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How to Overclock an LGA1155 CPU

The Internet has been alight with rumours that the new LGA1155 CPUs arent overclockable, that the CPUs arelocked and that this is the end of PC enthusiasm as we know it. That isnt quite accurate, however, as differentSandy Bridge CPUs have different overclocking capabilities.

However, overclocking via the Base Clock is severely limited, due to the constraint of having every bus derive itsspeed from a single clockgen. We saw a Base Clock overclock of 5MHz from the standard 100MHz producecrashes and lock-ups; even Intel says that its highly unlikely that youll see the Base Clock of an Intel 6-seriesmotherboard overclock by more than 10 per cent.

Overclocking Sandy Bridge is as simple as that... Glad we're here to help, now?

Overclocking is still possible via the CPU multiplier, but only a P67 motherboard will allow this. Standard SandyBridge CPUs can be made to Turbo Boost a little higher than normal if you have a sufficiently powerful cooler, whileK-series CPUs have a practically unlocked CPU multiplier (its limited to 57x, which is higher than anyone butcompetitive overclockers will ever see).

If you want the most performance for your money, a Core i5-2500K is the best CPU at the moment. Weve compileda step-by-step guide to overclocking the CPU from 3.3GHz to 4.5GHz, a safe everyday level, in Asus, Gigabyte andMSI motherboards (article coming soon), however here's the basic guidelines suitable for all boards:

Overclock a Core i5-2500K to 4.5GHz

1. Enter the BIOS by pressing Delete as the PC starts2. Enter the Advanced menu by clicking the button in the top-right corner3. Set the CPU multiplier to 45x4. Enable Load-Line Calibration5. Set the CPU voltage to 1.3-1.35V6. Set the CPU PLL to 1.9V

7. Set the VCCSA to 1.1V8. Set the VCCIO to 1.106V9. Hit F10 to save and restart

Overclock Settings for this Article

DefaultFrequency

OverclockedFrequency

Other AdjustedFrequencies

Settings Used

Intel Corei7-980X EE

3.33GHz (25 x133MHz)

4.4GHz (22 x200MHz)

RAM: 1,600MHz CPU: 1.38125V, CPU PLL: 1.96V,QPI: 1.375V, IOH: 1.3V, ICH: 1.2V

Intel Corei7-950

3.06GHz (23 x133MHz)

4.3GHz (23 x187MHz)

RAM: 1,499MHz CPU: 1.468V, CPU PLL: 1.94V,QPI/DRAM: 1.306V, IOH: 1.22V,ICH: 1.3V

AMD PhenomII X6 1100T BE

3.3GHz (16.5 x200MHz)

4.2GHz (14 x300MHz)

RAM: 1,500MHz, HTLink and CPU/NB:2.4GHz

CPU: 1.512V, CPU/NB: 1.35V, HT:1.35V, Northbridge: 1.3V,Southbridge: 1.2V

Intel Corei7-2600K

3.4GHz (34 x100MHz)

4.8GHz (48 x100MHz)

RAM: 1,600MHz Extreme Load-Line Calibration,CPU: 1.35V, CPU PLL: 1.9V,VCCSA: 1.1V, VCCIO: 1.106V

Intel Corei5-2500K

3.3GHz (33 x100MHz)

4.9GHz (47 x104.7MHz)

RAM: 1,675MHz Extreme Load-Line Calibration,CPU: 1.35V, CPU PLL: 1.9V,VCCSA: 1.1V, VCCIO: 1.106V

MORE ABOUT...

lga1155 overclocking recommended

sandy bridge

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Intel Core i5-655K Review

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w to Overclock an LGA1155 CPU | bit-tech.net http://www.bit-tech.net/hardware/cpus/2011/01/03/intel-sandy-bridge-r...

2 27/07/2011 18:57