Voici un petit résumé niveau température avec HWMonitor, j'ai mis en gras les températures CM/CPU/GPU durant une balade en Partie Libre. Je pense que 8Go de RAM c'est vraiment ce qui rekt mon PC, impossible de donner un coup de souris sans freeze 5s... 
Hardware monitor Nuvoton NCT6791D
Voltage 0 5.08 Volts [0x7F] (+5V)
Voltage 1 3.18 Volts [0xC7] (+3.3V)
Voltage 2 11.90 Volts [0x7C] (+12V)
Voltage 3 1.06 Volts [0x85] (VIN3)
Voltage 4 0.16 Volts [0xA] (VIN4)
Voltage 5 1.30 Volts [0x51] (VCORE)
Voltage 6 0.98 Volts [0x7B] (VIN6)
Voltage 7 1.92 Volts [0x78] (VIN7)
Temperature 0 33 degC (91 degF) [0x21] (Mainboard)
Temperature 1 63 degC (145 degF) [0x3F] (CPU)
Temperature 2 33 degC (91 degF) [0x21] (TMPIN2)
Temperature 3 45 degC (113 degF) [0x2D] (TMPIN3)
Temperature 4 40 degC (104 degF) [0x28] (TMPIN4)
Temperature 5 15 degC (59 degF) [0xF] (TMPIN5)
Temperature 6 22 degC (71 degF) [0x16] (TMPIN6)
Fan 0 1283 RPM [0x503] (Chassis #1)
Fan 1 2160 RPM [0x870] (CPU)
Fan 3 1190 RPM [0x4A6] (Chassis #3)
Register space PMIO, base address = 0x0A00
Hardware monitor ACPI
Temperature 0 28 degC (82 degF) [0xBC2] (TZ00)
Temperature 1 30 degC (85 degF) [0xBD6] (TZ01)
Hardware monitor D3D
Hardware monitor Intel I/O
Temperature 0 52 degC (125 degF) [0x34] (GPU)
Clock Speed 0 0.00 MHz [0x0] (Graphics)
Hardware monitor D3D
Hardware monitor NVIDIA NVAPI
Voltage 0 1.01 Volts [0x3EE] (GPU)
Power 0 74.01 pc (GPU)
Temperature 0 82 degC (179 degF) [0x52] (GPU)
Fan 0 2335 RPM [0x91F] (GPU #0)
Fan PWM 0 56 pc [0x38] (FANPWMIN0)
Clock Speed 0 1151.72 MHz [0x47F] (Graphics)
Clock Speed 1 3505.50 MHz [0x47F] (Memory)