As on topic , on old F3 bios my SSD works full speed : 
--------------------------------------------------
CrystalDiskMark 2.2 (C) 2007-2008 hiyohiyo
      Crystal Dew World : 
http://crystalmark.info/--------------------------------------------------
   Sequential Read :  516.625 MB/s
  Sequential Write :  163.789 MB/s
 Random Read 512KB :  457.802 MB/s
Random Write 512KB :  152.722 MB/s
   Random Read 4KB :   32.213 MB/s
  Random Write 4KB :  132.208 MB/s
         Test Size : 100 MB
              Date : 2013/06/07 23:46:22
With F4 ... cut it to 50 % ( i back to old bios so cant post results atm )
Beside that is any chance to Gigabyte add suport full HD resolution on BIOS ? As is works only on internal Haswell graphic atm.... When i set on my main graphich card (PCIE 1 ) graphic is ridiculous ...  
Best Regards 
p.s. 
System dont boot on my mb if i connect fan to FAN2 slot ... no clue why .. any help ? no mather fan ,, i connected like 4 different