Amiga frequencies in NTSC

[Daff]

Hello,

When reading different articles and docs about the Amiga 500/600/CDTV, etc. we can see there are two different frequencies for the 68000 in NTSC Amiga models : 7,14 MHz and 7,16 MHz (7,15909).

The master clock in NTSC models is 28,63636 MHz which is divided by 4 : so we have 7,15909 MHz for the 68000 processor.

But a lot of articles say it's 7,14 MHz :
http://amiga.resource.cx/mod/a600.html
http://amiga.resource.cx/mod/a500.html
http://fr.wikipedia.org/wiki/Amiga_500
http://www.amiga-resistance.info/bboahfaq/index.php?sid=444372&lang=de&action=artikel&cat=7&id=1865&artlang=de
http://www.amiga-resistance.info/bboahfaq/index.php?sid=444372&lang=de&action=artikel&cat=7&id=1870&artlang=de
http://www.amiga-resistance.info/bboahfaq/index.php?action=artikel&cat=7&id=1863&artlang=de
etc.

Some says it's 7,16 MHz
http://en.wikipedia.org/wiki/Amiga_500
http://en.wikipedia.org/wiki/Amiga_1000

Even some articles says it's both :
http://www.amiga-resistance.info/bboahfaq/index.php?action=artikel&cat=7&id=1845&artlang=de

So my question is : which frequency is the good one ?