Overclocking i5 3450 - Max Overclock and Voltage

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mercury529

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Aug 29, 2008
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Hello Everyone,

So I recently picked up an i5 3450 processor, Cooler Master Hyper 212 Evo, Asus P877-v Pro Mobo, and Corsair HX650 power supply. As I understand it, the 3450 has a limited unlock allowing for a multiplier up to 39. I had a few questions:

1.) With my current setup, is the max 4 core performance (without adjusting the bclk) limited to 3.7 Ghz, or is there a way to enable 3.9 Ghz with all 4 cores active? Are 2-core and 3-core limited to 3.7 Ghz as well?

2.) In the UEFI, I have the 1-core ratio limit, 2-core ratio limit, 3-core ratio limit, and 4-core ratio limit all set to 39. Is this optimal? I have seen some setups that do 39/38/37/37 or similar.

3.) I initially left the voltage set to auto. The processor was running at 1.1875v under load according to CPU-z. I have since manually tweaked it to 1.12v. So far it has been stable under 4 hours of Prime 95. Does this sound like a reasonable voltage for my current setup? I do find it surprising that the auto voltage overcompensates by such a large margin.

Thank you very much for any info you can share.

Edit:

In case anyone reads this later as a point of reference: after 4 hours of Prime 95, my max temps were 62/66/64/64 Celsius.
 
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1.) I was under the impression that you'll get the highest turbo speed with one core, and for every active turbo core after that the speed is dropped 100mhz. So 3.9Ghz, for 1 core, all the way down to 3.6Ghz with all 4 cores in turbo. This might not be accurate, its been awhile since I've read into it.

2.) I'd say if 39 works for all of them, no reason to change it. Also, you should put a load on all of the cores and open up CPU-Z and see what it is reporting your clockspeed at. I'm interested to hear if you can get 3.9Ghz with 4 cores.

3.) I have an i5-2500K and I've found that auto voltage does load up way more voltage than is necessary. Setting the voltage manually is definitely the way to go. There is no harm in lowering your...
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natedawg72

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Oct 15, 2012
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1.) I was under the impression that you'll get the highest turbo speed with one core, and for every active turbo core after that the speed is dropped 100mhz. So 3.9Ghz, for 1 core, all the way down to 3.6Ghz with all 4 cores in turbo. This might not be accurate, its been awhile since I've read into it.

2.) I'd say if 39 works for all of them, no reason to change it. Also, you should put a load on all of the cores and open up CPU-Z and see what it is reporting your clockspeed at. I'm interested to hear if you can get 3.9Ghz with 4 cores.

3.) I have an i5-2500K and I've found that auto voltage does load up way more voltage than is necessary. Setting the voltage manually is definitely the way to go. There is no harm in lowering your voltage, so I'd take it as low as you can while keeping things stable. Find your limit, and then bump it up a notch or two. Your PC may not boot if you set the voltage too low (At least, mine wouldn't) so if that happens just reset the CMOS/BIOS and you are good to go.
 
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mercury529

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Aug 29, 2008
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Thanks for the reply. CPU-z shows 3.7 GHz when 2-4 cores are loaded and 3.9 GHz when a single core is loaded.

Thanks for the confirmation on the voltage.
 
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