Product Comparison: SanDisk Extreme II vs Samsung 840 PRO -1

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General Specifications
Extreme II
840 PRO
About the Product
Whether it’s extending the battery life of your PC or improving your gameplay, the SanDisk Extreme® II SSD is the reliable drive for you. Enjoy faster performance1 , providing next-level speed for your graphic-intense games. Get faster load times and enhance your computing experience from boot-up to shut-down and every moment in-between.
The Samsung 850 PRO SSD redefines storage with the world’s first drive based on 3D VNAND flash, offering exceptional read/write performance, reliability and power management efficiency. The 850 Pro delivers up to 2x the speed, density and endurance of conventional flash. The next leading SSD for performance, endurance and energy efficiency.
Key Specs
Form Factor - 2.5"
Form Factor - 2.5"
Available Capacities
120 GB, 240 GB, 480 GB
256 GB, 512 GB, 128 GB
Max. Transfer Speed
550 MB/sec
540 MB/sec
What customers say about "Key Specs"
SanDisk Extreme II 120GB Solid State Drive
  • It's great, especially for my purposes in editing. Getting this drive will ensure that the hard drive is no longer bottle-necking your system in any way.
  • Everything from boot up to the launching of apps is a hundred-fold faster and I'm absolutely happy with my purchase.
  • Works right out of the box, no problems. Improved my windows 8 disc score to almost maximum.
  • I like these drives a lot. They are reasonably priced, perform well. If you are looking for a way to boost performance on your laptop or desktop, an SSD drive is the way to go.
  • This SSD is fast. But more importantly for me and should be for everyone, is the SanDisk reliability record. Highly recommended.
  • Random reboots hurt. Every day or other day I experience a random reboot. The other SSD boot drive in this system has never done this, so it has to be this SSD.
Samsung 840 PRO -1 Series 2.5-Inch Solid State Drive, 256GB
  • The product is well constructed. The 500gb SSD has plenty of room for pretty much everything, operating system, games, and all of my most used programs.
  • OMG! This thing is not just fast it is AMAZING! This is, quite simply, the new biggest upgrade you can make to computer speed.
  • There is no hard drive related sounds, etc. The computer has become super quiet. So quiet that sometimes I hear the basal high-pitched noise coming from the motherboard.
  • If you are like me and tired of having traditional hard drives die on you get an SSD. This is the smallest one I would recommend. It is worth the upgrade!
  • There are NO links to this drive that allow you to contact customer support for the shoddy software. Think twice. A drive is only as good as the support.
Size & Weight
2.75 in.
2.75 in.
3.96 in.
3.94 in.
0.28 in.
0.28 in.
1.92 oz.
1.92 oz.
OS Compatibility
Mac OS X, Windows
Windows, Linux, Mac OS X, Unix
SATA 6Gb/s
SATA 6Gb/s
Password Setting
Data Protection
Shock-resistant, Vibration resistant
Secure Encryption
Thermal throttling, Noise reduction
3-Core Samsung MDX Controller
What customers say about "Features"
SanDisk Extreme II 120GB Solid State Drive
  • The drive runs great...couldn't be happier, and now I'm prepared for the future to have a good drive to make my main, down the road when 500gb SSD's become more affordable for backup.
  • Low heat, low power, light weight, fast performance, rugged, easy and fast install and my first SSD.
  • The boot-up is much faster, and the performance increase substantial. I have two of these drives in my home-built desktop. They installed with no issues.
  • The computer now boots extremely quickly and games run much faster and smoother. I store my photos and movies to an external RAID storage device. I love it.
  • It said it goes 500 MB/s but unfortunately, it only goes like 250 max so I was pretty dissapointed. But it is good.
Samsung 840 PRO -1 Series 2.5-Inch Solid State Drive, 256GB
  • I highly suggest adding this SSD to your computer or laptop. This drive lets me boot up my PC in under 10 seconds, and game loading is practically nonexistent.
  • I turned on the laptop and it took a good 30 seconds to load with a standard HD with windows 8. With this new SSD it takes 4 seconds to load the operating system! yes 4 SECONDS!
  • From cold start to a working desktop, it takes 23 seconds with the SSD vs. 42 seconds with the HDD. Photoshop loads in 3.9 seconds vs. 12 seconds. It's like buying a new computer.
  • After the installation of the SSD, you will pretty much see improvements: start up times, opening up programs, the browser, better battery life, less heat, better reliability, etc.
  • The package contains only the drive, no cables or adapters. Larger drives are available for less. The bad part about the drive is the frustrating included software.
Additional Accessories
12” SATA Cable, Spacer, 3.5” Bracket
SanDisk SSD Dashboard, SanDisk Secure Access software
Samsung SmartMigration Software, Samsung Magician 4.0
Power Supply
Warranty / Certifications
Manufacturer Warranty
5 year(s)
5 year(s)
Other Information

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