Integrated GPU memory - little help?

Hey guys, I have a little question :smiley:

I have i3 4160 procesor, AS ROCK H81M-DGS motherboard and 2x4 GB 1600 mhz DDR3 Kingstone ram.

i3 prospect says that max shared memory to GPU is 1,8 GB.

Motherboard prospect says that max shared memory is 1,8 Gb.

But in my BIOS I only found that max shared memory is 1 GB.

Why?

Iā€™m temporary working with integrated GPU, but next month I will buy some GDDR 5 GPU. :smiley: