Getting 20MB/s disk writes on my newly installed SSD

I installed my SSD that I've been using with no hiccups or problems in my desktop PC for a year, in my MB Pro, since I was using it more than my desktop, but I am getting super slow speeds from Black Magic Speed Test and I have no idea why.

In system information it says that I have 6 Gigabit Linkspeed under SATA. My firmware is up to date and I'm running the latest version of El Capitan.

Any help appreciated

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You likely need to replace the HD drive cable. The older cable was rated for SATA II (3.0 Gb/s) not SATA III (6.0 Gb/s). The early versions of this system had a SATA II HD drive.

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I went to an Apple store today, and the employe told me to run an Hardware Test, which yielded no results.

How can I tell if I need to replace the HDD Cable?

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What is happening here is the dialog between the SSD to the System as well as from the System to the SSD is failing when you have a heavy data flow. Each read & write has a CRC checksum if the checksum fails to Ack the given data block it's retransmitted. Think of it this way, think about having a conversation with a half deaf person so every other word needs to be re-spoken. This is what is happening here, AHT won't catch this as it doesn't put enough strain on the connection unlike Black Magic or Drive Genius stress tests.

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