when it shows "unknown" in the validation it's 4:3.
in the actual cpu-z memory tab the clock is greyed out then.
when it's 1:1 it shows the clock in both the validation and the cpu-z memory tab.
example for 1:1: http://valid.canardpc.com/show_oc.php?id=1500843
here it's 4:3 http://valid.canardpc.com/show_oc.php?id=1518762