OC ABILITY REFERENCE
Now, taking the P67A-GD65 (B3) mainboard with the Intel’s latest Core i7
2600K CPU as an example, we will set Core Speed and Memory Frequency as
overclocking items to introduce some points and notices to users for refer-
ence.
Max CPU Core Speed
Learned from the LGA1156 platform experience, the Core i7 CPU’s Core
Speed can be overclocked to 4GHz approximately in air cooling condition.
But by the promotion of the 32nm manufacture process, even the Core i7
2600K CPU has four built-in cores, it can reach 5GHz merely in air cooling
condition; thus, attracting many overclockers.The key of the Core i7 2600K
CPU is CPU Ratio.
Because it is the CPU Ratio unlocked K version, you can direct tune the CPU
Ratio to raise the Core Speed despite the Base Clock and Dram Frequency.
CPU Voltage and CPU IO Voltage are two major factors for voltage adjust-
ment; certainly do not set them to excessively high values to avoid burning
down the CPU or the motherboard.
Demo system configuration
Motherboard P67A-GD65 (B3)
BIOS V1.0H
CPU Core i7 2600K D1
Memory Corsair CMGTX3 DDR3-2400
Graphics Card MSI Nvidia GeForce GTX470
HDD Intel SSDSA2MH080G2GC
PSU XIGMATEK NRP-HC1001 1000W
OS Windows 7 64-bit Ultimate RTM 7600
Note: Although the BIOS is the V1.0H Beta edition, but the function will be added into the official
edition.
• CPU Voltage:1.375V
• CPU IO:Auto
• Base Clock:100MHz
• CPU Ratio:50×
Reference setting ~ 5000MHz
Max Memory Frequency
Due to the limited BCLK OC range of the Sandy Bridge processors and the re-
strictions on memory ratio; e.g. the maximum ratio for 2600K is only 8 times.
Therefore, the maximum range for memory OC will be around DDR3-2133;
except with the support of Base Clock OC.
Thanks to the quality of DDR3 modules nowadays, as long as users buy bet-
ter DDR3 modules, it will not be difficult to boost the memory frequency
to DDR3-2133. Resembling the LGA1156 platform, the DRAM Voltage is the
main item for adjusting CPU IO voltage. After changing the Base Frequency,
it may be necessary to adjust the CPU Vcore and CPU IO Voltage.
• CPU IO Voltage:Auto • RAM Voltage:1.652V • RAM Ratio:8×
Reference setting ~ DDR3-2133
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