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Apacer Endurance NAS PPSS25 256 GB

256 GB
Capacity
Phison S11
Controller
TLC
Flash
SATA 6 Gbps
Interface
2.5"
Form Factor
Front
SSD Controller
Controller
The Apacer Endurance NAS PPSS25 is a solid-state drive in the 2.5" form factor, launched in 2022. It is available in capacities ranging from 256 GB to 512 GB. This page reports specifications for the 256 GB variant. With the rest of the system, the Apacer Endurance NAS PPSS25 interfaces using a SATA 6 Gbps connection. The SSD controller is the PS3111-S11-13 from Phison, a DRAM cache is not available. Apacer has installed 112-layer TLC NAND flash on the Endurance NAS PPSS25, the flash chips are made by Kioxia. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are soaked up more quickly. The Endurance NAS PPSS25 is rated for sequential read speeds of up to 560 MB/s and 485 MB/s write; random IOPS reach up to 87K for reads and 27K for writes.
At its launch, the SSD was priced at 41 USD. The warranty length is set to five years, which is an excellent warranty period. Apacer guarantees an endurance rating of 385 TBW, a good value.

Solid-State-Drive

Capacity: 256 GB
Variants: 256 GB 512 GB
Overprovisioning: 17.6 GB / 7.4 %
Production: Active
Released: 2022
Price at Launch: 41 USD
Part Number: AP256GPPSS25-R
Market: Consumer

Physical

Form Factor: 2.5"
Interface: SATA 6 Gbps
Protocol: AHCI
Power Draw: Unknown

Controller

Manufacturer: Phison
Name: PS3111-S11-13
Architecture: ARM 32-bit
Core Count: Single-Core
Frequency: 200 MHz
Foundry: UMC
Process: 40 nm
Flash Channels: 2 @ 533 MT/s
Chip Enables: 8

NAND Flash

Manufacturer: Kioxia
Name: BiCS5
Type: TLC
Technology: 112-layer
Speed: 1200 MT/s
Capacity: 2 chips @ 1 Tbit
Toggle: 4.0
Topology: Charge Trap
Dies per Chip: 2 dies @ 512 Gbit
Planes per Die: 2
Word Lines: 128 per NAND String
87.5% Vertical Efficiency
Read Time (tR): 56 µs
Program Time (tProg): 484 µs
Die Read Speed: 571 MB/s
Die Write Speed: 66 MB/s
Endurance:
(up to)		 3000 P/E Cycles
(100000 in SLC Mode)
Page Size: 16 KB
Block Size: 1344 Pages
Plane Size: 448 Blocks

DRAM Cache

Type: None

Performance

Sequential Read: 560 MB/s
Sequential Write: 485 MB/s
Random Read: 87,000 IOPS
Random Write: 27,000 IOPS
Endurance: 385 TBW
Warranty: 5 Years
MTBF: 2.0 Million Hours
Drive Writes Per Day (DWPD): 0.8
SLC Write Cache: Yes

Features

TRIM: Yes
SMART: Yes
Power Loss Protection: No
Encryption:
  • Unknown
RGB Lighting: No
PS5 Compatible: No

Notes

Controller:

In order to improve performance, Phison implemented a way that the controller utilizes it's internal 32 MiB of SRAM as some kind of "Pit-stop" that is allocated for incoming Write request in order to improve performance since it's a very quick to access and fast RAM. This implementation was called Smart Cache Flush.
This SmartCacheFlush technology allows incoming data to only have a “pit stop” in the cache and then move to the NAND flash at once. If the flash is jammed due to particular file sizes (such as random 4KB data), the cache will be treated as an “organizer”, consolidating incoming data into groups before written into the flash to improve write amplification.

NAND Die:

Although this Die is a 4-plane design, most Kioxia BiCS5 NAND Dies used in most SSDs are dual planes design because of Yield and production cost.
And because of the die being dual-plane the Throughput is cut in half to 66 MB/s per die.
There is no CuA (Circuitry under Array) in the Dual-Plane variant.
Typical Endurance: 1700 ~ 3000 P.E.C.
Typ. Endurance eTLC: 5.000 ~ 7.000 P.E.C.
Dec 30th, 2024 12:24 EST change timezone

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