UPDATE: ALL DOWNLOADS LISTED IN THIS POST FOUND HERE.     Nvidia 'Kepler' GPUs - modified VBIOS files   >>> NOTE: More versions (including voltage mods) exclusive for T|I users can be found in the second post. <<<         The 'Kepler' GPUs from Nvidia perform really well, even at increased clocks speeds they stay quite cool - a perfect behavior when it comes to overclocking and improving the performance.   Unfortunately the mobile GPUs suffer from an artificial +135MHz core overclocking limit, so you can't go higher by using tools like Nvidia Inspector and similar.   The modified VBIOS files listed here have this limit unlocked, some have increased stock clocks or tweaked voltages. Just refer to the description.   All files have been modified by myself, if you like them feel free to buy me a drink, donation link can be found below     GTX 660m:     660m_OC_edition__VBIOS_[DELL].zip- comes with unlocked software overclocking limits 660m_GHz-Edition_overvolted_VBIOS_[DELL].zip - default 3d clock 1000MHz, base boost 1200MHz,, memory (3d) 1350MHz, increased 3d voltage undervolted editions possible, depends on interest, tba   Some screenshots:       GTX 680m:     Clevo_680m_-_80.04.33.00.10_'OCedition'_revised_01.zip Dell_680m_-_80.04.33.00.32_'OCedition'_revised_00.zip       Increased software overclocking limits & optimized for no throttling. Read the included 'Read me' file before flashing.       Instructions:     I recommend flashing under DOS using nvflash .   Donation link   in case you want to buy me a beer Thanks and cheers!   More to come.   Testers: Thanks @eliteone (Dell 660m), @littleone562 (Dell 680m) For all mods: Use at your own risk.