You may think there are no issues but when it comes to 100% data integrity its near impossible to get 99% matching data transfer, even at 2x. it's just what happens when you burn CD's.
Anyway, it may matter as if the topic starter is using the windows one, they need to set it in their driver properties rather than the burning wizard.
You do this by:
Open My computer
Right Click your Burner/Writer and select properties
On the recording tab it is by default set to "fastest"
change this to your new preferred value