This is a handy chart for figuring out the number of pixels. When you start getting into the larger 16:10 monitors, you really need a lot of horsepower. Add in three large monitors...
2400 x 600 . = 1,440,000 pixels | Triple 4:3
1680 x 1050 = 1,764,000 pixels | Single 16:10
1600 x 1200 = 1,920,000 pixels | Single 4:3
1920 x 1080 = 2,073,600 pixels | Single 16:9
1920 x 1200 = 2,304,000 pixels | Single 16:10
3072 x 768 . = 2,359,296 pixels | Triple 4:3
3840 x 720 . = 2,764,800 pixels | Triple 16:9
3840 x 800 . = 3,072,000 pixels | Triple 16:10
4080 x 768 . = 3,133,440 pixels | Triple 16:9
3840 x 960 . = 3,686,400 pixels | Triple 4:3
4320 x 900 . = 3,888,000 pixels | Triple 16:10
3840 x 1024 = 3,932,160 pixels | Triple 5:4
2560 x 1600 = 4,096,000 pixels | Single 16:10
4200 x 1050 = 4,410,000 pixels | Triple 4:3
5040 x 1050 = 5,292,000 pixels | Triple 16:10
4800 x 1200 = 5,760,000 pixels | Triple 4:3
5760 x 1080 = 6,220,800 pixels | Triple 16:9
5760 x 1200 = 6,912,000 pixels | Triple 16:10