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sparksd

macrumors G3
Jun 7, 2015
9,989
34,234
Seattle WA
I just ran Jazz Disk Lite on my 512GB M1 12.9 -

Sequential
Read: 3261.15 MB/s
Write: 1155.75 MB/s

Random (4K)
Read: 52.24 MB/s
Write: 39.83 MB/s
 

EugW

macrumors G5
Jun 18, 2017
14,878
12,855
That’s some very high speeds for a 512GB compared to the 1TB!?
In the old days the 512 GB was often similar to the 1 TB, but with these devices and this test, there seems to be a lot of variability. The 256 GB is the only one that is consistently slower (albeit still at a very decent speed).
 

aevan

macrumors 601
Original poster
Feb 5, 2015
4,537
7,235
Serbia
My M1 256 has a significantly faster SSD in the Jazz benchmark than my current M4 256, however there is literally no practical difference during work. Even copying files from an external SSD feels the same.

I guess it doesn’t really matter.
 
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Randomii

macrumors newbie
May 1, 2024
22
69
My M1 256 has a significantly faster SSD in the Jazz benchmark than my current M4 256, however there is literally no practical difference during work. Even copying files from an external SSD feels the same.

I guess it doesn’t really matter.
It matters for sure in more intensive apps that constantly stream data to/from SSD
 

rui no onna

Contributor
Oct 25, 2013
14,915
13,259
It matters for sure in more intensive apps that constantly stream data to/from SSD

Maybe if you were editing video. That’s not something one is likely to do on just 256GB storage though.

For the most part, it’s the random 4K that has bigger performance impact.
 
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