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Does my 2018 MacBook Pro 15" 512GB have slow SSD speeds?

I

incurma

macrumors newbie
Original poster
Aug 8, 2018
15
1
Expected (as advertised on Apple's website):

Write: 3000 MB/s (give or take)
Read: 2600 MB/s (at least)

Actual (tested using Black Magic):

Write: 1600 MB/s
Read: 2600 MB/s

Is anybody else experiencing something similar? What are your SSD write/read speeds?

There seems to be a community discussion about this as well:

https://discussions.apple.com/thread/8468378
 
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incurma said:
Expected (as advertised on Apple's website):

Write: 3000 MB/s (give or take)
Read: 2600 MB/s (at least)

Actual (tested using Black Magic):

Write: 1600 MB/s
Read: 2600 MB/s

Is anybody else experiencing something similar? What are your SSD write/read speeds?

There seems to be a community discussion about this as well:

https://discussions.apple.com/thread/8468378
Click to expand...


I see the same numbers you are. System is as below.

It would be great for someone to run BlackMagic on a 13" 512 and see what speeds they are seeing.
 
Last edited:
What disk size?

This was Apple's test, you could try to replicate it (someone else will have to advise how though... :p)
Testing conducted by Apple in June 2018 using preproduction 2.3GHz quad-core Intel Core i5-based 13-inch MacBook Pro systems with 8GB of RAM and 1TB SSD, and preproduction 2.6GHz 6-core Intel Core i7-based 15-inch MacBook Pro systems with 16GB of RAM and 1TB SSD. Tested with FIO 3.7, 1024KB request size, 150GB test file and IO depth=8. Performance tests are conducted using specific computer systems and reflect the approximate performance of MacBook Pro.
Click to expand...
 
Brookzy said:
What disk size?

This was Apple's test, you could try to replicate it (someone else will have to advise how though... :p)
Click to expand...

My machine has a 512GB SSD (I cannot believe that I forgot to include that!)

Thread title has been updated as well...
 
Yes, have been stuck in such issue. But luckily to solve it ,here i am glad to share the methods with you.Hope it caan help you.
First, disable Hibernation:
The Hiberfil.sys file almost take a same amount of space as the random access memory (RAM). So it is better to disable it when your SSD runs very slow:
enter the command prompt window by clicking the Start button and type cmd (please run as administrator), and type command powercfg.exe /hibernate off and press Enter.
Seond, make SATA controller runs in AHCI mode
AHCI (Advanced Host Controller Interface) Mode does a fabulous job of keeping the high performance of solid state drive. So when it is disabled, the SSD might run slow and take a very long time to respond. It is better to set your SSD mode from IDE to AHCI.
1) Press WIN+R and type msconfig and then press Enter.
2) Under Boot tab, tick Safe boot, click OK to save the changes, and reboot your computer into safe mode by constantly pressing F2 or DEL. Change your SATA mode from IDE to AHCI. Then save settings to exit and reboot.
3) Windows will boot in safe mode this time. Run msconfig again, and untick Safe boot option Boot tab under and restart your computer.
If you tried these two methods but the problem still unsolved, you can try to align SSD partitions to improve the performance, or completely erase the disk to restore its peak performace, to get rid of ssd slowing down.
 
My 1TB gets ~2690MB for both read and write. I believe the speeds you are seeing are right for the 512GB model.
 
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How to completely disable "hibernation mode" and lock the sleep image' size:

First, disable hibernation mode :
sudo pmset -a hibernatemode 0

Delete the existing sleep image:
sudo rm /private/var/vm/sleepimage

Create an empty file and name it 'sleepimage' :
sudo touch /private/var/vm/sleepimage

Finally, change its flag to immuable :
sudo chflags uchg /private/var/vm/sleepimage

Now, OS X won't be able to rebuilt over your sleepimage file since it is locked.
 
maflynn wrote:
"What does this have to do with 512GB SSD performance"

I was replying to something written in reply #7 above.
I didn't quote it in my post.
Sorry.
 
My latest 512GB SSD on my brand new 13inch 2018 MacBook Pro has the same 1,800 number which is nothing to sneeze about but certainly not 2,600 number that other sizes get. It'll be upsetting if 256GB gets a faster speed, although that's too small of space to work with for me.
 
My 2017 500GB 15" is 1800's Write 2100's Reads. I believe the 1TB would be faster as apple reports.

MBP15" 500GB.png
 
Mine is even worst! Did is also 500GB Flash Storage (as reported by Apple Storage tab)
Bench ran at 5GB size. If I run at 2GB I get better results... so which one would be more accurate?

Screenshot 2018-12-23 11.14.34.png
 
incurma said:
Expected (as advertised on Apple's website):

Write: 3000 MB/s (give or take)
Read: 2600 MB/s (at least)

Actual (tested using Black Magic):

Write: 1600 MB/s
Read: 2600 MB/s

Is anybody else experiencing something similar? What are your SSD write/read speeds?

There seems to be a community discussion about this as well:

https://discussions.apple.com/thread/8468378
Click to expand...

Apple advertises the speeds for the higher tiers of the SSD and not the lower to make it look good. The 2tb and 4tb perform the speeds they advertise just not the lower ones.
 
Another one of these threads...

The speeds the OP posted are EXACTLY what you should be getting for the 512gb size. Nothing you do will change that.
 
I'm not in front of my 2018 15" right now so I'll just report what my 2017 13" 256 is getting: 1300 write / 2400 read. Seems to keep this number no matter the file size chosen.
 
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