Why such of difference in speed?

I have the Sandisk Ultra 480g, Why am I getting burst speeds of 350mb and average of 300mb when Its advertised 550mb? I've used HDTACH and crystalmark to bench it. I'm using a SATA3 port, what gives? Thanks

Is this the MB you have? I cant find the exact part number you provided
http://www.gigabyte.com/products/product-page.aspx?pid=4139#sp 
If so this board looks like it has 2 different SATA 6Gb chipsets. One is Marvell and the other is not listed in the specs. You may want to try the SSD connected to both and see which gets better speed. The board also has SATA 3Gb ports so make sure you are not connected to one of those. 
AS for drivers check the MB manufacturers website and see if there are any updated drivers you can try. If the MB has an intel chipset use the intel RST AHCI driver. It has the best performance. If the board does not have an intel chipset you will have to use what the MB site provides or the Microsoft driver. 

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