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What is the maximum External LO input Frequency for AD9371?

Hello,

I am not sure what is the maximum external LO input frequency can the AD9371 can accept.  

On Page 55, the datasheet Rev. B mentions The AD9371 provides two external LO inputs to allow an external synthesizer to be used with the device. These inputs must be 2× the desired LO frequency. Note that operation for the external LO option is limited to a maximum of 4000 MHz.

However on Page 7, the datasheet states 8000MHz as the maximum frequency.   

The intention is to use a DDS to supply the external LO to the AD9371.  The input signal is between 4 to 5GHz. 

Can someone please confirm the maximum external LO frequency that can be accepted by the AD9371?