PCI-E Clock increasing beyond 100Mhz?

[Five.Stars]

Hi there, I have recently put my 4790K back to stock settings (with XMP) as a result of slight instability and tbh it is fast enough for gaming. However have noticed that the PCI-E clock at times jumps up from 100Mhz with x44 multipler to 102.6Mhz still with the same multi to give a clock of 4516.5Mhz as opposed to the "stock" turbo of 4400Mhz. Can anyone explain this, as I have not done anything other than load default values then select XMP.

The system seems stable, so it isn't a huge issue, but would still be interested to know what would cause this. Will have to monitor via logs to see how frequently the PCI-E clock goes beyond 100Mhz or if it is just a spike.

 

[joeyjojo]

Either an error in that measurement program, or there is some sneaky BCLK overclocking going on.

 

[Rroff]

There are some internal multipliers/straps and stuff going on - some combinations of settings won't round down nice and exactly with all the buses, etc. - aslong as it is around 100MHz give or take a bit it won't cause an issue.