The backside of the motherboard houses some more chips, including more onboard RAM.

4x Hynix h5TQ2G83CFR 2 Gb DDR3 SDRAM

2x Hynix h5TQ2G63DFR 2 Gb DDR3 video SDRAM

ITE IT8572G

3x Fairchild PC78T FDMC7696

Richtek RT8168B PWM Controller

Realtek ALC269 audio codec

So if our tally is correct, the UX32VD has a total of 1 GB onboard video RAM! (4 x 2 Gb = 8 Gb = 1 GB)