Contradictory information between the Dell Support & manual - SATA ii Vs SATA iii

I scoured the search on the net with various keywords and found no solid documents on this subject.  So, I'm here to confirm if my laptop has capacity SATA 3.   According to the dell online repair (E6420 lattitude), this system comes with a Sata 2 SSD (which is what I have currently on my laptop).  I found a reference in my research where support DELL said clearly that this system is capable of SATA iii support.   See the links below for confirmation:

Dell thread support forum - final post shows Sata iii speeds are possible.

Moreover, I found people guess and SATA 3 SSD running on E6420.  The maintenance manual itself says nothing about the speed level (SATA 2 or 3).   Is it possible to confirm that people get SATA 3 speeds on this laptop?  I know that my new SATA 3 SSD is backward compatible with SATA 2.  My new Samsung EVO 850 SSD is capable of SATA 3, and I need to optimize it for higher speeds, if indeed I can confirm that this computer is able to reach SATA 3.

Currently, it is the speed that I see on my new SATA 3 SSD, without even running AHCI.

No help from this forum. So I wanted to publish my own answer, found through my upgrade and benchmarks.  Latitude E6420 is able to support SATA 3 speeds.  But you won't get the full benefit and the speed of SATA - iii if you run nothing less than Windows 7.

Tags: Dell Laptop

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