my ssd speed is weird

Mizo Zizo

Reputable
Mar 23, 2014
65
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4,660
i purchased a crucial 120 gb m-sata ssd drive . i wanted to install it on my msi gt70 dominator .but it couldn't be installed because i didn't have a m-sata slot .
so after a lot of searching for a solution , i bought ana adapter than converts the m-sata to normal ssd size so i can install it in the empty bay of my laptop
after i installed it and windows recognized it , i ran an AS SSD speed test , these were the results :

now the fastest read speed was 472 mb/s .
isn't it supposed to be 600 mb/s ? or is it because i installed the ssd on a secondary bay which it's speed might be less ( like 3 mb/s ) ?
my ssd is this one :
http://www.amazon.com/CRUCIAL-Micron-Internal-memory-MTFDDAT120MAV-1AE12ABYY/dp/B00IJVKUOS/ref=sr_1_3?ie=UTF8&qid=1404429991&sr=8-3&keywords=crucial+m500+120gb+6gbps