I read here as there, so some are unhappy that (usually) is not due to the SSD. Often obstruct reasons of cost manufacturers SATA 3 controller, which is not enough.
Therefore, I advise every: Inform precisely what has been installed for your motherboard controller.
Well-known manufacturers usually obstruct the best controller, which of course is reflected in the prices - finally nevertheless worthwhile.
This affects not only SATA 3 - as well as USB 3.0.
So some complain that SSD, various SD cards, USB sticks, etc. that use the new USB 3.0, supposedly not reach these data rates, as indicated by the manufacturer (Of course, the ideal specifications;. But I know from other of my practice, that are obtained by false Controller, old device drivers, etc. poor results)
Funnily enough, a closer look at car buyers - as most people when buying a computer, tablets etc.
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Note: One should ergo controller device hardware, motherboards on new drivers, etc., etc. manually check or so actually the best results automatically from various software achieved..
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Conclusion: this SSD I built since very long and there is absolutely no problem, as long as well as software is used which negative, physical properties off, which are important in conventional hard drives.
There are now even to the effect cost-free software, such as SSD Tweaker (other) - where you have to turn off exactly functions, so SSD enjoy a long lifetime.
Absolutely no case SSD should as usual - be defragmented - it shortens the lifetime considerably!
Therefore, should the system software, while others, which adjusted, accelerated etc. checks: If the automatic defragmentation really off!
Using Intel SSD controller it precisely matches the predetermined data rates.
Good software is not defragmented also only SSD.