This is offtopic, but: I am having also problem with the mic jack. Realtek HD audio recognizes that something was plugged in the jack, and I can choose "Mic in" from the the popup. But still, when going to recording devices, there is only the laptop builtin mic there and no new mics. No headset that I have tried has worked. And all of them work in another Win7Pro laptop. I asked about this in another thread and since no one else has reported the same issue, I am again suspecting this might be something that can be fixed with a clean install. After win 8.1 upgrade I had to install several drivers again, because the upgrade screwed something. For example nvidia drivers were not at all in Win10. Of the realtek drivers, I have tried several versions, including all the latest they release on their ftp. I have also tried the 8.1 versions and the windows HD audio, and nothing gets the headset mics working. But as the software recognizes something gets plugged in, I don't think it is a hardware issue.
As a curiosity, with your graphics performance, I would like to hear what kind of FPS you get in Planetside 2, if you have it installed? (Free to play, can find it in Steam).
Edit: Can you get core to the mentioned 1300-ish without modding vBios? I thought +135Mhz is the limit? Or is that limited by the tweaking softwares?