RAPID is an acronym for Real-Time Accelerated Processing of I/O Data. As you can see in the screencap above (taken from HD Tune Pro), writes are much faster when the TurboWrite buffer is being utilized, but its effect on performance can be a bit unpredictable.Īnother interesting feature carried over from previous-gen drives is dubbed RAPID. TurboWrite should allow the 850 EVO series to perform very well in the vast majority of consumer-class workloads. This allows the TLC NAND to perform more like a MLC drive for writes, as long as the buffer isn’t exhausted.
In addition to using 32‐layer 3D V‐NAND 3bit MLC NAND flash, Samsung has also dedicated a small portion of the NAND to act like an SLC write buffer-Samsung calls the feature TurboWrite. Endurance ratings are relatively high thanks to the move to 3D V-NAND as well-the 120GB and 250GB drives are rated for 75 TBW, while the higher capacity 500GB and 1TB drives are rated for 150 TBW. If you do the math, however, you’ll find that the drives leave roughly 9% of the NAND capacity for over-provisioning, which is typical of many current SSDs. The 500GB drive you see here has four 128GB pieces of NAND, but there is likely less in the smaller drives and more in the 1TB model. All of the Samsung 850 EVO drives are also outfitted with bleeding-edge 32‐layer 3D V‐NAND 3bit MLC NAND flash memory of varying capacities. The 120GB drive sports 256MB of cache, the 250GB and 500GB drive have 512MB of cache, and the 1TB drive has 1GB of cache. While we're talking about power, we should also mention that the 850 EVO series offers support for low-power Dev-Sleep mode, which can help extend battery life in mobile devices.Īll of the Samsung 850 EVO series drives also feature some LPDDR2-1066 DRAM cache memory. Samsung claims it made this move in order to save power, because the extra core didn’t help performance much on the lower capacity drives. The controller is fundamentally similar to the triple-core MEX controller used in the recently released 850 Pro series, though obviously a core has been removed.
We should also mention that this drive (and the 120GB and 250GB models) feature a new dual-core Samsung MGX controller.
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