For a budget PC upgrade, an internal M.2 NVMe SSD is usually the better choice for a boot or application drive—if your computer supports it. Choose an external SSD when portability, backups, or avoiding an internal installation matters more. There is no universal price winner: compare equal-capacity drives available in your region and confirm compatibility before buying.
Which type is better for your upgrade?
Start with what you want the SSD to do. An internal drive connects directly to the PC and is generally the more suitable option for running the operating system and applications. An external drive connects over USB, so you can carry it between computers or use it for storage and backups without opening the case.
| Priority | Better fit | What to check |
|---|---|---|
| Booting Windows or running applications | Internal SSD, usually M.2 NVMe when supported | Available slot or bay, drive protocol and size, and NVMe boot support if applicable |
| Portable storage or moving files between PCs | External SSD | The PC’s USB data specification, cable, and drive’s connection limits |
| Using a spare SSD for backups or transfers | Existing SSD in a compatible USB enclosure | Whether the enclosure supports SATA or NVMe, as appropriate |
| Basic use on a system that supports SATA | 2.5-inch or M.2 SATA SSD | Protocol support, connections, and local price for the same capacity |
An external SSD can be worthwhile for a desktop, but it is not simply an internal boot drive with a different plug. Its strongest advantages are portability and simpler installation; for a system-drive upgrade, the internal option is usually more direct.
Check compatibility before comparing prices
“M.2” describes a drive’s physical form factor, not a guarantee that it uses a particular protocol. M.2 drives may use SATA or PCIe/NVMe, and a system that supports one may not support the other. Kingston advises checking for an open 2.5-inch bay for SATA SSDs or an M.2 slot for NVMe or SATA SSDs, but the exact support depends on the computer: Kingston’s SSD compatibility guidance.
#1 Best Overall
- MEET THE NEXT GEN: Consider this a cheat code; Our Samsung 990 PRO Gen4 SSD helps you reach near max performance with lightning-fast speeds; Whether you’re a hardcore gamer or a tech guru, you’ll get power efficiency built for the final boss
- REACH THE NEXT LEVEL: Gen4 steps up with faster transfer speeds and high-performance bandwidth; With a more than 55% improvement in random performance compared to 980 PRO, it’s here for heavy computing and faster loading
- THE FASTEST SSD FROM THE WORLD'S FLASH MEMORY BRAND: The speed you need for any occasion; With read and write speeds up to 7450/6900 MB/s you’ll reach near max performance of PCIe 4.0 powering through for any use
- PLAY WITHOUT LIMITS: Give yourself some space with storage capacities from 1TB to 4TB; Sync all your saves and reign supreme in gaming, video editing, data analysis and more
- IT’S A POWER MOVE: Save the power for your performance; Get power efficiency all while experiencing up to 50% improved performance per watt over the 980 PRO; It makes every move more effective with less consumption
- Identify the exact PC or motherboard model. Use its specifications or manual rather than relying on the connector’s appearance.
- Confirm the drive connection and protocol. For M.2, check the supported physical size and whether the slot accepts SATA, PCIe/NVMe, or both. For a 2.5-inch SATA SSD, check that there is a bay, SATA data connection, and SATA power connection. MSI’s storage-installation guidance describes the SATA data and power connections.
- Check boot support if you will install or migrate the operating system. Some older boards may not boot from NVMe; verify this for your model before buying. PC Gamer’s NVMe guide discusses the distinction between interface performance and system support.
- For an external drive, check the USB port’s data specification. A USB-C-shaped port does not by itself tell you its data rate. Use the cable intended for the SSD and check the PC’s port specifications. ASUS explains USB 3.2 bandwidth limits.
Installation errors can cause detection or boot problems, and incorrect hardware installation can damage components. MSI recommends consulting model-specific specifications and compatibility information before installation.
How much faster is an external SSD?
External speed is limited by the entire connection: the SSD, its enclosure, the cable, and the host USB port. ASUS lists theoretical interface ceilings of 5 Gb/s for USB 3.2 Gen 1, 10 Gb/s for Gen 2, and 20 Gb/s for Gen 2×2. Those are bandwidth ceilings, not guaranteed sustained file-transfer speeds; a slower component in the chain can limit the result.
Rank #2
- THE SSD ALL-STAR: The latest 870 EVO has indisputable performance, reliability and compatibility built upon Samsung's pioneering technology.Computer Platform:PC.Encryption : Class 0 (AES 256) TCG/Opal v2.0, MS eDrive (IEEE1667), Environmental Specs - Shock : 1,500 G & 0.5 ms (Half sine).
- EXCELLENCE IN PERFORMANCE: Enjoy professional level SSD performance with 870 EVO, which maximizes the SATA interface limit to 560/530 MB/s sequential speeds, Accelerates write speeds and maintains long term high performance with a larger variable buffer
- INDUSTRY DEFINING RELIABILITY: Meet the demands of every task from everyday computing to 8K video processing, with up to 2,400 TBW
- MORE COMPATIBLE THAN EVER: 870 EVO has been compatibility tested for major host systems and applications, including chipsets, motherboards, NAS, and video recording devices. Interface- SATA 6GB/s, compatible with SATA 3GB/s and SATA 1.5GB/s interfaces
Internal interface figures also need context. PC Gamer gives theoretical limits of 600 MB/s for SATA, 4,000 MB/s for PCIe 3.0, and 8,000 MB/s for PCIe 4.0. These are interface limits, not promises that a particular drive will sustain those transfer rates. Actual performance depends on the drive and system, so do not choose by the largest advertised sequential-speed number alone.
SATA can still be a sensible budget choice for ordinary office work when the PC supports it and the price is compelling. Kingston says SATA 3.0 supports up to 600 MB/s across supported 2.5-inch, mSATA, and M.2 SATA form factors. Check the protocol as well as the form factor: an M.2 SATA drive is not automatically compatible with an M.2 NVMe-only slot.
Free tools Windows power users keep installed
One-click scans. No signup required.
Rank #3
- HUGE SPEED BOOST: Get random read/write speeds that are 40%/55% faster than 980 PRO; Experience up to 1400K/1550K IOPS, while sequential read/write speeds up to 7,450/6,900 MB/s reach near the max performance of PCIe 4.0*
- BREAKTHROUGH POWER EFFICIENCY: Use less power and get more performance; Enjoy up to 50% improved performance per watt over 980 PRO, plus optimal power efficiency with max PCIe 4.0 performance**
- SMART THERMAL CONTROL: Samsung's own nickel-coated controller delivers effective thermal control; With its slim size, 990 PRO is a perfect fit for desktops and laptops that meet the PCI-SIG D8 standard***
- THE CHAMPION MAKER: Up to 65% improvement in random performance enables faster loads for an ultimate gaming experience on PS5 and DirectStorage PC games****
- SAMSUNG MAGICIAN SOFTWARE: Get the most out of your SSD with Samsung Magician's advanced yet intuitive optimization tools; Monitor drive health, protect valuable data, and receive important updates for your 990 PRO
Which option is cheaper?
The available price examples do not establish a fair winner. In a PC Gamer roundup dated October 2, 2026, a 1 TB Adata SE880 external SSD was listed at $149.99, while a 1 TB Biwin Black Opal NV7400 internal PCIe 4.0 NVMe SSD was listed at £124.49. These prices are in different currencies, may change or disappear, and are not a like-for-like comparison within one market: PC Gamer’s roundup.
For your own budget, compare the same capacity and check local prices, including any enclosure you need. A low-cost internal drive is not a bargain if your PC cannot use it; an external drive may cost more but avoid installation or serve several computers.
Rank #4
- Upgrade your laptop or desktop computer and feel the difference with super-fast OS boot times and application loads
- Exceptional performance offering up to 535MB/s seq. Read and 500MB/s seq. Write speeds
- Superior performance as compared to traditional hard drives (HDD)
- Ultra-low power consumption
- Backwards compatible with SATA II 3GB/sec
Can you reuse an SSD in a USB enclosure?
Yes, if the enclosure matches the SSD’s interface and physical format. A compatible enclosure can turn a spare SATA or NVMe drive into portable storage for backups or file transfers. Intel notes that adapters can affect performance and may change whether BIOS or management tools detect the drive: Intel’s storage-adapter guidance.
Reusing a drive this way does not make it equivalent to a directly installed boot drive. Treat it as an external-storage solution unless your PC and setup specifically support booting from that external connection.
Recommended Free Tools
Quick Recap
Best Value
- THE SSD ALL-STAR: The latest 870 EVO has indisputable performance, reliability and compatibility built upon Samsung's pioneering technology. S.M.A.R.T. Support: Yes
- EXCELLENCE IN PERFORMANCE: Enjoy professional level SSD performance which maximizes the SATA interface limit to 560 530 MB/s sequential speeds,* accelerates write speeds and maintains long term high performance with a larger variable buffer, Designed for gamers and professionals to handle heavy workloads of high-end PCs, workstations and NAS
- INDUSTRY-DEFINING RELIABILITY: Meet the demands of every task — from everyday computing to 8K video processing, with up to 600 TBW** under a 5-year limited warranty***
- MORE COMPATIBLE THAN EVER: The 870 EVO has been compatibility tested**** for major host systems and applications, including chipsets, motherboards, NAS, and video recording devices
- UPGRADE WITH EASE: Using the 870 EVO SSD is as simple as plugging it into the standard 2.5 inch SATA form factor on your desktop PC or laptop; The renewed migration software takes care of the rest
Make the choice
- Choose an internal M.2 NVMe SSD for a boot or application drive when the PC has a compatible slot and supports NVMe booting where needed.
- Choose an external SSD when portability, backup use, or avoiding internal installation is more important than a direct internal connection.
- Consider SATA for a compatible older system or basic workload if the same-capacity local price makes sense.
- Consider an enclosure if you already own a spare SSD and need portable storage rather than a straightforward internal boot-drive upgrade.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
