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Haswell Overclocking Guide [With Statistics] - Page 1045

post #10441 of 19599
Quote:
Originally Posted by Wirerat View Post

Freezes are often cache/memory related. I suggest lowering the uncore/cache freq.

trust me when I say I've tried all that. im 100% confident its just a voltage threshold issue. past 1.26V vcore it starts to become unstable. 1.3V instead freeze smile.gif 1.4V no boot. Anyone have the same issue and any work arounds? Microde or any updates?
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post #10442 of 19599
Quote:
I followed Cyro999 advice and started back with 1.23 Vid at 1.85V Input and Cache at 33/1.15V wich managed 41 multi. From that i went at 42 that required 1.25 Vid (wich passed x264 x5 loops, IBT at Very High 10 runs, LinX (2GB ram) 20 runs and over 30 min of prime small fft’s that i stopped manually)
But 43 multi seems elusive... I raised the voltage in.05 increments up to 1.285 and it’s still unstable (gave me “x264.exe has stopped working” error twice) and prime small fft’s resets PC within seconds, without BSOD. I haven’t gone further because even at 1.29V seems to much, an increase of .04 for 100MHz from 42 to 43.

Ok few things to say here: +100mhz will only give you ~2-3% usually, it's the bigger jumps that can make a difference

+0.04 isn't actually a lot for 100mhz, from what you say i would increase VRIN some for targeting 43 (to ~1.9 atm) and just give it 1.29, 1.3 if you have to. No reason to run small fft or IBT or linx (IBT and linx are the same thing, why run both?)

If you want a test that's harder on vcore than x264, use prime95 27.9 custom test, use >90% of your available RAM, set fft lengh min and max to 1344 and then set it to high priority. It's a bit overkill.

Given that i can throw 1.4v on air if i want without using HT a hair over 1.3 should be ok for you, if you want it. It's unfortunate to get a chip that's 200mhz below average.
Quote:
I haven’t gone further because even at 1.29V seems to much, an increase of .04 for 100MHz from 42 to 43.

If we could get average increases of 0.03 per 100mhz.. Starting from 4ghz@1.05v, we'd hit 5ghz on an average chip at 1.35v. That's not the case at all, sometimes you have to throw twice as much as that, especially when you start to reach around the ~1.3vcore threshold

Quote:
Originally Posted by mojobear View Post

trust me when I say I've tried all that. im 100% confident its just a voltage threshold issue. past 1.26V vcore it starts to become unstable. 1.3V instead freeze smile.gif 1.4V no boot. Anyone have the same issue and any work arounds? Microde or any updates?

It's very possible (i say that because i didn't spend hours running repeated tests on this specifically..) that adding vcore especially without raising VRIN can cause instability for Haswell. As a baseline, use a high level of LLC (max or 1-2 levels down) and keep it ~0.6v over vcore
Edited by Cyro999 - 2/26/14 at 9:12am
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post #10443 of 19599
Quote:
Originally Posted by mojobear View Post

trust me when I say I've tried all that. im 100% confident its just a voltage threshold issue. past 1.26V vcore it starts to become unstable. 1.3V instead freeze smile.gif 1.4V no boot. Anyone have the same issue and any work arounds? Microde or any updates?
i want to fully understand your issue. If you are at say 4.0ghz and set vcore to 1.4v it wont even boot?

What is your temps? What cooler are you using?
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post #10444 of 19599
Quote:
Originally Posted by coelacanth View Post

Fixed.

1.415 VID for 4.4 is pretty high. And 1.420v cache is well into the danger zone.
Its 4.5 with HT. Im running 1.47 VRING for a long time on my other 4770k rig since release and no issues. Heat kill before voltage.
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post #10445 of 19599
I've been doing some more tweaking and I've got some data on my 4770k:

HT off, running on custom loop, and not delidded.
Memory @ 2133, 1.5 v
Uncore @ x 42, 1.2 v (vRing)

4.5 GHz @ VID = 1.28 v, vCore = 1.292 v, vRin = 1.78 v
4.6 GHz @ VID = 1.31 v, vCore = 1.328 v, vRin = 1.81 v
4.7 GHz @ VID = 1.375 v, vCore = 1.397 v, vRin = 1.875 v

Each VID was found to be lowest possible for CPU to run at listed speed (with all other settings fixed and vRin scaled by VID + 0.5 v) under six hours of Lynx 0.6.4 (AVX, but not AVX2).

With a 55 C ambient temperature, maximum core temp was 94 C @ 4.7 GHz with VID = 1.375 v; chip did not throttle during testing.
post #10446 of 19599
Quote:
Originally Posted by xSDMx View Post

I've been doing some more tweaking and I've got some data on my 4770k:

HT off, running on custom loop, and not delidded.
Memory @ 2133, 1.5 v
Uncore @ x 42, 1.2 v (vRing)

4.5 GHz @ VID = 1.28 v, vCore = 1.292 v, vRin = 1.78 v
4.6 GHz @ VID = 1.31 v, vCore = 1.328 v, vRin = 1.81 v
4.7 GHz @ VID = 1.375 v, vCore = 1.397 v, vRin = 1.875 v

Each VID was found to be lowest possible for CPU to run at listed speed (with all other settings fixed and vRin scaled by VID + 0.5 v) under six hours of Lynx 0.6.4 (AVX, but not AVX2).

With a 55 C ambient temperature, maximum core temp was 94 C @ 4.7 GHz with VID = 1.375 v; chip did not throttle during testing.

Nice. Our CPUs seem similar. I'm going to try you 4.6GHz setting and maybe even 4.7. As you mentioned our 4.5 settings are identical.
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post #10447 of 19599
my 3rd 4770k Batch # L310B507 4.6Ghz @ 1.375v ..................they keep getting worse sad-smiley-002.gif
Edited by lilchronic - 2/26/14 at 11:10am
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post #10448 of 19599
Quote:
Originally Posted by lilchronic View Post

my 3rd 4770k Batch # L310B507 4.6Ghz @ 1.35v ..................they keep getting worse sad-smiley-002.gif

Need to find one of the L310B48x chips, there were a few good ones in those batches. I missed the boat too & got a L310B569, pretty average chip.
    
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post #10449 of 19599
Quote:
Originally Posted by lilchronic View Post

my 3rd 4770k Batch # L310B507 4.6Ghz @ 1.375v ..................they keep getting worse sad-smiley-002.gif

Is that just to boot?
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post #10450 of 19599
no, i ran XTU for a hour and played BF4 so far........... just got the chip today wink.gif

still need to delid it and maybe get 4,7 ghz redface.gif
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