Difference in clock MHz between X Server 1.5.2 & X.Org X Server 1.9.4

[SD]

Dear All.

I have ONE laptop with ONE hdd and 2 OS opensuse and fedora on it.
When I boot opensuse LCD picture is perfect but is not on fedora.
I spent many time to find differences and want to show you all this one:

X.Org X Server 1.5.2
Release Date: 10 October 2008
X Protocol Version 11, Revision 0
Build Operating System: openSUSE SUSE LINUX
Current Operating System: Linux linux-xmc2 2.6.27.45-0.1-pae #1 SMP 2010-02-22 16:49:47 +0100 i686
...
(II) intel(0): using SSC reference clock of 96 MHz


X.Org X Server 1.9.4
Release Date: 2011-02-04
[    22.536] X Protocol Version 11, Revision 0
[    22.536] Build Operating System: x86-06 2.6.32-71.14.1.el6.x86_64 
[    22.536] Current Operating System: Linux f14.fedora14 2.6.35.11-83.fc14.i686.PAE #1 SMP Mon Feb 7 06:57:55 UTC 2011 i686
...
[   135.556] (II) intel(0): Supported detailed timing:
[   135.556] (II) intel(0): clock: 65.0 MHz   Image Size:  304 x 228 mm


On OpenSuse, where I can use LCD clock is 96 MHZ, on Fedora it is 65 MHz.
Why?

Thanks.