SSD Performance based on size?

[Nabby]

I'm looking at a new MBP and am thinking about getting an SSD in it. I'm curious to know if the performance is consistent across the SSD drives, regardless of size. i.e. Does a 128GB SSD perform as well as a 256GB SSD?

Thanks!

Nabby

 

[DWBurke811]

In theory, a larger drive will perform better than a smaller one if all else is equal. But how much is very dependent on what drive it is.

 

[reputationZed]

there is generally a performance falloff with the smaller SSd's ( 80 GB and smaller) as they typically use controllers with half the channels. Once you get over that gap I don't think size plays that big of a role.

 

[Nabby]

Very interesting. Thanks for the information!

Nabby

 

[AppleGoat]

I may be wrong, but what I've noticed is that's there's greater write than read speed variance between small and large drives.

 

[vmachiel]

In the case of the agility 2 OCZ, the one that I have, the specs were as followed:

40 GB:
Max Read: up to 280 MB/s
Max Write: up to 270 MB/s
Sustained Write: up to 200 MB/s

50-240 GB:
Max Read: up to 285MB/s
Max Write: up to 275MB/s
Sustained Write: up to 250MB/s

400-480 GB:
Max Read: up to 250MB/s
Max Write: up to 240MB/s
Sustained Write: up to 200MB/s

All models had: Random Write 4KB (Aligned): 10,000 IOPS
So the middle size class preforms better.