Weird Read/write speed on MID-2014 MBP13 with Sintech nvme

[dochugo]

Just bought a sintech adapter along with a transcend 110S 512GB.
according to Aureliac chart on Twitter i should have around 1GB Read/Write Transfer rate.
But after doing some test on blackmagic, be sure TRIM is activated, that the correct Bootrom is installed.
i don't see what's wrong.

 

[Audit13]

How full is the drive?

Did you perform a clean installation of macOS or did you restore from a backup?

 

[dochugo]

How full is the drive?

Did you perform a clean installation of macOS or did you restore from a backup?

Less than a quarter full, i did perform a clean install but i did recover my data on startup from the old drive

 

[Audit13]

Less than a quarter full, i did perform a clean install but i did recover my data on startup from the old drive

Don't think this would account for the low read/write speeds.

Is it possible that the pins on the Sintech are touching the metal shield above the logic board's SSD connection? Tried removing and re-installing the adapter and SSD?

The SSD is running the latest firmware?

 

[dochugo]

Don't think this would account for the low read/write speeds.

Is it possible that the pins on the Sintech are touching the metal shield above the logic board's SSD connection? Tried removing and re-installing the adapter and SSD?

The SSD is running the latest firmware?

Okay thanks for your response i will check about this metal-shield, i have a recent version of the sintech the pin of the adapter are protected with black tape
The ssd is a recent revision (weirdly with less memory chip) and running the latest firmware.

 

[Audit13]

Okay thanks for your response i will check about this metal-shield, i have a recent version of the sintech the pin of the adapter are protected with black tape
The ssd is a recent revision (weirdly with less memory chip) and running the latest firmware.

Are you using the small or long adapter?

Yes, the original Sintech adapter may have needed Kapton tape but the newer revisions did not. I have used both the original and newer revisions in MacBook Airs with good read/write speeds from low-end NVMe drives.

 

[dochugo]

Update
Sometimes, the test goes around 900mb/s on write and drop to 60 on further tests.

 

[dochugo]

Are you using the small or long adapter?

Yes, the original Sintech adapter may have needed Kapton tape but the newer revisions did not. I have used both the original and newer revisions in MacBook Airs with good read/write speeds from low-end NVMe drives.

It's the small version, green pcb. bought from amazon (link was provided on aureliac's twitter) trough kalea reseller

 

[Audit13]

Fluctuating read/write numbers is not uncommon if you change the file sizes used in the tests.

Does the drive feel faster or slower than the original SSD?

 

[dochugo]

Fluctuating read/write numbers is not uncommon if you change the file sizes used in the tests.

Does the drive feel faster or slower than the original SSD?

I did not it's always set on 5Gb

Yes i think so.. pretty unfortunate i was hoping it was faster than the original SM0256F

 

[Audit13]

If the original Apple SSD is the Samsung SSUBX, it's a good drive is 4 lanes wide. Some of the 2014 Pros came with the Samsung SSUAX which is 2 lanes wide.

If the drive works and seems no slower than the original, I would just live with it. Benchmarks are nice but they don't always translate into worse or better everyday performance.

The Pro 13" uses a PCIe 2.0 bus so extremely fast drives are going to be limited by the PCIe bus speed.

 

[dochugo]

If the original Apple SSD is the Samsung SSUBX, it's a good drive is 4 lanes wide. Some of the 2014 Pros came with the Samsung SSUAX which is 2 lanes wide.

If the drive works and seems no slower than the original, I would just live with it. Benchmarks are nice but they don't always translate into worse or better everyday performance.

The Pro 13" uses a PCIe 2.0 bus so extremely fast drives are going to be limited by the PCIe bus speed.

Will check potential connection problems.

The original drive was kind of slow on benchmark for sure (around 500/500mbs)... but it was maybe fine on everyday usage

thanks for your time !

 

[dochugo]

No change, will get back to the old one.
quite unfortunate