sustained write-heavy workloads that exceed the SLC cache should be evaluated carefully because QLC write performance can fall significantly after the cache is exhausted.
🌙 Standby Power Drops to Milliwatt Levels #
The Ti600s also demonstrates very low consumption in its lower-power states.
Average measurements reported for the 2TB model include:
- PS3: 2.37 mW
- PS4: 1.45 mW
- Modern Standby: 1.43 mW
- OS Idle: 36.62 mW
PS4 and Modern Standby both remain below 1.5 mW in the reported measurements.
This is particularly useful for mobile systems because the SSD can spend substantial amounts of time in low-power states during everyday use.
The low idle and standby figures can reduce unnecessary battery drain when a laptop is inactive, sleeping, or operating under light workloads.
🔋 Efficiency Extends Beyond Peak Performance #
Power efficiency is often discussed primarily in terms of watts under load, but idle and sleep behavior can have a major impact on devices that spend more time waiting than transferring data.
The Ti600s combines relatively low active power with very low deep-idle consumption.
This gives the drive two distinct efficiency characteristics:
Under load: High throughput without excessive power draw.
At idle: Rapid transition into low-power states with milliwatt-level consumption.
That combination is especially relevant for laptops, where both performance and battery life matter.
🧠 QLC Performance Has Changed Significantly #
QLC NAND stores four bits per cell, allowing manufacturers to achieve greater storage density than TLC NAND.
The trade-off has traditionally involved lower write endurance, more complicated programming behavior, and potentially lower sustained write performance.
Modern SSD designs can mitigate some of these limitations through improvements in NAND architecture, controllers, firmware, caching, and power management.
The Ti600s is a useful example of that evolution.
Its headline sequential speeds approach the practical limits of PCIe 4.0, while its random performance is substantially higher than that of its predecessor.
At the same time, the measured power consumption remains relatively low for the performance class.
📋 Ti600 vs. Ti600s: A Major Generational Step #
Compared with the previous Ti600, the Ti600s significantly raises its random-access performance.
According to the supplied specifications, the new model improves:
- Random read IOPS by approximately 44%
- Random write IOPS by approximately 114%
Sequential performance also reaches a level that is close to the practical ceiling of PCIe 4.0.
The improvements appear to come from the combined evolution of:
- Xtacking 4.0 QLC NAND
- Higher NAND interface speed
- Eight-plane architecture
- Controller optimization
- Firmware improvements
- SLC caching strategy
This is why the Ti600s represents more than a simple capacity-focused QLC refresh.
🏁 Conclusion: A Fast and Efficient QLC Gen4 SSD #
Testing of the ZHITAI Ti600s 2TB shows a drive that combines high PCIe 4.0 performance with unusually controlled power consumption.
The measured sequential performance exceeds 7,400 MB/s read and approaches 6,900 MB/s write, while random performance reaches more than 1.6 million write IOPS in the supplied benchmark results.
At full load, reported peak power remains approximately within the 4.19W–5.68W range, while average consumption stays around 3.92W–4.88W depending on the workload.
The drive also passed all 619 NVMe and interoperability test scripts included in the evaluation.
The most interesting aspect of the Ti600s is therefore not simply its benchmark speed. Its combination of QLC density, PCIe 4.0 bandwidth, strong random performance, and low power consumption demonstrates how far consumer QLC SSDs have progressed.
The large SLC cache makes the Ti600s particularly effective for burst-oriented workloads, while its steady-state results provide a more realistic view of performance after extended use. Sustained write-heavy workloads remain an area where QLC behavior must be considered carefully.
For users prioritizing high capacity, fast everyday performance, and low power consumption, the Ti600s presents a compelling technical package. Its results also show that modern QLC SSDs can compete strongly in many consumer workloads while delivering the storage density and efficiency advantages that make the technology attractive for high-capacity systems.