Yeap it's a coil while, my father doubled on that, he's an electronist he knows his coils 😛 I tested with GPU-Z in one window and Internet Explorer in the other while scrolling in this page and here are the results :
Test 1 : IE smooth scrolling ON , Windows 7 Aero Theme ON,--> GPU clocks raise to max values, GPU load max 33%, VDDC voltage raises from 0.950 V to 1.090 V while scrolling, GPU temp raises from 36º to 46º --> coil whine YES
Test 2 : IE smooth scrolling OFF, Window 7 Aero Theme ON --> no voltage change, no temperature change --> coil whine NO
Test 3 : IE smooth scrolling ON , Windows 7 Aero Theme OFF (Windows 7 Basic theme on) --> GPU clocks raise to max values, GPU load max 33%, VDDC raises from 0.950 V to 1.090 V while scrolling, GPU temp raises from 36º to 46º --> coil whine present but inaudible for most humans
Test 4 : IE smooth scrolling OFF , Windows 7 Aero Theme OFF --> GPU clocks at minimum(157,300 MHz), GPU load max 10%, no voltage change, no temperature change --> coil whine NO
Conclusion? Use the chinese water torture on the maker(s) of the video card and on the maker(s) of IE smooth scrolling 😀