It looks like you have an integrated graphics card from ASUS. We're the same, I have a Intel HD Graphics 4000 from Acers website.
How bout try to check for updates with device manager? Heres how
Go to Device manager > click Display Adapters > Click your Intel Graphics Driver > Then click Driver > Then click update driver > Then choose "Search automatically for updated driver software "
Hope this helps.
Just in case you can download the driver for your graphics controller at this link:
If you have problems during the installation try these steps:
I've mentioned before that I installed the latest version of this driver from Intel's site,installed. Then all apps including GPU-z , CPU-Z started to show half of my memory.But windows showed my actual graphics memory (around 1750MB)..But cpu-z and such apps show half..look at the pic below:
But While I installed the older driver provided by Asus.. All these sofwtares showed correct info..See the pic below: