StrikeCombo

So im plannig on buying the alienware 240hz montior with amd freesync i have a gtx 1070 and a i5 8600k and im not sure if it will work will i be able to play on 240hz and will i be able to use gysnc more important is i can get get all the 240hz

so i got my new headphones a week ago,from ebay and since i started playing games i realized i hear upside down. so i hear sound from the left side to the right and from the right to the left when i need to hear from right side to right and left left. thanks for trying to help would like to get this fixed