Originally Posted by nheppeard
Then I probably won't bother.... Thanks for the advice
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Just to give you a little edumucation on it in case Googling might be confusing.
There are 2 types of SSD on the M.2 setup right now (not getting into the notches or lengths). You have SATA and PCI-E.
SATA M.2 is simply the same thing you'd find in your typical 2.5" SSD. Uses the same basic hardware and gives the exact same performance. It also utilizes a SATA slot on your board making one SATA port unuseable.
PCI-E on the other hand uses a different controller and enhances the speed. For instance, my M.2 SSD is PCI-E and my reads are over 1GB/s and writes somewhere around 700MB/s. It also does not use up a SATA port as the data transfer is direct to PCI-E.
With PCI-E you also have the difference between Gen 2 and 3, and 2x vs 4x speeds. Obviously like with other PCI-E cards the faster it is, more bandwidth can be had, and gives way for faster SSD speeds.
Now the big game changer is NVMe vs AHCI. AHCI is a very old standard made for platter drives and hampers the performance capabilities of flash based storage. Enter NVMe which was designed exclusively for PCI-E flash storage (basically) and really opens up the speed capabilities.
In all reality though, it's IOPS that make a huge difference in perceivable performance differences. How fast your 4k write and read speeds are on an SSD will make a noticeable improvement on Windows performance. Raw sequential speeds are pretty much only good for fast data transfers once you get to a certain speed.