the alltime fps question (fx6300/gtx650)

[pilz]

Hi,i have a system with an amd Fx6300 and a nvidia gtx 650.
Im on the lowest grafik settings.

If i run arround to find enemies,my fps is by 55-60,showing gpu is bottleneck(i press alt+f ) showing the cpu usage in the taskmaneger(i made window mode to check it) by 20-40 %.

If im in combat,my fps gows sometimes down to 30,showing cpu is bottleneck,the taskmanager say my cpu usage is by 60-90%.

Have 8 gb ram,mainboard is a asus m5a87l-m/usb3

any tips to upgrade,or must i by a new high-end computer?