U pravu si, moja greška. U priručniku A780GXH/128M piše:
"Multi Monitor Feature
This motherboard supports multi monitor feature. With the internal VGA output support (DVI-D, D-Sub and HDMI), you can easily enjoy the benefits of multi monitor feature without installing any add-on VGA card to this motherboard. This motherboard also provides independent display controllers for DVI-D, D-Sub and HDMI to support multi VGA output so that DVI-D, D-sub and HDMI can drive same or different display contents.
To enable multi monitor feature, please follow the below steps:
1. Connect DVI-D monitor cable to VGA/DVI-D port on the I/O panel, connect D-Sub monitor cable to VGA/D-Sub port on the I/O panel, and connect HDMI monitor cable to HDMI port on the I/O panel.
2. If you have installed onboard VGA driver from our support CD to your system already, you can freely enjoy the benefits of multi monitor function after your system boots."
Prema ovome bilo je za pretpostavit da se mogu spojiti tri monitora istodobno, međutim ništa od toga. AMD 780G čipset podržava samo dual-display kombinaciju DVI/HDMI + VGA.