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Intel 660p 2TB vs Kingston A400 120GB Comparison

Comparison

Intel 660p 2TB vs Kingston A400 120GB Comparison

The Intel 660p Series 2TB is a high-capacity M.2 NVMe SSD aimed at fast, read-heavy storage, while the Kingston A400 120GB is a compact SATA SSD designed for affordable operating-system upgrades. The Kingston has the higher overall score, but the Intel is the clear fit for buyers who need vastly more capacity and have a compatible NVMe slot.

Expert tested Data driven Unbiased reviews Updated 2 August 2026
Intel 660p Series 2TB

#1 Overall Winner

Intel 660p Series 2TB

79/100
  • Large 2TB capacity for game libraries, media, and general file storage.
View review
Kingston A400 120GB

Contender

Kingston A400 120GB

85/100
  • Simple 2.5-inch SATA upgrade path for many older laptops and desktops.
View review

Quick verdict

Choose the Intel 660p Series 2TB for a compatible M.2 NVMe PC, a large game library, and high-capacity file storage. Choose the Kingston A400 120GB for an uncomplicated 2.5-inch SATA boot-drive upgrade where a small operating-system drive is sufficient. The Kingston wins the supplied overall scoring; the Intel wins decisively on capacity and rated sequential throughput.

Overall winner

Depends on your needs

At-a-glance comparison

Feature Intel 660p Series 2TB Kingston A400 120GB Winner

Overall assessment

Overall score: 79

Overall score: 85

Kingston A400 120GB

Capacity

2TB

120GB

Intel 660p Series 2TB

Interface and form factor

M.2 2280 PCIe NVMe 3.0 x4

2.5-inch SATA 6Gb/s

Depends

Rated sequential read

Up to 1,800 MB/s

Up to 500 MB/s

Intel 660p Series 2TB

Rated sequential write

Up to 1,800 MB/s

Up to 450 MB/s

Intel 660p Series 2TB

Everyday performance score

78

86

Kingston A400 120GB

Speed score

76

90

Kingston A400 120GB

Ease of setup

84

93

Kingston A400 120GB

Reliability score

70

72

Kingston A400 120GB

Durability score

66

71

Kingston A400 120GB

Value score

89

90

Kingston A400 120GB

Customer satisfaction

4.8/5 from 2,737 reviews; score 91

4.7/5 from 28,572 reviews; score 94

Kingston A400 120GB

Detailed comparison

Performance

The Intel has the higher rated sequential performance ceiling, with up to 1,800 MB/s reads and writes versus the Kingston's 500 MB/s read and 450 MB/s write ratings. In suitable NVMe systems, that gives the Intel a clear advantage for loading and moving data in short to moderate bursts. However, reviews repeatedly identify the Intel's QLC cache behavior as a constraint: prolonged large writes can become much slower after the SLC cache fills. The Kingston's SATA interface is inherently slower, but its performance is widely praised as a meaningful upgrade from a hard disk for booting, loading, and ordinary desktop use. The higher provided performance score belongs to Kingston, so its evaluated everyday result is stronger despite the lower specification ceiling.

Speed

Specification speed favors the Intel: it is rated for up to 1,800 MB/s sequential reads and writes, compared with Kingston's up to 500 MB/s reads and 450 MB/s writes. Yet the supplied speed score favors Kingston, 90 to 76. This reflects the Intel's reported sustained-write weakness after its SLC cache fills. For light boot, loading, and everyday tasks, both are major upgrades over a mechanical drive; for high-capacity NVMe reads and shorter transfers, Intel has the stronger interface advantage.

Reliability

Neither drive has unqualified reliability evidence in the provided data. The Intel receives a reliability score of 70, with reviews praising its operation but also raising QLC endurance concerns and occasional reports that it may not last. The Kingston edges it at 72 and has many reports of drives working well, including longer use, but its review summary also includes failures in less than six months. For either model, maintain backups rather than treating an SSD as the only copy of important data.

Intel 660p Series 2TB

Pros

  • Large 2TB capacity for game libraries, media, and general file storage.
  • PCIe NVMe 3.0 x4 interface with rated sequential reads and writes of up to 1,800 MB/s .
  • M.2 2280 format keeps the installation compact in compatible desktops and laptops.
  • Strong value score and positive feedback for read-focused storage and gaming use.
  • High customer rating from 2,737 reviews, with repeated praise for simple installation.
  • Intel brand confidence and an available SSD Toolbox mentioned in reviews.

Cons

  • QLC NAND is less suited to sustained, write-heavy workloads than a drive designed for higher endurance.
  • Reviews report substantial write-speed reductions after the SLC cache is filled.
  • Its real-world speed depends on the host system providing a compatible M.2 PCIe NVMe connection and sufficient PCIe bandwidth.
  • Some reviewers report heat under load and suggest a heatsink in demanding installations.
  • Reliability feedback is mixed, with concerns about long-term endurance in write-intensive use.
  • It is not the strongest choice for frequent very large file transfers, databases, or heavy media-editing writes.
Intel 660p Series 2TB

Kingston A400 120GB

Pros

  • Simple 2.5-inch SATA upgrade path for many older laptops and desktops.
  • Rated for up to 500 MB/s read and 450 MB/s write , a substantial step up from a mechanical hard drive.
  • Very strong usability and setup scores, supported by frequent reports of easy installation and quick booting.
  • Small, light, silent solid-state design with no moving parts.
  • High customer satisfaction from 28,572 reviews and a 4.7/5 rating.
  • Strong value proposition for an operating-system or essential-applications drive.

Cons

  • The 120GB capacity is restrictive for large game libraries, media collections, and extensive application installs.
  • SATA performance is far below the Intel drive's rated NVMe sequential speed.
  • Its 2.5-inch SATA form factor requires a SATA data connection and power connection rather than an M.2 slot.
  • Feature depth is limited; it is a straightforward SATA SSD without advanced connected features.
  • Some customer feedback reports failures within months, reducing confidence in long-term reliability.
  • The listed product does not include cables or mounting screws according to review feedback.
Kingston A400 120GB

Final verdict

The Kingston A400 120GB is the better overall option according to the supplied scoring, winning on overall score, everyday performance, setup, usability, value, and customer satisfaction. It is especially sensible as a straightforward SATA replacement for a mechanical boot drive in an older computer. Its major limitation is capacity: 120GB will not suit buyers with large games, media collections, or extensive software libraries.

The Intel 660p Series 2TB is the more capable choice for compatible modern systems that need a large NVMe storage pool. It offers 2TB and much higher rated sequential speeds, making it a stronger fit for game libraries and general read-focused storage. Its QLC NAND, sustained-write slowdown reports, and mixed endurance feedback mean it is not the best match for heavy write-intensive work. Select based first on interface compatibility and storage needs, then on workload.

Overall winner

Depends on your needs

Frequently asked questions

<p>Which is better overall, the Intel 660p Series 2TB or Kingston A400 120GB?</p>

The Kingston A400 has the higher overall score, driven by stronger usability, setup, speed, value, and customer-satisfaction results. However, it is only a 120GB SATA drive. The Intel 660p is the more practical option when 2TB capacity and an NVMe M.2 interface are the priority, especially for read-heavy game and media storage.

<p>Which SSD is faster?</p>

On a compatible PCIe NVMe 3.0 x4 system, the Intel 660p has much higher rated sequential throughput: up to 1,800 MB/s for reads and writes, compared with the Kingston A400's 500 MB/s read and 450 MB/s write ratings. The Intel can slow significantly during sustained writes once its cache is exhausted.

<p>Which drive is better for an old laptop?</p>

The Kingston A400 is usually the more straightforward fit for an older laptop that has a 2.5-inch SATA bay. Its reviews repeatedly describe easy upgrades and noticeably faster booting. Choose the Intel only if the laptop specifically supports an M.2 2280 PCIe NVMe drive; an M.2 SATA slot alone is not the same requirement.

<p>Is the Intel 660p 2TB good for gaming?</p>

Yes, the provided reviews consistently position the Intel 660p as a strong fit for large game libraries. Its 2TB capacity and NVMe read performance are useful for storing games, and reviewers praise its value in this read-focused role. It is less appropriate for workloads involving frequent, very large sustained writes.

<p>Is 120GB enough for the Kingston A400?</p>

It can be enough for an operating system, essential applications, and cloud-focused use, which aligns with reviewer feedback. It is far less suitable for a large game library, extensive media files, or many installed applications. Check the space needed by Windows or your preferred operating system, updates, applications, and personal files before choosing 120GB.

<p>Which SSD is easier to install?</p>

The Kingston A400 scores higher for setup and usability, and customers frequently report that it works immediately in compatible SATA systems. The Intel 660p is also often described as easy to install, but buyers must verify an M-key M.2 2280 PCIe NVMe slot and may need to initialize and format the drive in the operating system.

<p>Which SSD is better for sustained file transfers?</p>

Neither listed drive is an ideal choice for demanding sustained-write work based on the available information. The Intel can deliver fast initial transfers but has repeated reports of sharp slowdowns after its SLC cache fills. The Kingston has lower SATA-rated speeds but does not have the Intel's cited cache-exhaustion concern in the provided reviews.

<p>Are these SSDs compatible with the same computers?</p>

No. The Intel 660p requires a compatible M.2 2280 PCIe NVMe connection. The Kingston A400 requires a 2.5-inch SATA bay with SATA data and power connections. Before buying either drive, confirm the physical bay or slot, interface type, and available mounting hardware in the computer.

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