How do I get 16x on my Biostar TA790GX-128 ??

I am running a single Nvidia 9600GTX on this board and according to the insstruction manual, I am suppose to put the dummy card in PCIex #2 which is actually the TOP slot, and put the video card in PCIex slot #1 which is the bottom slot.

I did this, however, CPUz and GPUz are telling me that my card is running in 8x mode. In CPUz under the Mainboard tab, under graphic interface, then link width" it shows 8x, and under Max supported it says 16x.

I can't figure out how to get my single GFX card to run in 16x mode.

There are some BIOS settings, one being to disable onboard graphics which I did, but there is another that ask me to chose a certain order for GFX and it isnt explained in the manual.

Does anyone know how I can get this sigle 9600gt to run in 16x mode in the single slot?

Thanks

It is the Biostar TA790GX-128 board.

I have the board, it ran 16x
Just put the dummy on slave slot and my Sapphire 4830 on master slot,
It works for me..