Maxim Posted February 11, 2014 Report Share Posted February 11, 2014 Doesnt SATA III max out at 580ish MB/sec? Samsung's RAPID technology uses either up to 25% or 1GB of system RAM (whichever is lower) to cache for the SSD, similar to how you can use an SSD to cache for an HDD on newer Intel chipsets. For short tests like these the numbers are greatly inflated due to the massive speed difference between SATA storage and the system DRAM cache. The first 1GB of any drive speed test on a Samsung SSD running RAPID is effectively a DRAM speed test. The upside is greatly increased read and write speeds for files under a certain size that are cached by the software. The downside is that if power is lost any data that was cached in DRAM but wasn't committed to the drive is lost and you risk data corruption. This is likely why it is toggled off by default. The 840 EVO also has a small amount of NAND (flash memory) running in SLC mode which it uses as a "TurboWrite buffer". When writing data to the drive it writes to the SLC "buffer" section first and then once the write operation completes it moves that data from the SLC buffer to the normal, slower TLC NAND . The SLC NAND is much faster and if a write operation doesn't fill the SLC section then you basically get the speed of SLC NAND when writing to the drive. The downside here is that if the write operation is larger than the size of the SLC buffer then you will fill the buffer and start writing directly to the slower TLC NAND which will result in a speed drop until the write is complete and the contents of the buffer can be moved. This isn't as big of an issue given that TLC NAND is the type of NAND used in the original 840 and is still very fast. The SLC buffer is also fairly large and is rarely filled in a single write operation unless you're working with very large files. All of this info courtesy of AnandTech: http://www.anandtech.com/show/7173/samsung-ssd-840-evo-review-120gb-250gb-500gb-750gb-1tb-models-tested The 840 EVO is a fast drive not due to a faster controller or faster flash memory but due to a few intelligent data management tricks. Are they legitimate? For most end-user cases, absolutely. The speed increase is clear in tests and is a tangible benefit for users who mostly deal with files that work within the file size limitations or use it as an OS and programs drive. If a user plans to put a lot of data on it, will hit their drive with a ton of writes, large files, and NEEDS data security, then that user is better served by the 840 Pro or possibly other manufacturers' offerings. wtf is lolcats? I'd def get a fat hooker if i had to resort to that kinda thing. I feel like they'd be grateful and work harder. Also its more bang for my buck, more real estate for my dollar if you catch my drift. its like the Costco of streetwalkers. I was hoping for 150 . I was hoping she would let me put it in her butt Link to comment Share on other sites More sharing options... 145 2.5k
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