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The March 2015 update of Apple's 13" MacBook Pro Retina Display, model A1502, features fifth-generation Intel Core i5 and i7 processors and introduces the Force Touch trackpad.

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Upgraded my SSD, Was it not suppose to keep same read/write rates?

My Macbook Early 2015 13" was with 128gb SSD.

I bought a 256 SSD from the IFIX Shop, and did the upgrade. The guide was amazing, by the way.

However, I opted for this SSD than the OWC, because I thought it would keep the same read and write rates that my 128 SSD was doing.

Am I right? Being the same SSD brand from Apple, should work close the rates.

Results with 128 SSD:

Block Image

Results with 256 SSD:

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Should I change some settings? Where?

Update (10/05/2016)

SSD 128:

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Block Image

SSD 256:

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Print of System Report


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Can you take a picture of the drives labels (both) so there are readable and post them here for us to see. Also if you can also take a snapshot of the system reports listing of both SSD's. You'll find it under the About This Mac. We need to see the full righthand window when you click on the SSD on the left.

I may know the answer here but I want to make sure.


Hey Dan<

See if you can help me =).. It looks fine. Maybe there is some changes to be done. I don't know.




Exactly, I can see there 4x for the 256 too. But They sold me one 2x.

It's my first time buying here, do you think they would replace or refund it?

I choose buy from them because have a look here:

[bağlı ürün eksik veya kapalı: IF188-108-2]

It says replacement for 13' early 2015 Retina.


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Well, I can tell you what I had thought is not the case here. Apple had used a Toshiba unit which had less performance, I was thinking that was your issue here.

Both are Samsung SSD's and they appear to be within the same series (other than size). Its true the larger flash chips do run a bit slower, I'm not sure if that is the case here. I'll need to do some more digging.

The last piece here was the width of the PCIe lanes you got the info on the 256 unit we didn't get it for the 128 unit.

It's in the SATA/SATA Express section 'Link Width' which is just visible in your first snap for the 256. See if it's the same on the 128 unit. Thats the only thing I can see here that would explain the difference from an interface perspective. That then leaves the firmware within the SSD unit. Check the 'Revision' see if that is the same when you look at the 128 unit.

As to settings sorry nothing here to alter. Unlike HD's which the data can get scattered (fragmented) SSD's don't have this issue as the addressing of the data blocks is the same across the entire storage space of the SSD. Because of this inherent difference we don't need to defragment the drive to regain performance.

The one thing that can effect performance on a SSD is the amount of free space. SSD's like lots of free space so they don't overwear a given block area. I recommend leaving 1/3 free on the smaller drives and the larger 512 and higher you should only need to set aside 1/4. Given the fact you just upgraded I doubt you have even used that much space just keep it in the back of your mind.

You might want to get this utility: DriveDX. It will allow you to see the condition of your SSD and how much of it is worn. Again, I don't see this as the issue here just something useful as you use your SSD to keep an eye on it.

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I updated the picture, and my 128 is 4x and the 256 that I got from Ifix is x2 =( .

It was saying SSD Macbook Retina 2015. Do you think they would replace or refund it?


Well... I'm not sure here. Its possible someone assumed - ass/u/me ;-} something and it didn't click with the other, or, it was an honest mistake.

I would give them a call or email to at least find out. IFIXIT is very good on its return policy so I don't think you'll have a problem.

Don't be surprised it they don't have the x4 version and/or its more expensive ;-{


Sure, IFixIt is amazing community, I believe that can be a mistake or misunderstanding.

Thank you very much for your help.


Dan, the sent by mistake and don't have the 4x PCI. Would you recommend other place to buy it? I really need to upgrade my Mac... 128 is useless ... Lol

Thank you for all your help!


Sorry I don't work on many retinas so I don't have any sources for SSD drives. Looking on the web I found this one: Apple MZ-JPV2560/0A3 / MZ-JPV2560 Samsung 256Gb PCI-Express Internal Solid State Drive (SSD) Double check with them if it's a x4 drive, but its big bucks!


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