CC1310: CC1310 Tx Boost Mode

Hi,

1. If we are not using Boost Mode, the internal DC-DC Converter could be kept unused right ?
2. How will the Boost Mode in CC1310 affect the power consumption ?   ( In the CC1310 DS, it is given that, using Boost Mode will increase the VDDR to 1.95V and VDDS must be above 2.1 V in 434 MHz band )
3.  In the 400 MHz band what is the maximum power output we could achieve without using Boost Mode ?

Thank you in advance for any help you provide.