Can i use '15 13" MBA SSD in '14 13" rMBP?

Amethyst

macrumors 6502a
Original poster
Aug 8, 2006
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As i own both mac, the 13" 2015 MBA and 13" 2014 MBP.
I found that the ssd in mba are faster by a large margin (read ~1GBps vs 400 MBps)

But as i use the MBP more than MBA, so can i just pull out the mba ssd and install in mbp?
 

JTToft

macrumors 68040
Apr 27, 2010
3,405
754
Aarhus, Denmark
You can. But you won't get the full speed, as 2014 machines are PCIe x2 where 2015 machines are PCIe x4. That's mainly what's responsible for the speed difference.
 

Amethyst

macrumors 6502a
Original poster
Aug 8, 2006
516
17
You can. But you won't get the full speed, as 2014 machines are PCIe x2 where 2015 machines are PCIe x4. That's mainly what's responsible for the speed difference.
Many thanks for useful information.

What kind of speed i can get with this path?
 

JTToft

macrumors 68040
Apr 27, 2010
3,405
754
Aarhus, Denmark
What kind of speed i can get with this path?
- That I am unsure of. Probably not much more than you already have.

The size of the drives is also a factor. The larger drive will be faster, so if the Air drive is 512 GB while the Pro is 128 GB, you may see increased speeds.
 

JTToft

macrumors 68040
Apr 27, 2010
3,405
754
Aarhus, Denmark
Actually it seems that the PCIe lane width is in the ssd stick not in the laptop motherboard, this article below proofs that if you put 4x lane ssd to 2014 macbook pro it will use all of the 4 lanes.
http://blog.macsales.com/25878-owc-gets-1200mbs-from-ssd-in-2014-macbook-pro-with-retina-display
- Thanks. Did not know that.

The link speed is still only at 5.0 GT/s as opposed to 8.0 GT/s on the 2015s, though. But it seems there indeed is something to be gained.
 

Amethyst

macrumors 6502a
Original poster
Aug 8, 2006
516
17
I just change mba ssd to mbp, and it scream.

now my 2014 mbpr get around 1300 mb read and 800 mb write.
 
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