You may already know about this, but if you don't have the newer G750JH bios, it's possible a bios update can help some if you want to check this thread
New 208 JX and 205 JH BIOS on support.asus.com.
Just be aware that a failed bios flash can kill your system and cause it to stop working, so you may want to only try it when you can take this risk.
Also, this may not help too much, but if you are using the ASUS Power4Gear software, you may want to check its setting too.