Shain Taylor :
I think it could be your CPU overheating. Download a program called HWmonitor or coretemp and post your temps when on idle and playing games...
I don't know if I copied the correct thing but here you go, this is my temperatures while playing one of my games.
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Hardware Monitors
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Hardware monitor ITE IT8728
Voltage 0 1.07 Volts [0x59] (CPU VTT)
Voltage 1 3.25 Volts [0xA4] (VCC3)
Voltage 2 11.81 Volts [0xA4] (+12V)
Voltage 3 3.46 Volts [0xAD] (+VCC)
Voltage 4 2.23 Volts [0xBA] (vAXG)
Voltage 5 1.10 Volts [0x5C] (CPU VCORE)
Voltage 6 1.52 Volts [0x7F] (DRAM)
Voltage 7 3.38 Volts [0x8D] (+3.3V)
Temperature 0 34°C (93°F) [0x22] (TMPIN0)
Temperature 1 127°C (260°F) [0x7F] (TMPIN1)
Temperature 2 51°C (123°F) [0x33] (TMPIN2)
Fan 0 1870 RPM [0x169] (FANIN0)
Fan 1 745 RPM [0x38A] (FANIN1)
Fan PWM 0 0 pc [0x0] (FANPWM0)
Fan PWM 1 0 pc [0x0] (FANPWM1)
Fan PWM 2 0 pc [0x0] (FANPWM2)
Register space LPC, base address = 0x0A30
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Hardware monitor ACPI
Temperature 0 28°C (82°F) [0xBC2] (TZ00)
Temperature 1 30°C (85°F) [0xBD6] (TZ01)
Hardware monitor NVIDIA NVAPI
Voltage 0 0.99 Volts [0x3DB] (VIN0)
Temperature 0 70°C (158°F) [0x46] (TMPIN0)
Fan 0 1710 RPM [0x6AE] (FANIN0)
Fan PWM 0 43 pc [0x2B] (FANPWMIN0)