Silicon Power has two similar SATA III 2.5″ internal solid state drives with the A55 and S55. So, which one of these two models best fit your needs? You can find out in this comparison guide between the SP SSDs.
The main difference between the Silicon Power A55 and Silicon Power S55 is that the A55 offers slightly bigger capacity options. The A55 is also the only product in this guide to provide a 2 TB option.
When it comes to performance, the two internal solid state drives have identical maximum sequential read speed and maximum sequential write speed. Both products also have the same supported features, MTBF and TBW.
Overall, we recommend the Silicon Power A55 SSD due to the slightly bigger size offerings in addition to better affordability.
If you are interested, you can purchase either product on Amazon with the following links:
- Silicon Power A55 SATA III 2.5″ 7mm Internal Solid State Drive
- Silicon Power S55 SATA III 2.5″ 7mm Internal Solid State Drive
SP A55 SATA III SSD vs. SP S55 SATA III SSD Comparison Chart
|Silicon Power A55 SATA III SSD||Silicon Power S55 SATA III SSD|
|Capacity Options||64 GB: SP064GBSS3A55S25 |
128 GB: SP128GBSS3A55S25
256 GB: SP256GBSS3A55S25
512 GB: SP512GBSS3A55S25
1 TB: SP001TBSS3A55S25
2 TB: SP002TBSS3A55S25
|60 GB: SP060GBSS3S55S25
120 GB: SP120GBSS3S55S25
240 GB: SP240GBSS3S55S25
480 GB: SP480GBSS3S55S25
960 GB: SP960GBSS3S55S25
|Weight||Max 63 grams||Max 63 grams|
|Dimensions||100.0 mm x 69.9 mm x 7.0mm||100.0 mm x 69.9 mm x 7.0mm|
|Interface||SATA III||SATA III|
|NAND||SLC Cache (SLC and 3D NAND)||SLC Cache (SLC and 3D NAND)|
|Features||Bad Block Management (BBM) |
Error Correction Code (ECC)
|Bad Block Management (BBM)
Error Correction Code (ECC)
|Maximum Sequential Read Speed (ATTO)||Up to 560 MB per second||Up to 560 MB per second|
|Maximum Sequential Read Speed (CDM)||Up to 500 MB per second||Up to 500 MB per second|
|Maximum Sequential Write Speed (ATTO)||Up to 530 MB per second||Up to 530 MB per second|
|Maximum Sequential Write Speed (CDM)||Up to 450 MB per second||Up to 450 MB per second|
|Mean Time Between Failures||1,500,000 hours||1,500,000 hours|
|Total Bytes Written||64 GB Silicon Power A55 SSD: N/A |
128 GB Silicon Power A55 SSD: 65 TB
256 GB Silicon Power A55 SSD: 125 TB
512 GB Silicon Power A55 SSD: 250 TB
1 TB Silicon Power A55 SSD: 500 TB
2 TB Silicon Power A55 SSD: 1000 TB
|60 GB Silicon Power S55 SSD: N/A
120 GB Silicon Power S55 SSD: 65 TB
240 GB Silicon Power S55 SSD: 125 TB
480 GB Silicon Power S55 SSD: 250 TB
960 GB Silicon Power S55 SSD: 500 TB
|Shock Resistance||1500G Max||1500G Max|
|Warranty||3 years or TBW||3 years or TBW|
|Pricing||Check price on Amazon.||Check price on Amazon.|
When you compare similar sizes, the A55 comes out on top (I.e. 64GB vs. 60GB, 128GB vs. 120GB, 256GB vs. 240GB, 512GB vs. 480GB and 1TB vs. 960GB). The A55 also offers a 2TB option, which the S55 has no equivalent of. You can check out the available capacity options for both products below:
Silicon Power A55:
- 64 GB: SP064GBSS3A55S25
- 128 GB: SP128GBSS3A55S25
- 256 GB: SP256GBSS3A55S25
- 512 GB: SP512GBSS3A55S25
- 1 TB: SP001TBSS3A55S25
- 2 TB: SP002TBSS3A55S25
Silicon Power S55:
- 60 GB: SP060GBSS3S55S25
- 120 GB: SP120GBSS3S55S25
- 240 GB: SP240GBSS3S55S25
- 480 GB: SP480GBSS3S55S25
- 960 GB: SP960GBSS3S55S25
The Silicon Power A55 SSD and Silicon Power S55 SSD weigh around the same as both can reach a maximum of 63 grams.
The dimensions are also identical as the two SP internal solid state drives have measurements of 100.0 mm x 69.9 mm x 7.0mm.
Both drives in this comparison guide use the SATA III interface.
For NAND, the SP A55 and SP S55 uses SLC Cache, which combines SLC with 3D NAND.
The two internal SSDs also have the same features, which you can find a list of below:
- Bad Block Management (BBM)
- Error Correction Code (ECC)
Maximum Sequential Read Speed (ATTO)
When measuring with the ATTO benchmark, the A55 and S55 have the same maximum sequential read speeds at up to 560 MB per second.
Maximum Sequential Read Speed (CDM)
When you use the CDM benchmark, the drives have the same top sequential reading speeds of up to 500 MB per second.
Maximum Sequential Write Speed (ATTO)
The two SATA III 2.5″ internal solid state drive have identical maximum sequential write speeds of up to 530 MB per second if you are using the ATTO benchmark.
Maximum Sequential Write Speed (CDM)
Furthermore, the SSDs have identical max sequential writing speeds of up to 450 MB per second if you are using the CDM benchmark.
Both products support the SP Toolbox, a software that lets run performance tests, check the amount of used space, find out how many total bytes have been written, measure the temperature of the drive and more.
Mean Time Between Failures
Mean Time Between Failures (also known as MTBF) is an estimated amount of time, in hours, regarding how long a solid state drive will remain functional between two critical hardware failures. Both the SP A55 and SP S55 have been rated with a MTBF of 1,500,000 hours.
Total Bytes Written
Total Bytes Written (also known as TBW) is a measurement of how much data can be written on an SSD during its lifetime. When you compared the similar capacities (64GB A55 with 60GB S55, 128GB A55 with the 120GB S55, 256GB A55 with 240GB S55, 512GB A55 with 480GB S55 in addition to 1TB A55 with 960GB S55), the TBWs are the same.
You can check out the Total Bytes Written specifications for both products below.
- 64 GB Silicon Power A55 SSD: N/A
- 128 GB Silicon Power A55 SSD: 65 TB
- 256 GB Silicon Power A55 SSD: 125 TB
- 512 GB Silicon Power A55 SSD: 250 TB
- 1 TB Silicon Power A55 SSD: 500 TB
- 2 TB Silicon Power A55 SSD: 1000 TB
Silicon Power S55:
- 60 GB Silicon Power S55 SSD: N/A
- 120 GB Silicon Power S55 SSD: 65 TB
- 240 GB Silicon Power S55 SSD: 125 TB
- 480 GB Silicon Power S55 SSD: 250 TB
- 960 GB Silicon Power S55 SSD: 500 TB
The A55 and S55 use the same operating voltage at 5V.
The vibration resistances are also identical at 50G.
The two solid state drives have a shock resistance rating of 1500G Max.
The Silicon Power A55 SATA III 2.5″ 7mm Internal Solid State Drive and Silicon Power S55 SATA III 2.5″ 7mm Internal Solid State Drive each have a warranty period of 3 years or earlier if you managed to surpass the aforementioned TBW.