Skylake Non-K Overclock on ES? - Overclock.net - An Overclocking Community

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Skylake Non-K Overclock on ES?

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post #1 of 1441 (permalink) Old 05-07-2016, 09:07 PM - Thread Starter
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Okay, so updating the first post...

Yes, overclocking your ES skylake is 100% possible. You can do it even without the non-k bios (at least, with the Asus z170-k I was using!).

Keep in mind, though, depending on the model you use (the QHQG is the one I'm using) has a low multiplier that would require a BLCK over 170 to reach stock i7-6700 speeds.

Most motherboards using the standard clockgen cannot handle this. Your board will have severe stability issues, and will crash a lot if you can get your board to start at all. More voltage to the core, or to the PLL can fix this to an extent but you WILL reach a wall where you'll get such huge diminishing gains it's impossible to get any farther. You'll need to get a Z170 motherboard with a dedicated clockgen.


So to recap.

OCing is possible. You don't lose AVX instructions, temps read out ok and I'm pretty sure the integrated GPU still operates fine. Turbo boost also works, as well as speedstep. So, basically every issue with normal non-k OCing you shouldn't have, which is obviously a huge bonus.




Now, I'm also going to say this was MY experience with this. I do not know if this will apply to all ES CPU's, or to all motherboards, so take these results with a grain of salt. If you can get it to work, you can get a really nice CPU for considerably cheaper than normal price.

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post #2 of 1441 (permalink) Old 05-08-2016, 12:28 PM - Thread Starter
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Anyone have an answer? tongue.gif

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post #3 of 1441 (permalink) Old 05-08-2016, 12:53 PM
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The 6400 is a quad-core?

four cores/four thread making it a I5 (as it is) and not a I7?

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post #4 of 1441 (permalink) Old 05-08-2016, 01:35 PM - Thread Starter
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It's an engineering sample so it doesn't have the actual name of the chip on it. The seller has it listed as an i5-6400T, (which is incorrect) but from the info CPU-Z has given its actually an i7 engineering sample. Shows 4 cores, yes, but it has 8 threads.

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post #5 of 1441 (permalink) Old 05-08-2016, 11:07 PM
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Ahh!

Awesome!

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post #6 of 1441 (permalink) Old 05-08-2016, 11:08 PM
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Quote:
Originally Posted by hiemal View Post

It's an engineering sample so it doesn't have the actual name of the chip on it. The seller has it listed as an i5-6400T, (which is incorrect) but from the info CPU-Z has given its actually an i7 engineering sample. Shows 4 cores, yes, but it has 8 threads.
Very strange about the ES edition, I can't provide any input on that. I have an i5 6400 which has a 2.7ghz clock default and up to 3.3ghz turbo. I have achieved stable BCLK overclock using an ASRock Z170 K4 of up to 4.8ghz easily. I am currently running at 4.4ghz for daily gaming/usage with a Vcore of 1.32.

I have heard many say that they have to compromise the amount of DDR4 frequency in order to achieve stability, as it is tied to BCLK. Most guides advise not to exceed 2600mhz due to instability. I have not found this to be true in my case, I can run 2x 8gb G.skill sticks at 3000mhz at 14-15-15-35 timings (still messing around with them). There is vast overclocking potential if you have the right board and BIOS for it in my opinion.

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post #7 of 1441 (permalink) Old 05-09-2016, 11:13 AM - Thread Starter
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I did more snooping around on this CPU and apparently it's dubbed a code i7-6400T. Obviously a weird part number but it fits with what it sounds like. Another person actually found this CPU too and was asking questions about it on Reddit so.

I'm also thinking this is a later revision since it has the Intel logo on the IHS and looks more refined than the ones i've seen on Google.

But again, who knows. All speculation. I ordered a motherboard and some RAM so we'll see how it performs in a few days!!

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post #8 of 1441 (permalink) Old 05-09-2016, 11:26 AM
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Some people run into issues with BLCK speeds above 160-175 or so. With a budget Asus Z170-E and i5 6400 I can run 170 BLCK for a few Pi runs, 165 for games but have to lower it to 162 to pass stress tests. 1.285v @ 4.37ghz is my 24/7

definitely a cool sounding chip though. CPU-Z screens when you get a chance or voteban biggrin.gif

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post #9 of 1441 (permalink) Old 05-10-2016, 10:54 AM - Thread Starter
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post #10 of 1441 (permalink) Old 05-10-2016, 12:15 PM
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Just for the record, Intel ES CPUs are owned by Intel. Buying one on EBay is the equivalent of buying stolen property.

This CPU sells for 750 Yuan in China which is equivalent to $115 US so someone is making a decent profit selling stolen property. Here is the CPU-Z screenshot from the EBay seller's post.



http://i.imgur.com/NaROb6z.png

This CPU has nothing to do with a Core i5-6400T. It is a Stepping 1 which means it is an initial ES processor. The retail Skylake CPUs are Stepping 3 so Intel likely fixed quite a few bugs between the initial ES and the retail version. All CPUs, including retail CPUs, have a long list of mostly minor bugs. For a gaming rig, you will probably not have any problems.

The good news is that this CPU is likely an early test version of the Core i7-6700, non-K. The multiplier is limited but other than that, it has more in common with this Core i7 compared to any other Intel Skylake CPU. It has the locked max multiplier, 8 MB of L3 cache, 4 Cores, 8 Threads and the all important 65 Watt TDP. The i5-6400T is a 35 W part without hyper threading so it is completely different.

http://www.silentpcreview.com/Intel_Core_i7-6700

When BCLK overclocking, you will lose the AVX instructions which kills performance in some benchmarks and in some professional software but for many games, AVX doesn't make much of a difference. Post some pics when you get yours up and running. On a good board, you might get a decent overclock out of it.

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