My scavenged OC system:
- Intel Pentium G3258 (3.2GHz, 1.01V)
- AsRock Z87E-ITX (v2.50)
- Noctua NH-L12 with single Scythe 120mm PWM fan
- Crucial Ballistix VLP 2x 4GB PC3-12800 (9-9-9-24)
- WD Green 1TB SATA HDD
- Sigmatek Nebula C with front and side panels removed, 1x 120mm Scythe PWM fan
- Fans set at "performance mode"
- Windows 7 x64 - basic install (including all drivers
- AIDA64 for checking basic stability/temps/volts
Some basic settings I've made to start:
CPU Ratio - All Core (so both cores get the same ratio)
BCLK - 100.0
Spread Spectrum - Disabled
Intel SpeedStep - Disabled
RAM - XMP Profile 1 (DDR3-1600 9-9-9-24 1.35V)
CPU Vcove Voltage Mode - Override (fixed voltage)
First step: Probing.
Temps are average CPU after 3 minutes of AIDA stability test. I'll be going from the default 1.01 to 1.30V, over 1.40V isn't recommended and I'd like to keep some options for the end stretch.
Fixed CPU voltage at 1.01V with 1.70V input voltage
- 32x100 at 1.01V --- ~38°C (default clocks)
- 36x100 at 1.01V --- ~43°C (3.6 GHz)
- 38x100 at 1.01V --- ~44°C (3.8 GHz)
- 40x100 at 1.01V --- ~45°C (4.0 GHz - 25% overclock)
- 42x100 at 1.01V --- No boot/POST
Fixed CPU voltage at 1.10V with 1.90V input voltage
- 42x100 at 1.10V --- ~49°C (4.2 GHz)
- 44x100 at 1.10V --- No boot/POST
Fixed CPU voltage at 1.20V with 1.90V input voltage
- 44x100 at 1.20V --- ~54°C (4.4 GHz)
- 45x100 at 1.20V --- ~57°C (4.5 GHz - 41% overclock)
- 46x100 at 1.20V --- Unstable
Fixed CPU voltage at 1.25V with 1.90V input voltage
- 46x100 at 1.25V --- ~64°C (4.6 GHz)
- 47x100 at 1.25V --- Unstable
Fixed CPU voltage at 1.30V with 1.90V input voltage
- 47x100 at 1.30V --- ~68°C (4.7 GHz - 47% overclock)
- 48x100 at 1.30V --- No boot/POST
Noteworthy: idle temps went from 28°C to 30°C going from 1.01V to 1.30V, didn't expect that with SpeedStep disabled ! C-states is still active so it must be responsible for this.
I'll update this post until I reached the limit with 1.30V for the CPU and without touching the other voltages or settings. EDIT: done, next !
