I usually run my games at 1920x1080 and like to max everything out. I'm getting overall good FPS most of the time, but sometimes it gets really low.
For example, Skyrim w/high resolution texture pack everything maxed runs at about 40-60 FPS most of the time, but drops significantly at random times. Also, Batman: Arkham Origins runs about 20-35 FPS maxed out everything.
Am I getting bottlenecked by something? Or is this just normal for my hardware?
The hottest my CPU gets is 57 C at max load, 58 C max load for GPU.
Yes, the aging Phenom X4 and the slow DDR2 memory is probably dragging down your frame rate with games that are CPU demanding. Actually, I'm surprised you can run those other games maxed out at 1080p with the 2.6 GHZ Phenom x4.