Yep, when ESRT2 enabled, BIOS doesn't display HDD info but when i chose Enhanced or AHCI mode, the HDD consist 801.5 GB which is not correct. 
Then, when i use ESRT2 utility, the hdd still display 763893 MB 
And for update Intel RST ( Download Center), no luck, because it's said "This computer does not meet the minimum requirements for installing the software. Setup will exit."
For the hdd i used, ST3000DM001 (http://www.seagate.com/files/staticfiles/docs/pdf/datasheet/disc/desktop-hdd-data-sheet-ds1770-1-1212us.pdf), it used 4K sector.