Skylake owners thread

[DrMrLordX]

I did a little fine adjustment to get 4.78GHz but it wasn't stable. Some have been able to boot without issue at 200MHz or higher, for some reason if I set mine at 110% or above it won't boot at all.

Currently running at 4.6, I'm going to try some small adjustments to the bclk in the near future.

Hmm, interesting. I wonder if it's board-specific at this point. Have you tried bclk adjustment from lower multipliers, or just high multis like 46x?

 

[Edrick]

OK, 4.7GHz (1.36 vcore) + DDR4-3000 failed Intel Burn Test pretty quickly (BSOD).

I've bumped vcore up to 1.38v and backed my DDR4 speed down to 2800MHz. Will report back on this...

Have you adjusted your VCCIO and VCCSA volts?

I have found that I needed to up mine from stock in order to be stable at 3000mhz RAM. Stock volts worked great up until 2800mhz for me.

VCCSA: stock: 1.060v, stable: 1.100v
VCCIO: stock: 0.960v, stable: 1.050v

I have read that both these values can go as high as 1.150v for 24/7 OC, so I am happily below that value.

 

[Deders]

Hmm, interesting. I wonder if it's board-specific at this point. Have you tried bclk adjustment from lower multipliers, or just high multis like 46x?

I remember having issues with my PCI soundcard on my last 1156 board where the sound would screw up when I raised the BCLK. I sent a message to MSI asking if they could decouple the PCI clock from the BCLK and sure enough the next bios revision they released did exactly that and I'd been running it without issue ever since.

I'm wondering if a similar thing is happening here. The board that could easily do 200/225 was an Asus z170 A which doesn't have the onboard Bluetooth or Wifi connected to the PCIe bus.

Asus's documentation says that (despite what Intel says) BCLK does affect PCIe but maybe not 1:1 so I need to work out whether these devices are connected directly to the CPU or Mobo PCIe.

I'm going to try and disable them and see if it makes a difference.

 

[DrMrLordX]

Intriguing. Please keep up posted, and thanks for the updates!

(on a somewhat-related note, I have the same problems on FM2+ wrt PCI-e stability. My PCIe SATA controller craps out at bclk speeds higher than 119 mhz, so obviously, on that platform, PCIe is tied to bclk).

 

[Burpo]

http://www.asus.com/Motherboards/MAXIMUS-VIII-RANGER/

Scroll down to the Asus PRO Clock section where it shows 400 bclk @ 5.2Ghz. with Z170 Deluxe & GSkill 3400 ram.

"A dedicated base-clock (BCLK) generator designed for 6th-generation Intel® processors that allows overclocked base clock frequencies up to 400MHz*. This custom solution works in tandem with the ASUS Turbo Processor Unit (TPU), to enhance voltage and base-clock overclocking control — granting an exciting new way to boost performance to extreme heights.

Advantages of PRO Clock
Less boot up time
Lower jitter under extreme conditions.
More stable under heavy overclocking.

* PRO Clock range up to 650 MHz is available, BCLK overclocking range may vary according to CPU capabilities"

 

[DrMrLordX]

Time will tell if we see similar features on less-expensive motherboards. The cheapest price I found for that board in one minute or less was $243 after shipping (NewEgg).

I think most users - particularly those looking to OC cheap(ish) locked parts via bclk - would be perfectly content with bclk speeds of 200 mhz tops. The default is still 100 mhz bclk no?

 

[Ajay]

FWIW, temps get so high with IBT (particularly with newer CPUs & AVX). I use OCCT and have been able to find very stable overclocks for years. I think the point is stable, not bullet proof - YMMV.

 

[steve wilson]

Just bit the bullet and bought it... will let you know how I do once I get it built.

 

[boondocks]

Currently testing 4.7 on my 6700K, running loops of x264 and already ran a few hours of Real Bench & some XTU benches.
Running Adaptive/1.380 in BIOS, highest peak vcore is 1.408 in x264 but stays mostly around 1.376.
I've kicked the Prime 95 habit finally. But for those of you that love it be sure and use v28.7. :biggrin:

 

[DrMrLordX]

Is there something new in 28.7 for Skylake users?

 

[LTC8K6]

28.7 must be a secret version...

 

[Deders]

There is a 28.7 version and apparently it fixes a bug that creates errors where they shouldn't with AVX2 and FMA3.

"Important:The bug that caused the N-1 primality test of 1024*3^1877301+1 to fail in PFGW and LLR was a serious bug. It is triggered by a lengthy carry propagation. I cannot prove that Mersenne LL tests are immune to this bug, although I've rerun dozens of Mersenne prime LL tests and every one passed. The bug affects AVX and FMA computers (more details in a later post). The bug has been present since version 27.1. To be safe, I recommend all users with Sandy Bridge or later CPUs upgrade to this version."
​

http://www.mersenneforum.org/showthread.php?t=20156

 

[crashtech]

http://forums.anandtech.com/showpost.php?p=37697089&postcount=48

My "24/7" is 4.6GHz with about 1.32V

 

[Deders]

http://forums.anandtech.com/showpost.php?p=37697089&postcount=48

My "24/7" is 4.6GHz with about 1.32V

That looks pretty good voltage wise, I wonder how much extra voltage is needed for HT.

 

[crashtech]

That looks pretty good voltage wise, I wonder how much extra voltage is needed for HT.

I think that the voltage setting shown in that Cinebench screenie might have been a bit flaky in LinX, like it would error out once, but then pass when I tried it again. It seemed rock solid otherwise in everything else I tried. LinX was the only sticking point. So technically I should probably have turned the voltage up a little more, but I didn't buy coverage for it so I didn't feel like messing around with a lot of voltage

 

[Deders]

This is a link to the Asus overclocking guide and the voltages they recommend.

https://drive.google.com/file/d/0Bz2VRRbLPrZnMXBnOXRWeVlHcHM/view

There's a more in depth guide for ROG owners, not sure how this translates down to other brands as Asus does have a very customised digital power delivery system and Bios options might not do the same thing with other brands.

https://drive.google.com/file/d/0Bz2VRRbLPrZnTFBIeUlCYW5MZXc/view

 

[DrMrLordX]

Whoa. Good find there. Big thing I noticed right off the bat:

Improved BCLK range. Intel’s default design allows for up to 170 BCLK. Our motherboards

utilize a custom solution which extends BCLK range to 400 MHz. In some situations, having

the additional headroom allows one to use a variety of combinations to maximize clock

frequencies.

Holy cripes on toast. 170 mhz bclk???? By default? That is aweeeeesommmmmeeeee.

All the Skylake products will probably top out at around 4.6-4.8 GHz with air/water, but still, a 4.8 GHz i3 would be so good.

 

[rtsurfer]

Might want to watch the V Core a lot.

I read somewhere the SL is a bit touchy there on possibly frying, but I don't have one I guess.

that's a lot of vcore to be putting into 14nm.. I've got 32nm and I leave mine at 1.32 volts @ 4.5 GHZ just because I want it to last a decade.

Considering some CPUs have a stock Vcore of 1.3V+, you gentlemen are worried about nothing.



Btw, people here should look into deliding, its not hard to get close to 20C drop if you use a good paste. :biggrin:

 

[crashtech]

Considering some CPUs have a stock Vcore of 1.3V+, you gentlemen are worried about nothing.



Btw, people here should look into deliding, its not hard to get close to 20C drop if you use a good paste.

Oh, which 14nm CPUs have that stock voltage?

 

[Deders]

i5 and i7 k series skylakes do.

Check out the max operating voltage on Intel's documentation. Page 115.

http://www.intel.com/content/www/us...top-6th-gen-core-family-datasheet-vol-1.html#

 

[crashtech]

I don't want to seem disagreeable, but, stock Vcore =/= Max Operating Voltage!

 

[Deders]

Max operating voltage is stated at 1.52v, way above stock.

 

[crashtech]

Max operating voltage is stated at 1.52v, way above stock.

You are absolutely right, but that has nothing to do with the point I was trying to make:

Considering some CPUs have a stock Vcore of 1.3V+, you gentlemen are worried about nothing.

Oh, which 14nm CPUs have that stock voltage?

Answer: None that I know of!

 

[rtsurfer]

Oh, which 14nm CPUs have that stock voltage?

Did you even read the Anandtech review...?

Another point to mention is stock voltage. On the samples we tested at least, the stock voltage of the processor under load seemed astronomical, varying from 1.320 volts to 1.416 volts. Having a ~0.100 volt variation between silicon is not fun for stock use, even with the retail sample being at 1.360 volts. That being said, all the processors happily combined an overclock to 4.3 GHz with a nice underclock to 1.200 volts, which might be the best thing to do when owning the chip.

http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation/6

 

[crashtech]

Did you even read the Anandtech review...?

http://www.anandtech.com/show/9483/intel-skylake-review-6700k-6600k-ddr4-ddr3-ipc-6th-generation/6

Looks like I am wrong. But my ASRock wasn't pumping anywhere near that into a 6600K at stock. I wonder if the MSI boards are unusual in this regard.

EDIT:

I need to find another review that reports such high stock voltages for Skylake, all of these report 1.2V or lower:

http://arstechnica.com/gadgets/2015/08/intel-skylake-core-i7-6700k-reviewed/

http://www.digitaltrends.com/computing/overclocking-intel-core-i7-6700k/

http://www.legitreviews.com/intel-core-i7-6700k-skylake-processor-review_169935/16

Many reviews don't seem to include what the stock load voltage was.

EDIT2:

This review reports a stock voltage that is "too high" at 1.392V!

http://overclocking.guide/skylake-overclocking-power-consumption-and-voltage-scaling/

So, I'm still wrong. How many users will feel OK with their CPU over 1.4V all the time, though?