I would grab a new video card (I don't know what you have but it's presumably as old as the other parts) and see if the performance is sufficient for you. If not, then you could consider a new CPU/mobo and just move the video card to your new system.
For whatever reason I find Linux gets more fussy about overclocks than Windows. Since I work in the former and game in the latter, I do not OC my work PC. Spending any time chasing stability problems is a waste when I could be being productive.
I would try reinstalling your drivers... specifically, uninstall them, then use a tool like DDU (http://www.guru3d.com/files-details/display-driver-uninstaller-download.html) to wipe out any remnants, and then install the new drivers.
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