overclocking a i5 Sandy Bridge??

Garfo

Garfo

Garfo

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Last edited:
Same chip as me :)

To strat with, yes you do need to go into the BIOS.

You need to find the settings to adjust the:

  • CPU multiplier
  • CPU voltage
  • CPU 'C states' 'Sleep States'
  • LLC (load line calibration)
  • Turbo (make sure its disabled)

Those are the main setting you need..

The BLCK needs to stay at 100.00, Sandybridge doesn't like that being changed.

What changes your CPU speed is the Multiplier. Youre core speed = Multiplier x BLCK...

So at stock the multiplier is 33 and the BLCK is 100.00 therefore the stock speed is 3300mhz..

If you increase the multiplier to 40 you get 4Ghz and so on.

The hardest thing about overclocking is the voltage.. To ensure presicion and not melting anything you should manually set this.

Once your CPU multiplier and voltage (along with LLC, we'll go through that later) are set you need to boot into windows and check your settings using CPU-Z. This should display your core speed and voltage. TO ensure the overclock is stabel you need to stress test. the most common is prime95 (runs the CPU at 100%). When running this you need to monitor your temps and voltage..

You must make sure:

  • Your voltage doesn't exceed 1.38v (1.40v)
  • Temps don't exceed 75C

These be the basics.

Let me know what sort of overclock you're going for an we'll talk about specific settings (once you understand this :))
 
You must make sure:
Your voltage doesn't exceed 1.38v (1.40v)
Temps don't exceed 75C
Click to expand...

a bit over cautious but yes pretty much.


Oh and Enable XMP if your memory allows it.
 
is that xmp in bios settings?

got it running @ 4.5 mhz at mo core voltage 1.336 V

temp is 41,40,38,37 will report more after more testing :)
 
Garfo said:
is that xmp in bios settings?

got it running @ 4.5 mhz at mo core voltage 1.336 V

temp is 41,40,38,37 will report more after more testing :)
Click to expand...

XMP is in the BIOS i think. :)

Those are idle temps, its load temp and voltage which are important, get prime running. :)
 
looks good to me. :)

Have you tried Prime95, thats better for stability. Just 30 minutes of blend test needed. :)

Also (a cosmetic point) change your BLCK in the BIOS to 100.02 (i know i said dont touch it but this will make sure it read 450x mhz rather than 449x mhz.. :)

Temps look good. :D
 
just ran crysis 3 on full for 2 hours all seems cool no bsod or nothing so am well happy now my 1st cpu overclock yay :)
 
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