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This is from my 21.5".
3.1GHz i7-4770S
16GB RAM
256GB SSD
1GB GT750M
 

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Basic 21,5 Imac here with 256GB SSD
 

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The 2013 Fusion Drive should test close to the speeds as the 2013 Flash Modules as long as the 128G Flash portion is in play. However, when the "fused" flash module becomes full and overflowing, the speeds will drop precipitously as illustrated in the graph below from the 2012 Fusion Drive.

http://www.barefeats.com/haswel2.html
 
The 2013 Fusion Drive should test close to the speeds as the 2013 Flash Modules as long as the 128G Flash portion is in play. However, when the "fused" flash module becomes full and overflowing, the speeds will drop precipitously as illustrated in the graph below from the 2012 Fusion Drive.

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

On average, the Fusion drive operates at 350/520 MB/s write/read respectively. Nowhere near to that of a pure-SSD setup.
 
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