Resolution-and-Cable-BANDWIDTHS_Gb-sec

1680x1050 = 1,764,000 pixels
1,764,000 x 60Hz = 105,840,000 pixels per second
105,840,000 x 24 color bits per pixel = 2,540,160,000 bits per second, or 2.54 Gbits/sec
To get values for 120Hz, merely double the 60Hz values. So:

1680x1050@60Hz = 2.54 Gbits/sec
1920x1080@60Hz = 2.99 Gbits/sec
1920x1200@60Hz = 3.32 Gbits/sec
Single-link DVI effective data rate: 3.96 Gbits/sec
1680x1050@120Hz = 5.08 Gbits/sec
2560x1440@60Hz = 5.31 Gbits/sec
2560x1600@60Hz = 5.90 Gbits/sec
1920x1080@120Hz = 5.97 Gbits/sec
1920x1200@120Hz = 6.64 Gbits/sec
Dual-link DVI effective data rate = 7.92 Gbits/sec
HDMI 1.3/1.4 effective data rate = 8.16 Gbits/sec
DisplayPort 1.0/1.1 effective data rate = 8.64 Gbits/sec
2560x1440@120Hz = 10.62 Gbits/sec
2560x1600@120Hz = 11.80 Gbits/sec
Displayport 1.2 effective data rate = 17.28 Gbits/sec
HDMI Type B effective data rate = 20.40 Gbits/sec

If I have made any errors, let me know. I am not 100% certain about some of the maximum speeds for the cables - I have read that effective data rates are 80% of symbol rates, and I only want to list effective data rates.

I have read that AMD video cards started using Displayport 1.2 with the 6000 series, and that Nvidia cards generally don't use Displayport and those few that do are still at 1.1. HDMI B has not been seen on consumer devices.

Going by my list, 1920x1080 and 1920x1200 should be possible on Dual-Link DVI, HDMI 1.3 and Displayport 1.0 and up.

Edit:

Those values don't include blanking.

1920x1080 @ 60 Hz is typically 2200x1125 @ 60 Hz = 3.564 Gbps or 148.5 MHz pixel clock
1920x1200 @ 60 Hz CVT-RB would be 2080x1235 @ 59.95 Hz = 3.696 Gbps or 154 MHz pixel clock
1920x1200 @ 120 Hz would need to be 2080x1271 @ 120 Hz = 7.614 Gbps or 317.25 MHz pixel clock

That should still fit within dual-link DVI, which is 2 x 165 MHz links = 330 MHz.