Bought a new SSD, speed slower than expected

[daanji]

So bought a brand new Samsung 850 EVO 500 GB SSD from newegg.com and installed.

While speed is good, it is not what I expected. According to the specifications, I should be getting 540 MB/s read and 520 MB/s writes.
Based on the AS SDD test bench, I am getting 400 MB/s read and a paltry 180 MB/s writes.

I did some research and disabled the following

• Indexing
• Paging
• Prefetch

I also ensured it was connected to a SATA III 6.0 Gbps port on my motherboard.


I also used Samsung Magician tool, which comes with its own performance optimization and performance benchmark tools. According to their own tool, I am getting the same results as in AS SDD.

So does anyone else have some ideas why my performances seems really low?