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I can't stabilize my i5 6600K @ 4.5GHz

post #1 of 7
Thread Starter 
Hi I have the i5 6600k, MSI Z170 GAMING M5 and G.skill RipjawsV Red DDR4 2400 16GB 2X8. The cooler is a CoolerMaster Seidon 120V. The OS is W10 Pro x64.
I tried to overclock it to 4,5GHz with adaptive voltage+0.25V offset. The low load voltage at 4.5Ghz is 1.416V, Prime95 runs at 1.376V, and LinX 0.65 runs at 1.368V. NThe max temperature is 80ºC.

Prime95 v27.9 blend test 8K crashes within 1 hour at random times. Sometimes it lasts 3 minutes, sometimes it manages to get past 45minutes until it gives a rounding error.
Small FFT are stable at least for 1 hour.

Linx stops at 25 seconds.

Passed Memtest86 with no errors.

My BIOS setup is:
  • Core multiplier 45x
  • Ring 37x (changing this makes no difference in stability)
  • BCLK 100
  • XMP disabled
  • RAM Frequency 18x100x1.33=2400mhz (tried lowering this to 2133 but remains unstable)
    Memory try it! Disabled
  • Core voltage: Adaptive+offset 0.25V
  • EIST enabled
  • Enhanced turbo disabled
  • C-states disabled
  • All other voltages (SA, IO, DRAM, PLL,...): auto
  • CPU voltage compensation disabled (enabling it does not have effect on Vcore nor stabilty)
  • No LLC options available on this board

In games it runs fine without crashing and temps are under 60ºC.
If I try to raise the multiplier to 46X it gives MACHINE CHECK EXCEPTION BSOD in LinX no matter the voltage I set.
I tried to raise SA and IO voltages to 1.25 and 1.2, but no stability yet.

I don't know what to do anymore. Maybe I'll switch to an Asus Maximus VIII Hero.
Edited by gtaadicto - 10/5/15 at 3:41am
post #2 of 7
Quote:
I tried to overclock it to 4,5GHz with adaptive voltage+0.25V offset. The low load voltage at 4.5Ghz is 1.416V, Prime95 runs at 1.376V, and LinX 0.65 runs at 1.368V

You're using the hardest loads possible to start out. If you want to use those loads, i would suggest either stabilizing 43x then 44x first, working up 100mhz at a time. Alternatively you could start working with an easier but still moderately difficult load to stabilize like x264.

No LLC really sucks for you.

Have you read this thread for info/discussion meanwhile? I don't think there's a magic solution for you though~ http://www.overclock.net/t/1570313/skylake-overclocking-guide-with-statistics/

It's worth noting that both prime small FFT and updated versions of linpack cause HUGE power draws. They will very likely make your vcore droop a LOT more than other loads, that could be part of your problem. Maybe you should bypass them entirely without LLC.

a137470f_power.png

^CPU pulling 85 watts more from the wall from switching load from x264 to Linpack. That's probably about 75 watts from the PSU.

Using adaptive voltage for initial stability testing will also complicate things a bit
Edited by Cyro999 - 10/5/15 at 3:51am
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post #3 of 7
Thread Starter 
Quote:
Originally Posted by Cyro999 View Post

You're using the hardest loads possible to start out. If you want to use those loads, i would suggest either stabilizing 43x then 44x first, working up 100mhz at a time. Alternatively you could start working with an easier but still moderately difficult load to stabilize like x264.

No LLC really sucks for you.

Have you read this thread for info/discussion meanwhile? I don't think there's a magic solution for you though~ http://www.overclock.net/t/1570313/skylake-overclocking-guide-with-statistics/

It's worth noting that both prime small FFT and updated versions of linpack cause HUGE power draws. They will very likely make your vcore droop a LOT more than other loads, that could be part of your problem. Maybe you should bypass them entirely without LLC.



^CPU pulling 85 watts more from the wall from switching load from x264 to Linpack. That's probably about 75 watts from the PSU.

Using adaptive voltage for initial stability testing will also complicate things a bit

I read the complete guide, and it seems people needs a lot lower voltage than me frown.gif

At 4.4 it is stable with 1.328V full load.

I ran the custom x264 stress test, 16T without problems for 10 runs at 4.5GHz (1h40min) 1.368V. I will leave the PC stresstesting overnight, I hope it does not fail.

At 4.6 it seems that the CPU needs a lot of voltage to not BSOD within minutes of x264 stresstesting. Lots of Vdroop. I would need LLC in order to make 4.6 overclock feasible.
post #4 of 7
I don't know why people are buying boards with those vdroop issues (aside from lack of proper coverage from review sites, i guess) and more importantly, i don't know why they exist in the first place. Asus nailed the LLC on the Hero and i thought i was going to regret spending for it or brand choice at the time - now it seems like a lot of people are scrambling to buy one. It just sucks all around
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post #5 of 7
Thread Starter 
Passed 62 loops of the x264 custom loop 16T normal priority without crashing for 10 hours.

6600k 4.5ghz 1.368V under load

I guess it is stable enough to play games/ render videos without crashing.
post #6 of 7
You -are- rendering video's with x264 biggrin.gif

If it does crash for any reason just add 0.015v. I do that after passing long term x264 for my 24/7's anyway but usually it's not strictly neccesary
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post #7 of 7
i got same CPU, mobo and ram as you do, my gpus are 2x r9 270x 2gb crossfire, psu rm850i, windows 8.1pro, and we're in the same boat. im running bios v1.7 which was a big improvement from 1.2, i think that intels micro code update did the trick and some features of the bios now works better.

from what i can see, the main problem is no LLC, i was actually really pissed when i realized that. neway, this is the cause of massive vdroop when running high wattage, which is why you could run aida64 for a week and not even be able to start prime95 27.9. you should run 26.6 small FFT, about 30-40tests should be plenty to see you're temps,gonna cap at maybe 85watt @ 1.312-20v (well get to this value later). instead of unrealistic 120-130watt on 27.9. neway, once this is done i usually set aida64 full test for a few hours, than i run alot of benchmarks, this way i can analyze if my oc is actually better. at 4.5ghz Skydiver physics tests gives me about 33fps on tier 4, 96treads, 8200pts stock, 10 000 @ 4.5ghz, about 8-10 frames over stock values on the hardest test. cinebench single core goes from 160 to a stunning 193pts (stock 4790k scores about 170pts) and all cores from 615 to 745pts, which i was very impressed with, 600mhz for an average of +20% all across the benches and games i tried.

i also have a bad core, #2, anything over 4.2 on prime95 makes this core fail at some point, rounding error, no bluescreen if voltage is okay. neway, im also using adaptive mode + offset(+), it seems that when in adaptive mode this mobo also changes integrated graphics and ring voltage, HWmonitor shows much higher temps when runing higher voltage on VID while the Vcore stays the same. so i ran a few tests at stock speed, VID on stock caps at 1.240v. thats a value you can only replicate underload at 1.200-1.215vcore, from there every extra volt as to be set from offset+ so if you want 1.350v add 0.150v to offset voltage, also make sure voltage compensation is enable or auto, its most likely the worst look alike for LLC but well take it lol. neway these are my settings and been gaming 8h/day without a single sign of instability. one thing i havent played with is ring frequency, im thinking that its possible you will need to raise vcore (so that the ring voltage raises too) if you want to boost the ring but i really cant tel. neway, my setups are;

Bios. v1.7
multiplier 45x
ring 39x(auto)
dynamic
turbo on
eist on
enhance turbo enable
XMP on (thats actually how you bring the ram to the indicated frequencies.)
c-state enable, c1 disable (you can turn it on if you want, i dont)
Adaptive + offset(+)
Vcore 1.200v
offset 0.150v
OI and Agent should be auto if your running 2400mhz, i think you have to bump them a bit if you got 2666+ just dont go over 1.2 and be careful the board adds 0.050v to agent and 0.010v to IO, im personally stable at 1.050v agent, 0.950v IO (Auto)
ram should be from 1.200 to 1.350, set manual value of what yours requires if needed, some say it works better, i didnt really noticed but on auto the voltage does drop to 1.192 and doesnt when set manually

HW monitor should show something like this
Vcore min 0.912v to 1.352-60v max

VID 0.765v min - 1.240v max
IA 1.249 (fix value)
GT offset +0.000
LLC/Ring 1.249(fix value)
system agent offset +0.000

frequencies should go from 800 to 4500mhz, my voltages reads 1.360 max, 1.344-52 while aida64 1.336-1.344 is as low at it got under load during game sessions,and cinebenchr15. prime95 26.6 can bring it down to 1.312v and this is where it might crash, i say might cause i dont run prime more than 20minutes i just wanna see temps, and it usually clears it. you can always add some voltage to your offset but from what ive seen, it can even crash at 1.4v (1.350 underload in prime) and i dont feel its worth going over 1.4v unless you can get a stable 4.7 - 4.8ghz out of it, they say its safe as long as you're not over 1.45, so its up to you. i dont feel like its worth it for 4.5ghz, if i ever encounter issues ill go back to 4.4 and thats about all i think i could do at this point, neway as of now ive never seen instability at those voltage for gaming, but thats all i do so keep that in mind.

i count about 350hours of theses games combined without any issue what so ever since i set this overclock on 1.7bios ;
bf4 max settings, arma 3 max settings, starcraf 2 max settings, diablo 3 max settings, path of exile max settings, iracing max settings, assetto corsa max settings, dirt rally max settings, heroes and general max settings, CS GO max settings.

i havent been able to set a reliable 4.6ghz at any voltage, went as high as 1.430 and it failed aida64 after 20mins, cinebench cleared but with lower results than 4.5, and prime failed 1 time on lunch(core 2), 2 times about 2mins in, bsod + couldnt finish gathering info, had to manualy reboot. i had enought xD

if anyone actualy read this,you most likely already bought your mobo and realised you couldnt just do what everyone says on youtube ''just punch in 47x and 1.4v itll all go well'' but ya, neway, the easiest solution for you if this is what you want at all cost, with Skylake it seems to be quite simple, get an Asus board.

Cheers!thumb.gif
Edited by vince14 - 2/26/16 at 5:03am
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