Question New Transcend SSD is not reaching maximum write speed on Macbook Pro ?

Apr 18, 2022
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Upgraded my MacBook Pro mid 2014 with an ifix it battery and a new transcend ssd. The battery is working good but the ssd is at lower write speed.

Transcend 240GB JetDrive 850 NVMe PCIe Gen3 x4 SSD TS240GJDM850

The original Samsung is a x2 lanes and I reach speeds of 500/600mb/s

The new ssd is a x4 (supported by the MacBook) and should reach speeds of 1000+mb/s. Other people confirmed that they get them for the same MacBook.

I have done a complete macOS re-install but was not able to get more that 600/700mb/s write speed.

Read speed is with 1200mb/s. I have tried other ssd brands and have seen a similar behavior but thought was the ssd quality.

Any suggestions on what could be wrong and how could I fix it?
 
Apr 18, 2022
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Hi, the ssd was freshly formatted and the OS newly installed. Is there some macOS settings that I could check to understand why this is happening? Seems other people with the same setup get higher write speeds.
 

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