It is known that standard computer resolutions are in the 4:3 ratio such as 640x480, 800x600, 1024x768 etc.

However there is one peculiar resolution which is 1280x1024.
This resolution does not seem to follow the standard, it is 5:4. By right to satisfy the ratio, it should be 1280x960. Despite this, this resolution seems to fairly common especially in 17 inch LCD monitors.

Can anybody enlighten me on this one?

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3.06GHZ 524 HT EM64T 533 MHz, 1024 MB RAM PC4200 DDR2, 160GB 7200RPM HDD, Nvidia Geforce 6200SE TC 256MB, Sound Blaster Live! 5.1, Logitech G15 keyboard, Razer Diamondback mouse, Windows XP Home SP2, OpenSuse 10.2