1. NVIDIA Control Panel > Display > Manage custom timings.
2. Click both "Treat as HDTV" and "Allow modes not exposed by the display"
3. Click [Create...]
4. Under Custom display mode values:
Horizontal desktop pixels: 1440
Vertical desktop lines: 900
GDI Refresh rate: 60
Bits per pixel: 32
(don't have "Interlaced" checked)
5. Click [Advanced >>]
6. Under "Back-end parameters":
Timing standard: DMT
Desired refresh rate: 60
(the rest of the fields are grayed out)
7. Under "Front-end parameters"
Scaling type: Display (none)
8. Click [Test]
9. Click [OK]