Performance difference between 512 and 1 TB flash drive in iMac?

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i'm debating on whether 512 gb or 1 tb internal flash drive retina imac i'm order.

i'm going hook thunderbay iv plenty of storage, don't think need full 1 tb internal drive (since ever have os x , apps on it).

if 1 tb drive faster 512 gb, might consider it. stuff gets expensive, want smart spend upgrade $$.
 

found answered own question:

http://www.barefeats.com/haswel2.html

looks performance difference between 256/512/1 tb flash drives negligible, except in case of small random writes, 512/1tb outperform 256 (but not difference between 512/1tb).
 


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