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macpokerstars

macrumors regular
Original poster
Sep 29, 2010
101
1
I have an iMac 5k Late 2015, and I already have a 512GB (MZ-JPV512...) in it.
I'm thinking of changing it to the 1TB version (MZ-KPV1T...).

I saw somewhere than the 1Tb one achieve 1500MB/s, but I can achieve about 1900 with my current 512GB blade.

Is the 1Tb slower, or faster, or same in terms of speed as the 512GB equivalent?
 

wardie

macrumors 6502a
Aug 18, 2008
551
179
I’ve got 1TB SSD in my 2017 5k iMac and it benchmarked just under 2000MB/s from what I remember when I first got the machine and cared. Echo the above comment I doubt you’d notice unless you have some particularly sensitive use case.
 

madmin

macrumors 6502a
Jun 14, 2012
693
4,024
My 2TB SSD 2017 iMac benchmarks 1900MB/s Write and 2600MB/s Read.
 

maflynn

macrumors Haswell
May 3, 2009
73,613
43,611
I agree the speed differences are such that the human eye, so to speak wouldn't notice.
 

danielwsmithee

macrumors 65816
Mar 12, 2005
1,135
410
I have an iMac 5k Late 2015, and I already have a 512GB (MZ-JPV512...) in it.
I'm thinking of changing it to the 1TB version (MZ-KPV1T...).

I saw somewhere than the 1Tb one achieve 1500MB/s, but I can achieve about 1900 with my current 512GB blade.

Is the 1Tb slower, or faster, or same in terms of speed as the 512GB equivalent?
No they aren't slower or faster. In the early days of SSDs larger SSDs meant faster because larger almost allways meant having more data interface between the controller and flash.

Once you get above capacities of 128-256GB, you rarely ever see any speed difference between capacities as they are almost always IO bandwidth or controller performance bound at that point.
 
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