SSD terrible read and write speeds.

Apr 16, 2018
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Specs:
AMD fx-8320 3.5 ghz
GTX 970
8 gb ram
asrock fatality 970 performance motherboard
SSD: Crucial_CT256MX100ssD1

After a little but of online research I have found my read and write speeds on my SSD are terribly low. They fluctuate but I haven't seen either go over 400 KB/s. About three days ago I noticed using google chome would freeze the computer, or just go non responsive for a few seconds before bringing up the webpage slowly. Applications will also take a very long time to load and freeze the screen periodically.
I have found that some people have found a fix when they switch their AHCI driver to IDE in the BIOS but when I go into the BIOS I can find AHCI but there is no other option of IDE to switch it to.

If anyone can help with this solution or maybe have another solution is would be greatly appreciated.