With regard to OC'ing your msi gtx 760 TF, you might find this article interesting:
http://www.guru3d.com/articles_pages/geforce_gtx_760_msi_gaming_review,24.html
You should make sure your case is well ventilated and have an appropriately powered psu. This said here's the settings from the article:
"We found a very sweet tweak that will bring your boost frequency towards 1250~1306 MHz stable, it will fluctuate depending on power draw / limits. Feel free to try our settings yourself. We applied:
Power Target 145%
Priority set to temperature
GPU clock +125 MHz
Memory clock +375 MHz
Voltage +12 mV
Fan control RPM @ 65% "
With these tweaks they were able to achieve the following:
OC Base Clock: 1145 MHz
OC Boost Clock: ~1280MHz
OC Memory Clock: 6750 MHz
Hope this helps!