Overclocking i7 7700k

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Re: Overclocking i7 7700k

Post by Ztranier » Tue Oct 10, 2017 3:27 pm

good shout Chris from my Point of view.

why does a dog lick his balls? because he can.
(thats what i once have heard from a japanies engeneer developing the new Honda Jazz at the Honda research Center in Offenbach GER when a Journalist asked him why they put a 7gear autmatic box into such a small car)
Last edited by Ztranier on Tue Oct 10, 2017 5:06 pm, edited 1 time in total.

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Re: Overclocking i7 7700k

Post by Berkman » Tue Oct 10, 2017 4:40 pm

A lot of misunderstanding in this post of yours. First tip in overclocking, go fully manual. You won't be able to test anything while Intel SpeedStep is on. Turn it off, it should lock your vcore to 1.35v and 4.5 ghz. Now enjoy the burn for a while. Second part, you didn't mention any temperatures. Before even thinking about overclocking, you should know how hot your CPU gets with EIST on. Turning it off will certainly make it toastier.

How to test that? You torture it with Prime95. Check temps. For 30 minutes after EVERY SINGLE CHANGE. Ah, you also didn't mention what cools that CPU of yours. It is essential that you have adequate cooling.

That doesn't guarantee stable games. As they are usually console ports and are profiled depending on the ID your part reports, not clock speed. Some games might give you BSods, again, you have to check them to know for sure.

Now you have established a baseline for your CPU on stock clocks and voltages. Now fun begins.

You increase your clock ratio and run the stress test and check temps. If it holds, great, up it till it falls face flat (BSOD or any other crash) at which point, you up the voltage. Repeat as many times you are comfortable.

Nobodys voltages or clock ratios will help you. It is silicone lottery. Every chip is different, every system is different. Hell, application and brand of a freaking thermal paste can improve your temps by 5 to 7 degrees. There is a lot to consider. Chassis air flow, thermal transfer, how much heat your cooler can remove. Play around. Don't be afraid. As long as you won't push your voltages beyond 1.4v you should be fine, hopefully. Hundreds of people pushed it past that. As I've said, it's a gamble. Unlikely but one of those transistors might not like you and fail, know that that's on you.

Check temps -> check stability by torture testing -> up the clock ratio a tiny bit -> check temps -> check stability by torture testing

If computer crashes, up the voltage tiny bit -> check temps -> check stability by torture testing

Repeat. Voltage is basically a way to stabilize your cpu, not a means to speed it up.

This is only the beginning. After anything significant there are, RAM timings, PCI timings and a lot of other aspects to consider. Which you have to deal with case by case basis. Often times, alone, trying various settings. Methodical approach won't help because at this point, your envelope is in the lottery again.

Does it worth it? No. What will you gain the best case? 4 to 7 FPS. 2 to 4% performance gain BEST CASE.
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Re: Overclocking i7 7700k

Post by 0v3rz34l0u5 » Tue Oct 10, 2017 5:29 pm

The Intel k processors are designed to be overclocked so it shouldn’t really effect their life too much. That said, As long as you’re using the BIOS to do it and it’s optimised for your system (e.g. the ROG Mobos have a wizard to know what you’ll be doing and how you’ll be cooling it and over locks it accordingly).

Do you have water cooling?
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Re: Overclocking i7 7700k

Post by Chris_86 » Tue Oct 10, 2017 5:54 pm

Berkman / Zealous: temperatures were all in the screenshot attached to the original message as a URL (I cannot figure out for the life of me how to paste photos on this forum), and I'm cooling via a 280mm radiator (Corsair H115i). I will check re SpeedStep. All good feedback, I will try the incremental approach re voltage and base clock multiplier.
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Re: Overclocking i7 7700k

Post by Berkman » Tue Oct 10, 2017 6:18 pm

Perfect! You can push it pretty far with that cooler, however there is something wrong with the heat transfer those temps are too high, unless of course you are running the radiator with very low rpm fans. I'd check the thermal paste if you are running your fans auto before running any overclock. Or you'll quickly hit throttling temps.

Even my 9590 machine hasn't hit 70 whole summer! And that has a TDP of 250watts! Yours is only 91watts! You should be running it at around 40 to 50 degrees C max load.
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Re: Overclocking i7 7700k

Post by Chris_86 » Tue Oct 10, 2017 7:56 pm

Those temps were stress testing at 4.7 GHz to be fair which is a 0.25 GHz overclock. - Prime95 failed instantly however, so there's clearly some geeky work to be done here.

*rubs hands with glee*
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Re: Overclocking i7 7700k

Post by Berkman » Tue Oct 10, 2017 8:12 pm

Still, should be at most low 50s high 40s. 70 is just to much for a water cooler. My vote is on thermal paste. Would change it asap.
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Re: Overclocking i7 7700k

Post by Stujb » Tue Oct 10, 2017 10:13 pm

If Panda and Berkam get into discord together, I might have to create a new channel and put them in it...Not saying I wouldn't join it, just saying these guys might be too geek for most.

Love you guys :)
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Re: Overclocking i7 7700k

Post by Berkman » Wed Oct 11, 2017 7:30 am

You know you are always welcome <3
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Re: Overclocking i7 7700k

Post by Chris_86 » Wed Oct 11, 2017 11:39 am

Right Berkman, I've got to the root of the problem.

AVX instruction sets seem to absolutely cane the CPU especially under Prime95 which is about the worst thing you can do to a CPU apparently, so whatever I have the base clock multiplier set to, I need to ensure the AVX offset runs down to 4.5 GHz (currently stable on Prime95).

My plan is to get the non-AVX OC as high as poss (currently 4.7 GHz and stable under Prime95), and then reduce AVX offset if it's possible. Will try to keep voltages as low as possible and definately =<1.35 volts.

Obviously lost the silicon lottery with this one as I've seen some people get AVX Prime95 stable at 4.8 without delidding. Ho hum.
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