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M.2 Sata SSD vs Conventional SSD?

Firstly, am I correct in thinking M.2 Sata SSDs are PCI-e flash based storage devices? I wanted to get a Samsung Evo 840 but I only have Sata II 3Gb/s ports so it's not like I could get everything out of the SSD. I recently saw a video of a comparison of a mac pro and a custom PC and the mac pro had PCI-e based flash storage and blew the PC out of the water in copying files, even though the PC had an SSD.
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  2. So which would be the best SSD for me to get considering I only have Sata II 3Gb/s ports in my motherboard
  3. hamzah442 said:
    So which would be the best SSD for me to get considering I only have Sata II 3Gb/s ports in my motherboard


    What motherboard do you have?
  4. Best answer
    The main benefit of a ssd is low latency. It is 50x faster than a hard drive doing small random I/O. That is what the os does 90% of the time. Using sata II does not impact the performance hardly at all.
    When doing sequential operations on sata II, the transfer rate will be capped at 250mb/s or so. That is still 2x what the best hard drives do. Sata 3 upps that to the 550 range.
    Bottom line------- Go ahead and buy the evo, it will be one of the best performance upgrades you ever buy.

    The advantage of the newer pcie based devices is the possibility of upping the sequential transfer rates from 550 to perhaps 1000. The actual benefit will not be that great.
    And... buy a larger ssd if you can. The extra nand chips increase the sequential performance some.
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