Depends if you have the gpu to drive 1080p at comfortable frame rates to begin with. But if you do, then yes 1080p will be prettier and give you less fps than 720p and end up congestioning that cpu less often, which makes it freeze and that's pretty much the worse that can happen in a game. Some games will give you more frames, despite the cpu % being lower than others, that's because every game is going to put a base load on the cpu, that load is determined by how heavy the game is, its physical size allocation in ram and on disc, how big the chunks of information in game are, how much AI the game has, shadow draws, ground clutter, population density etc... all these are typically commanded by the cpu. To all this is added your fps. Do not try to decrease the load of your cpu via reducing shadows, ground clutter and population densities ( Witcher 3 and GTA5 have these options ) because often it does remove load on the cpu, which means you get higher frame rate which in turn loads the cpu... it can work sometimes but so far i have never seen it be effective and you end up keeping the same stutters but losing out on eye candy.