Using a gigabyte 5870 ultra durable

http://www.gigabyte.com.tw/FileList/...ud-1gd_big.jpg

I own this version

http://www.newegg.com/Product/Produc...-316-_-Product

Do I have the reference or non reference one ?

EnableUnofficialOverclocking = 1 worked fine for me but theres one problem

Anyone seem to not able to unlock "Core Voltage (mV)" function ?

Switched to 1 in .cfg file still no luck

Afterburner 1.5.1

http://img706.imageshack.us/img706/568/msih.jpg

Does that mean I need to flash my 5870 or can am I not able to change my core voltage no matter what as I'm using a non-reference board..?