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Overclocking Non-K CPUs

post #1 of 6
Thread Starter 
This is (I think) a very important topic, and yet it so often is glossed over; people will say things like "You can't overclock a non-k CPU", "Not unless you have the right motherboard", and even "You idiot, everyone knows you can't". However, none of these statements is precisely correct. The way that one overclocks a non-k CPU is simple - by adjusting the BCLK! However, most motherboards do not have a BIOS option for this. This doesn't mean that you can't overclock beyond the Turbo Boost maximum clock, however, as there have been multiple programs released to do so. If you have an MSI motherboard, then you can use MSI command center to alter voltages and raise the BCLK. If not, Intel itself released a tweaking program a while back called "Intel Extreme Tuning Utility", which is still available, and can actually be used to overclock "locked" cpus. Without lowering certain settings, I could only achieve a miserable 13 MHz overclock. But once I adjusted just a few things, I could raise the BCLK to 105, and thus run my i7 4790 at 4.2 GHz.

Guide to raising BCLK:
First, lower the memory multiplier and possibly clock multiplier. There are normally options for this in the BIOS, but if not, it may also be tweaked via the Intel XTU. I would advise raising the BCLK by 1 or 2 MHz at a time, just to be safe. (s def Speed, m def Multiplier, b def BCLK, c def Clock Multiplier) s = (m*c)*b, normally s = (m*c)*100. Assuming that δb = 1%, δ(m*c) = -1%, if my memory multiplier is 20, and my clock multiplier is 1 1/3, then my initial memory speed is 2666 2/3 MHz. If I were to increase BCLK to 101 MHz, the memory speed would now be 2693 1/3 MHz. Lowering it to 2666 1/3 would require either lowering my clock multiplier to ~ 1.32, or lowering my memory multiplier to ~19.8.
Second, you need to either disable or fix the frequency of the iGPU, as its clock speed increases with BCLK overclocking.
Thirdly (Optional, but highly recommended) lower the QPI to prevent system slowdowns.
Fourth, we need to take care of the problem of the IMC. It has its own clock speed, independent of the CPU; because of this we need to increase the VTT voltage. However, we must ensure that the VTT voltage is never more than 0.5 V below the memory voltage. By default it is calculated automatically by the motherboard, but because we are (presumably) raising BCLK on a motherboard that doesn't support it, it should be manually set by the user.
Finally, it will be possible to raise the BCLK. Overclock until your system crashes no matter what you do, then back down by about ~0.2-1 MHz. This should be stable.
This is a WIP, so if anyone has a suggestion as to how to improve this guide, please post below.
Edited by OP OC - 7/28/16 at 11:52am
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post #2 of 6
I have an i7-3820s which has the multiplier unlocked to 43 but no higher. The chips will run at 4.3GHz with no other adjustments. I run mine with the 125 MHz BCLK strap to get 4.75 GHz but just to prove your point I was asking an intel employee with support some other question about voltages and they denied that it was possible to overclock a non K chip. People are ignorant. BCLK can't always get you a ton if your board doesn't have a STRAP function but it IS totally possible to overclock to some extent.
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post #3 of 6
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That it is, and this is why I posted it. Officially, my board (MSI Z97 Gaming 5) doesn't support BCLK overclocking; but I am at 4.2 GHz as I said.
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post #4 of 6
What do you think I could do with an i5-4690 processor and an ASRock Fatal1ty H97 Performance motherboard? The thing is, you can overclock an i5-4690k with this ASRock H97 motherboard which is called ''Non-Z OC'', so you can OC it just like a Z97 motherboard. However what's it like for a non-K CPU? Still possible for what It's worth?
post #5 of 6
Thread Starter 
Quote:
Originally Posted by RivaLCF View Post

What do you think I could do with an i5-4690 processor and an ASRock Fatal1ty H97 Performance motherboard? The thing is, you can overclock an i5-4690k with this ASRock H97 motherboard which is called ''Non-Z OC'', so you can OC it just like a Z97 motherboard. However what's it like for a non-K CPU? Still possible for what It's worth?
You might be able to squeeze out a few MHz, but there will be practically zero performance gain if you do so, even in benchmarks and rendering.
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post #6 of 6
Thanks for the information, unlucky for me. I should've just spend the extra money on the i5-4690k, stupid decision by myself. At the time I didn't know the H97 Performance could OC though, hence why.
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