I'm one of those people that is really bothered by frame rates dropping below 60fps, tearing frames and stuttering. BF3 64 man servers require a solid setup to pull 60fps, especially at 2560x1440. CPU's and GPU's both get hammered, so I really hope that BF4 is more optimized that BF3 was/is.
My i5-2500 machine choked bad while my i7-3770k@ 4.4ghz box is 99.9% buttery smooth with the same settings and same GPU. Just because task manager doesn't show 100% cpu utilization, it doesn't mean that you're not experiencing a CPU bottleneck. MANY times I saw GPU utilization at 60-70% on with CPU utilization around 85% and frame rates below 60fps depending on the map and where I was looking. No such problems with the i7 box.