I should have explained my last post a little clearer, sorry.
I think ultimately the chipset is bottlenecking your CPU/GPU.
I read a lot about the 61 vs 75 chipsets before making my choice of a second hand mobo, while I had the chance...
Without getting my hands on a 2/3rd gen "k" series CPU to actually try it I can't prove my mobo will overclock, but the available settings in the bios suggest you can change the multiplier on it.
That's how I understand it, you have a base clock that stays fixed, but the CPU multiplier can be raised a bit and if your RAM allows it, you can mess with that. My mobo has a whole bunch of RAM settings too, but the RAM sicks has to have the right code burned into it's "electrically erasable, reprogrammable rom" chip to clock that up as well.
Your GPU card is only probably running 2 gen speeds. As I understand it from researching it all. I think ?