Bottleneck - could it be the motherboard?

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Jul 26, 2009
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Hi everyone. I'm here because I recently purchased a 670, and it's not really living up to the pricetag. I suspect it's my motherboard's fault. My motherboard is pretty old. Anyway, here are my specs:

ASUS P8P67 (REV 3.0) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS (I would link to it but it's discontinued. Was $150 or so.)
i5-2500k @ 4.7, 1.36 vcore
670, OC doesn't really make any difference in framerate
2x4GB RAM @ 1600
1TB hard drive, crashes infrequently on certain folders or something but I don't think that's the issue really. I haven't really got around to fixing that, I'll probably just reformat the boot partition. but I don't think it's the issue anyway.

To give some perspective, I still get 30 fps in Sleeping Dogs during the day, and dips down to 15 in ME3 and 30 in AC:Revelations when it has to load big areas.