WD5000AAKS transfer rate slow?

I just got my WD5000AAKS-00V1A0 which manufacture date is 2010-1-30 for my new PC. Motherboard is MSI 785GM-E65. I opened AHCI in BIOS, installed Windows 7 Basic and drivers from game.amd.com. But HDTune’s benchmark only got  read average about 65MB/s, which is more slower than reports on internet  about 100MB/s. Is there any problem - AHCI / 785g / KIS2010? Thanks.

And, when PC goes to sleep it cannot wake up, mouse and keyboard don’t work, have to reboot.

Solved.Just close AHCI.