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Silicon Power Ace A55 1 TB

1 TB
Capacity
Phison S11
Controller
TLC
Flash
SATA 6 Gbps
Interface
2.5"
Form Factor
Front
SSD Controller
Controller
NAND Die
NAND Die
The Silicon Power Ace A55 is a solid-state drive in the 2.5" form factor, launched in 2020. It is available in capacities ranging from 128 GB to 2 TB. This page reports specifications for the 1 TB variant. With the rest of the system, the Silicon Power Ace A55 interfaces using a SATA 6 Gbps connection. The SSD controller is the PS3111-S11-13 from Phison, a DRAM cache is not available. Silicon Power has installed 96-layer TLC NAND flash on the Ace A55, the flash chips are made by Toshiba. To improve write speeds, a pseudo-SLC cache is used, so bursts of incoming writes are absorbed more quickly. The Ace A55 is rated for sequential read speeds of up to 560 MB/s and 530 MB/s write.
The SSD's price at launch is unknown. The warranty length is set to three years, which is above average, but shorter than the five years offered by many other vendors. Silicon Power guarantees an endurance rating of 500 TBW, a typical value for consumer SSDs.

Solid-State-Drive

Capacity: 1 TB (1024 GB)
Variants: 128 GB 256 GB 512 GB 1 TB 2 TB
Overprovisioning: 70.3 GB / 7.4 %
Production: Active
Released: 2020
Part Number: Unknown
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
Chip Enables: 8

NAND Flash

Manufacturer: Toshiba
Name: BiCS4
Type: TLC
Technology: 96-layer
Speed: 800 MT/s
Capacity: Unknown
ONFI: 4.0
Toggle: 3.0
Topology: Charge Trap
Process: 19 nm
Die Size: 86 mm²
(6.0 Gbit/mm²)
Planes per Die: 2
Decks per Die: 2
Word Lines: 109 per NAND String
88.1% Vertical Efficiency
Read Time (tR): 58 µs
Program Time (tProg): 561 µs
Die Read Speed: 551 MB/s
Die Write Speed: 57 MB/s
Endurance:
(up to)		 3000 P/E Cycles
(30000 in SLC Mode)
Page Size: 16 KB
Block Size: 1152 Pages
Plane Size: 1822 Blocks

DRAM Cache

Type: None

Performance

Sequential Read: 560 MB/s
Sequential Write: 530 MB/s
Random Read: Unknown
Random Write: Unknown
Endurance: 500 TBW
Warranty: 3 Years
MTBF: 1.5 Million Hours
Drive Writes Per Day (DWPD): 0.4
SLC Write Cache: Yes

Features

TRIM: Yes
SMART: Yes
Power Loss Protection: No
Encryption:
  • No
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:

Read latency tR: 58 µs (ABL)
tPROG with ~ 25% Overhead: ~ 750 µs (Avg - 42.7 MB/s per each die)
May 17th, 2024 11:38 EDT change timezone

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