Where did you get 16.7M from?
From your quoted article entry at TFT .
" ... Like the new 24" model this screen seems to be aimed more at professional and higher end colour critical work. Along with the wide gamut support the screen comes factory calibrated with a deltaE of <2, offers 6-axis colour adjustment, 10-bit colour support (
1.07b colours - again likely 8-bit + FRC) and features a programmable hardware 14-bit LUT. ... "
http://www.tftcentral.co.uk/news_archive/27.htm#dell_u2713h
From Dell's website on the tech specs
" ...
Color Support:
Color Depth: 1.07 billion colors
Color Gamut (typical): Adobe RGB 99%, sRGB 100% and 120% (CIE 1976)3
...."
http://accessories.us.dell.com/sna/...e_bnrank=0&baynote_irrank=0&~ck=baynoteSearch
Dell's entry for the U2711
"...
Color Support:
1.07 billion colors
...."
http://accessories.us.dell.com/sna/...e_bnrank=0&baynote_irrank=0&~ck=baynoteSearch
The "8 bits + FRC " means the 10 bits are dithered. But given there is only 3-4M pixels on the screen and a 14 bit color LUT internal to the monitor means this is far from the muddled approximation that "6 bits + FRC" dithered solutions presented on limited 6-bit TN panels of the past.
The 2713H is a slightly different IPS techonology ( there is a 0.002mm difference in pixel pitch) and is newer in the non-panel aspects. There is a mini Display Port ( on a Mac standard apple cables will work, since standardize on mini-DP). There are USB 3.0 ports. And the backlighting is LED ( so lower power. ).
There may be a difference in how they have applied the antiglare layer but even that specs out the same ("hard coat 3H" ) .
P.S. I think you may have mixed up the Dell U2713HM ( released a couple of months ago. ) that is limited to 16.3M (
http://www.tftcentral.co.uk/reviews/dell_u2713hm.htm ) . The "extra" 'M' isn't the better model.