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Overclocking i5-3470 to 4Ghz

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post #1 of 20 (permalink) Old 11-02-2012, 04:40 AM - Thread Starter
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Hey everybody,

I've just ordered a brand new i5-3470 and MSI Z77A-G43 motherboard to go with it.

The question is how do I overclock it? Do I turn off turbo and just set the multiplier to 40? If so, will the frequency automatically drop to 3.8Ghz with 4 cores active? Or maybe I should set the multiplier to 38 and leave the turbo on? What's the best way to go about it?

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M
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post #2 of 20 (permalink) Old 11-02-2012, 04:49 AM
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https://www.overclock.net/t/1281920/successful-overclock-to-4-0ghz-with-i5-3550-now-with-a-guide-to-oc-it

That thread will probably be useful.
Your cpu isn't a K version so you can't change the multiplier.

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post #3 of 20 (permalink) Old 11-02-2012, 04:55 AM - Thread Starter
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Is that so?

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post #4 of 20 (permalink) Old 11-02-2012, 05:12 AM
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You can raise the turbo multiplier by 4 bins thus giving you a 400mhz overclock on all non K ivy bridge processors. Other than that, you're stuck with 4ghz unless you raise the BCLK a couple notches (100-107) but you raise the risk of instability if you up the BCLK too much as it overclocks other parts in your system as well.

So yes, leave turbo on and up your multiplier by 4, but it looks like you already did thumb.gif

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post #5 of 20 (permalink) Old 11-02-2012, 05:22 AM - Thread Starter
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Naah, I took the screenshot from anandtech review of that CPU. But if I up the multiplier by 4 wouldn't the CPU-Z say the Core Speed is 3,6Ghz? (the standard multiplier for that CPU is 32). Perhaps turning off turbo boost will allow me to get full 4Ghz with 40 multiplier, but the question is will it downclock to 3,8Ghz with 4 active cores? Will it even be stable?
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post #6 of 20 (permalink) Old 11-02-2012, 05:42 AM
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It will show 3.6ghz but it will turbo to 4ghz when you load an application, all four cores will only turbo to 3.8 and 4ghz for single/dual core. If for some reason you can still get that 40 multiplier with turbo off then go for it, as it will allow all 4 cores to run at 4ghz simultaneously.

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post #7 of 20 (permalink) Old 11-02-2012, 06:01 AM
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I'm able to get 3.8 GHz on all 4 cores, and turbo boost will allow 3.9 on 2 or 3 cores, and 4.0 when a single core is loaded. The 38x multi will run indefinitely. I left all the EIST and TBT settings enabled, so it downclocks to 1.6 when not loaded. There's no need to disable cores in the BIOS.

With a bclk of 105.3, you can have 4GHz on all four cores.

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post #8 of 20 (permalink) Old 11-02-2012, 06:23 AM - Thread Starter
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So the x40 multi anandtech suggested is not in fact a stable multiplier for this CPU? frown.gif

Is the 105 bclk absolutely safe and stable?

The parts will probably arrive on monday, I'll update.
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post #9 of 20 (permalink) Old 11-02-2012, 06:30 AM
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Quote:
Originally Posted by humanoidal View Post

So the x40 multi anandtech suggested is not in fact a stable multiplier for this CPU? frown.gif
It's stable in the sense that the computer won't crash, but mine overrides the 40x multi with a 38x once all cores are loaded. It's part of turbo boost, 40x is only allowed on a single core.

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post #10 of 20 (permalink) Old 11-02-2012, 06:51 AM - Thread Starter
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What do you mean overrides x40? Isn't 3,8 max freq for all cores loaded? Or do you mean with 105 bclk?
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