- Under Settings on the XMB, select Display Settings.
- In the next menu, select Video Output Settings.
- Now select the type of cable you are currently using e.g. HDMI.
- Select the Custom option once prompted and untick all options except for 1080p
The game will now display in 1080p.
Note: Please remember to revert this setting when needed, if you do not, your non 1080p games will revert to standard definition.