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SSD Performance halved

I have a Samsung 840 PRO 250gb SSD and when I bought it a month ago I got 557 MB/s read and 493 MB/s write which was great. Today I decided to do another benchmark and got 284 MB/s read and 266 MB/s write.
I am using iaStor and benchmarked both with AS SSD and Samsung Magician. The drive is neither half full nor the system drive. I recently reassembled my pc in a new case to fit my new gfx card and the good benchmark was before the reassembly.
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  1. Best answer
    Did you plug the drive by any chance into a SATA 2 port during re-assembly?
  2. gaborbarla said:
    Did you plug the drive by any chance into a SATA 2 port during re-assembly?

    So obvious and yet I've missed it.... Thank you
  3. Your symptom shows a lack of bandwidth in the sata connection.
    If you reconnected the ssd to a 3mb/s port instead of a 6mb/s port you would get those results.

    Or... if the graphics card install caused the motherboard to shift bandwidth from the sata ports to the graphics pcie lanes.

    What motherboard do you have, and where are parts connected?
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