Samsung PM840 Pro Reviews
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"The Samsung SSD 840 Pro is by far the fastest SSD currently around- faster than the OCZ Vertex 4, faster than the Corsair Neutron GTX and faster than the Plextor M5 Pro. Samsung also has a proven track record in terms of reliability and quality, as the Samsung 830 series had very few known issues. History is of course not a guarantee for future success, but there is no reason to think that the new 840 Pro series will be any less dependable."
"Wit the 840 we are more reserved. Particularly the write speeds of these SSDs are limited, which does affect real-life performance. It turns out this differs depending on the storage capacity. We would not recommend the 120 GB, but the 250 GB is better and the 500 GB model is the best out of the three. Theses SSDs are more interesting because of their affordable price, which will likely go down even more thanks to the use of TLC memory. If you will use your SSD intensively, then we recommend getting another model. The Samsung 840 Pro earns the Gold Award."
"As a system drive with the operating system and applications running from the Samsung 840, this SSD is pretty hard to fault. Its excellent reading performance ensures that applications launch very quickly, and it has more than enough writing performance to make sure that the Samsung 840 never feels sluggish.
Where things are not quite so good is when you start to use the free space on the SSD as a scratch disk for editing and storing data that you may be working on. Apart from the fairly low sequential writing speeds (by today’s standards), the other slight problem is that writing performance is unpredictable when 840 has reached a stage where is has no clean NAND to work with. With some idle time, performance is very decent indeed, but push the drive hard with sequential writes, then it appears that garbage collection just can’t keep up with the demand, which appears to be down to the TLC NAND implementation in this SSD."
"With the PM840, Samsung has got a 256 Gigabyte SSD in its portfolio that can easily keep up with the competition these days. In fact there are quite a few disciplines where the PM840 is even cabable of raising the bar. During our tests we measured 100'000 IOPS reagarding random reads of 4k blocks and 72'000 IOPS concerning random writes. Therefore when it comes to random reads Samsung's PM840 with 256 Gigabyte capacity is capable of outperforming all other drives that use one single controller."
"With a faster, more optimized ARM Cortex R4 controller and NAND flash pushing data at 400 Mbps per channel, the Samsung 840 Pro has risen the bar yet another notch even while the competition was still trying to catch up to the 830 Series. If pricing can achieve parity with other SSDs out there, Samsung is sure to have a winner on its hands. The non-pro variant of the 840 will utilize TLC flash, which should offer a decent reduction in cost/GB for a minor dip in performance and endurance, which promises to make some form of 840 available to anyone seeking performance in the 100,000 IOPS range."