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Current version by: R.T. ,

Text:

I installed a Samsung 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
You can use the adapters from the the MacBook Air etc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
 
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that can easily shorts to the adapter header. I confirmed with my multimeter. This can short out the power rails and most of the PCIE bus! This would help explain why some people have issues (failure to start and crashing).
 
I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side but obviously not the gold plated card edge pins. See attachment.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

I installed a Samsung 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
 
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that shieldcan easily shorts to the adapter header. I confirmed with my multimeter. This can short out the power rails and most of the PCIE bus.bus! This would help explain why some people have issues (failure to start and crashing).
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that shieldcan easily shorts to the adapter header. I confirmed with my multimeter. This can short out the power rails and most of the PCIE bus.bus! This would help explain why some people have issues (failure to start and crashing).
 
I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins. See attachment.
I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins. See attachment.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

I installed a Samsung 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
 
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shortscan short out the power rails and most of the PCIE bus. This would help explain why some people have issues (failure to start and crashing).
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shortscan short out the power rails and most of the PCIE bus. This would help explain why some people have issues (failure to start and crashing).
 
I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

First off, I want to set a fix things straight. II installed a Samsung 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
First off, I want to set a fix things straight. II installed a Samsung 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etcetc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
You can use the adapters from the the MacBook Air etcetc… with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
 
I haven’t seen this posted anywhere, but the newer sockets on this logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. This would help explain why some people have issues (failure to start and crashing).
 
I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

First off, I want to set a fix things straight. I installed a 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etc etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
You can use the adapters from the the MacBook Air etc etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout).
 
BUT, one reason a lot of people have issues (failure to start and crashing) and II haven’t seen this posted anywhere is that onanywhere, but the newer sockets on thethis logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. IThis would help explain why some people have issues (failure to start and crashing).

I
used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
BUT, one reason a lot of people have issues (failure to start and crashing) and II haven’t seen this posted anywhere is that onanywhere, but the newer sockets on thethis logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. IThis would help explain why some people have issues (failure to start and crashing).

I
used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

First off, I want to set a fix things straight. I installed a 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout in this casepinout).
You can use the adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols ACHI vs NVMe with same pinout in this casepinout).
 
BUT, one reason a lot of people have issues (failure to start and crashing) and I haven’t seen this posted anywhere is that on the newer sockets on the logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

First off, I want to set a fix things straight. I installed a 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
First off, I want to set a fix things straight. I installed a 970 EVO 2TB M.2 in my mid-2017 27” 5k iMac and it works great with 4x NMVe speeds.
 
You can use the “PCIe/AHCI” adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols are used with newer hardwareACHI vs NVMe same pinout in this case).
You can use the “PCIe/AHCI” adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols are used with newer hardwareACHI vs NVMe same pinout in this case).
 
BUT, one reason a lot of people have issues (failure to start and crashing) and I haven’t seen this posted anywhere is that on the newer sockets on the logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
BUT, one reason a lot of people have issues (failure to start and crashing) and I haven’t seen this posted anywhere is that on the newer sockets on the logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. I used Kapton tape (electrical tape works also, but is not as clean). You want to cover the soldered header pins on the adapter socket on the mating side , but obviously not the gold plated card edge pins.
 
[image|1737064]
 
[image|1737060]

Status:

open

Edit by: R.T. ,

Text:

First off, I want to set a fix things straight.
 
You can use the “PCIe/AHCI” adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols are used with newer hardware).
 
BUT, one reason a lot of people have issues (failure to start and crashing) and I haven’t seen this posted anywhere is that on the newer sockets on the logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. I used Kapton tape (electrical tape works also, but is not as clean).
 
[image|1737061image|1737064]
[image|1737061image|1737064]
 
[image|1737060]

Status:

open

Original post by: R.T. ,

Text:

First off, I want to set a fix things straight.

You can use the “PCIe/AHCI” adapters from the the MacBook Air etc with your 5k mid-2017 iMac … and you will get NVMe 4x speeds with a 4x lane drive . Physically the adapters are the same (different protocols are used with newer hardware).

BUT, one reason a lot of people have issues (failure to start and crashing)  and I haven’t seen this posted anywhere is that on the newer sockets on the logic board have an extended shield that shield shorts to the adapter header. I confirmed with my multimeter. This shorts out the power rails and most of the PCIE bus. I used Kapton tape (electrical tape works also, but is not as clean).

[image|1737061]

[image|1737060]

Status:

open