GIGABYTE G1.Sniper Z97


GIGABYTE G1.Sniper Z97 OC-Guide

This guide is an example how to overclock your CPU using an GIGABYTE G1.Sniper Z97 motherboard. This guide is following the instructions given in the general Intel Haswell OC-Guide.

This example was done using a i7-4690K CPU. You can apply the same settings if you use any other K-Suffix CPU such as 4670K, 4770K or 4790K.


  • ASUS Z97-Pro Gamer
  • Intel Core i7-4690K
  • 2 x 4 GB DDR3 2400 C10
  • Noctua NH-U12S CPU cooler
  • Sea Sonic Platinum Series 1200 W


  • Windows 7 x64 Service Pack 1
  • CPU-Z
  • Core Temp
  • Prime95

You can download the required software here:

CPU-Z 1.71 Setup EN
1.50 MB | 2019 downloads
CoreTemp 1.0 RC6
717.26 KB | 8960 downloads
Prime 95 v28.5 64-Bit
15.39 MB | 29742 downloads
Prime 95 v28.5 32-Bit
4.13 MB | 1126 downloads


Basic video OC-Guide for overclocking to 4.3 GHz:


Please keep in mind that the voltages for your CPU might differ from this example. If your CPU core is not stable at these settings and you don’t exceed 90 °C core temperature, try to raise the CPU core voltage.


Important BIOS Settings explained:

Processor Base Clock (Gear Ratio)

The Gear Ratio (or BCLK Strap) is an additional multiplier to increase the base clock. Stock is x1 but if you e.g. selext x1.25, the BCLK will have an eventual value of 125 MHz.

CPU PLL Selection

LC PLL works best for low/stock clock BCLK of 100 MHz. LC PLL is and inductor capacitor based oscillator for low noise but only for a low range. If you overclock the BCLK, change to SB PLL or simply leave on auto.

Filter PLL Level

This is only needed for very high BCLK of over ~167 MHz. Just leave this setting on auto.

Host/PCIe Clock Frequency

The Base CLocK of your system. This frequency is tied to the PCIe clock and the DMI bus. High frequencies can cause your system to be unstable. Use the BCLK/CPU Strap for high BCLKs. Raising the BCLK will also raise the CPU core, ring and RAM frequency.

CPU Clock Ratio

This setting will change the CPU multiplier of your system. If you run a BCLK of 100 MHz and select 37 here, your CPU will run at 3700 MHz core frequency.

Uncore Frequency

This will set the CPU cache/ring ratio. If you run a BCLK of 100 MHz and select 35 here, your CPU cache/ring will run at 3500 MHz.


System Memory Multiplier

The DRAM Frequency is the result of the BCLK and an the System Memory Multiplier. E.g. 100 MHz BCLK and 18.66 multi will result in 1866 MHz RAM frequency. Higher than 2933 MHz usually doesn’t work. If you want to achieve higher memory frequencies, you have to use a different BCLK strap.


CPU Vcore

This is the core voltage of your CPU. Increase this voltage if you want to achieve higher core clocks. Usually more than 1,35 Volt is not recommended for daily use.

CPU Ring Voltage

This is the cache/ring voltage of your CPU. Increase this voltage if you want to achieve higher core clocks. Usually more than 1,15 Volt is not recommended for daily use.

CPU Graphics Voltage

The GPU Graphics Voltage is tied to the internal graphics processor (HD 4600 for 4770K). Only change this if you use the internal graphics processor and if you want to overclock it.

CPU System Agent Voltage

This voltage is important to run high memory clocks. Stock is 0.85 Volt and usually you don’t need more than 1.00 Volt for 24/7 systems.

CPU Digital I/O Voltage

This voltage also helps for memory overclocking. Stock voltage is about 1.0 Volt. More than 1.15 Volt is not recommended for daily use.

CPU Analog I/O Voltage

This voltage also helps for memory overclocking. Stock voltage is about 1.0 Volt. More than 1.15 Volt is not recommended for daily use.


CPU VRIN External Override 

CPU Input Voltage during the power on self test (POST).


DRAM Voltage

The DRAM Voltage is the Voltage of your memory. Check the memory modules for the specified voltage. Most are between 1.35 and 1.5 Volt. The official limit according to Intel is 1.5 Volt, however 1.65 Volt modules are no problem at all according to my testing.

PCH Core Voltage

This is the chipset voltage and doesn’t have to be changed since it doesn’t help in any way.


VTTDDR Voltage

This voltage always has to be 50% of the DRAM voltage. So if you use 1.5 DRAM Voltage, this one has to be at 0.75 Volt. Simply leave VTTDDR Voltage on auto because all boards apply the correct value automatically.



CPU EIST Function

Intel SpeedStep (EIST) will downclock your CPU in idle to save energy. I recommend to disable this feature because you only save about 2-5 W, but it can cause your system to be unstable when overclocking.

Intel (R) Turbo Boost Technology

Disable on GIGABYTE Motherboards to enable a permanent, maximum clock.

CPU C-States

The C-States are another energy saving option which I recommend to disable for maximum overclocking.

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  • Agip


    Im wonder how exactly to Disable the “Spread Spectrum” for Gigabyte Z97 board
    I can only give option AUTO & 0.1%, 0.2% etc and further but no word Disable


  • Joseph

    I have the g1 gaming sniper z97 board, and an i5-4690k.

    I did everything suggested in the video, and i ended up with a 1.310 voltage because my NH-D15 can keep it cool, and a core base clock thingy of 4.5

    My question is, if i run Prime on small fft i cusp at 90c on only one of the core. When i run 1344 just for stress testing, i’m no where near 90C. Which temperature should i go by? because i wouldn’t mind going higher than 4.5, and can i still turn turbo boost back on?

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