[SI-LIST] 6 layers PCB

Hi, 
I have a 6 layers PCB with this stackup : 

Top - Signal/ fill with GND 
Prepeg : 4.6
Int1 : ground plane
Core : 5.0
Int2 : Signal/ fill with PWR
Prepeg : 33.5
Int3 : Signal/ fill with GND
Core : 5
Int4 : Split power plane 3.3V/5V
Prepeg : 4.6
Bottom : Signal/fill with GND

The dimensions for the core and prepeg are in mils and my operating frequency 
is 100Mhz.

So do you think that I have to worry about the frequencies above 500Mhz because 
of the lack of power plane decoupling in my stackup? 

thanks.

 
   

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