Overclocking Results
Overclockikng with the new Sandy Bridge processors presents new challenges that many enthusiasts may not like. Intel pretty much locked down their new line of LGA 1155 cores and aren’t allowing users to overclock the CPU by increased the BCLK. The K series LGA 1155 processors have unlocked CPU multipliers, which seem to be the preferred way to get more performance out of these cores in turbo mode.
Here’s what we did to help us get the best overclock possible with the P67A-UD4:
- Left BCLK frequency at 100
- Increase CPU Ratio (The math for overclocking our i5-2500K is very simple because we just multiply the BCLK frequency (100) and the CPU Ratio (currently 45) to get the overall CPU speed (4.5GHz)
- Manually adjusted DRAM frequency to DDR3-1600
- Adjusted DRAM voltage to 1.65v
After making the changes above in the BIOS, I began incrementally increasing the CPU ratio. I started out at 40x, learned that the i5-2500K could handle more. I increased the CPU ratio to 45x and finally started seeing the core work harder during stability testing. At 47x, we began to see the core stability issues during our stress tests. After backing it down a bit, we were able to get a stable 4.59 GHz overclock.
This screenshot was taken when we achieved a 4.590GHz overclock on the Gigabyte P67A-UD4
CPU Speed | BCLK | CPU Multiplier | DRAM Frequency | DRAM Timings | CPU Voltage |
4.59GHz | 100.3MHz |
45x
|
1630 MHz | 8-8-8-24 1T | 1.38v |
Overclocking Results
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