you might end up with different results depending upon the timing table
There are a few different timing tables used to generate the EDID settings:
GTF / CVT / SMPTE

Take a look in a Datapath X4 output timing page, or Lightware matrix advance EDID editor…
or Google 'edid timing tables'
see page 76 of the following publication:
ftp://ftp.cis.nctu.edu.tw/pub/csie/S.../EEDIDrAr2.pdf
and
http://www.vesa.org/vesa-standards/standards-faq/


...Dont get me started about CEA extensions HDMI and new MacPros!

S