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Haswell Overclocking Guide [With Statistics] - Page 906

post #9051 of 19539
Quote:
Originally Posted by Akehage View Post

Thanks Darkwizzie for the thoughts about adaptive mode. I will try to have manual instead. But I cant really figure it out exactly what all c-states should be set in.
I have made a printscreen of my BIOS, but cannot open it. Its a BMP file.

Found another one on internet: What settings should I use on all theese?

I have an Asus board (Maximus VI Extreme). This would be my understanding of the CPU Power management Settings you show above (of course I reserve the right to be wrong smile.gif ):
  • Enhanced Intel Speedstep Technology (EIST): This will enabled the CPU's ability to lower the CPU clock (multiplier) when it's under "less load". I believe it will go down as much as 8x multiplier. This feature is to save power when only lightly using the CPU. Most OC guides I see tend to say to disable this because other C states will just as effectively save you power and there is some worry that dynamically moving the multiplier might affect stability and performance.
  • Turbo Mode: This will allow the CPU run at the highest multiplier under heavy load. Ironically, when disabled it's my understand the CPU will always just stay at the highest multiplier (turbo setting). Most guides say to leave it enabled. Frankly I don't quite get it either way. As far as I can tell, it's stays at the multiplier you set (assuming EIST is disabled). But this might be a Asus "multi-core enhanced" thing.
  • CPU C states: "Auto" means you get what Asus likes to have as the settings for all the items below it (I believe in that case it's just Enhanced C1 is enabled). "Disable" will turn off all Core C states (power saving techniques). "Enable" let's you choose the particular settings below.
  • Enhanced C1 state: When a core is idle (i.e. not doing any work / is in halt state at that micro-second of time), enabling this will allow the core clocks to be turned off (0x multiplier). Voltage is still applied to the core saving all it's state / cache contents, but since the clock is off very little power is used. Coming out of a C1 state is relatively fast.
  • CPU C3 report: This is similar to C1 above, but in addition to turning off the clocks, it will also set the voltage to a large portion of the core to 0 (includes caches). This saves even more power. Since voltage is shut off to the caches (small storage inside the core to hold a portion of memory to save time) they will be flushed (contents written back out / lost). Coming out of a C3 state is slower due to voltage shutoff. (Likely not noticeable to desktop user).
  • CPU C6 report: This does all the same as C3 except even more voltage is shut off on the core (likely the full core now). This last bit of voltage removed is involved in holding other state and in order to turn that off, that state must be saved out to the uncore (ring / LLC) cache. The time to come out of C6 is slower than C3 as it now involves reading back that state from the uncore cache.
  • C6 Latency: I haven't seen much on this one, but I would guess it selects the amount of core state to save to the cache versus just "lose". More saved likely means less impact to performance when coming out of the C6 state.
  • CPU C7 report: In theory this is C6 with even more voltage turned off / state saved to cache. Although I might have heard in my travels that effectively there isn't much a difference on the haswell chip from C6.
  • C7 Latency: The would be similar to the C6 setting ... how much to save.
  • Package C State Support: This chooses what happens when all the cores (4 in Haswell) reach the same C state on the entire CPU package. The particular C state chosen by this (C2/3/6/7) likely has similar meaning as they do for core ... trading off when to turn off to save power versus what it might take to come back out of it again. The part of the CPU affected by this is likely the uncore side power savings.

I personally run with: EIST off, Turbo on, C1 on, C3 on, C6 on, C7 on, Package C7s. The thought here is for a desktop, that added time to come out of the higher C states is not noticeable. In fact usign a program like "RealTemp" which can show C states dynamically, you would see most of the time when web surfing / etc, you're 90%+ in the lowest C state. I also believe there is some logic in the Haswell chip that will choose how high of a C state to use at a given moment based on activity levels / trends. So it's doing it's best to keep the impact minimum.

In terms of adaptive voltage versus manual with C states .... I believe the difference is adaptive voltage combined with EIST (changes multiplier on activity level) will lower Vcore as the frequency goes down. This isn't C states (although they too can be on here), rather just the Core "going into a lower gear" when lightly loaded and not in halt state. For manual voltage, you stay at the voltage setting you put regardless of EIST, etc. However, if C states are also on (which are typically recommended for Haswell) then when in halt state (idle if you like), voltage will go to 0v as per the C state chosen. I think monitoring programs that show Vcore dynamically is showing voltage averages over a period of time (albeit a very short period of time). So if a core using manual voltage is coming in and out of a C state that shuts off the voltage, the average will approach 0v shown as it spends a higher amount of time in C3 or more. At least that is my theory based on what I read in various places.

BTW if you like to read more about C states, I found a good paper here. It's a bit dated (i.e. not written for Haswell) but the C state meanings tend to stay the same from generation to another. Just usually add higher ones and/or make the current ones work better / more complete / faster.
http://impact.asu.edu/cse591sp11/Nahelempm.pdf
Magnus Nummus
(35 items)
 
 
CPUMotherboardGraphicsGraphics
I7 4770K Asus Maximus VI Extreme GTX Titan GTX Titan 
GraphicsRAMHard DriveHard Drive
GTX Titan GSKill Trident 4x8G Samsung 840 pro Intel 520 
Hard DriveHard DriveOptical DriveCooling
Western Digital Green Western Digitial Green LG Bluray read/writer 9x Corsair Air Series SP120 Fans 
CoolingCoolingCoolingCooling
PrimoChill 1/2in Rigid Acrylic Tubing + Ghost c... Aquacomputer Flow Rate Sensor "High Flow USB"  16x Phobya Nano-G Fans XSPC RayStorm  
CoolingCoolingCoolingCooling
Alphacool NexXxoS XT45 Full Copper 480mm  Alphacool NexXxoS ST30 Full Copper 480mm  Alphacool NexXxoS ST30 Full Copper 240mm  AquaComputer Aqualis XT 
CoolingCoolingCoolingOS
Bitspower BP-2D5TOPP-BK Dual D5 Mod Top  Aquacomputer D5 Pump Mechnics with USB and Aqua... Aquacomputer D5 Pump Mechnics with USB and Aqua... Windows 8.1 
MonitorMonitorMonitorKeyboard
Samsung 27B970  Samsung 27B970  Samsung 27B970  Max Keyboard Nighthawk X8 Custom Backlit Mechan... 
PowerCaseMouseAudio
Corsair ATX1200i Corsaid 900D Rokcat Kone XTD AudioEngine 5+ speakers 
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Magnus Nummus
(35 items)
 
 
CPUMotherboardGraphicsGraphics
I7 4770K Asus Maximus VI Extreme GTX Titan GTX Titan 
GraphicsRAMHard DriveHard Drive
GTX Titan GSKill Trident 4x8G Samsung 840 pro Intel 520 
Hard DriveHard DriveOptical DriveCooling
Western Digital Green Western Digitial Green LG Bluray read/writer 9x Corsair Air Series SP120 Fans 
CoolingCoolingCoolingCooling
PrimoChill 1/2in Rigid Acrylic Tubing + Ghost c... Aquacomputer Flow Rate Sensor "High Flow USB"  16x Phobya Nano-G Fans XSPC RayStorm  
CoolingCoolingCoolingCooling
Alphacool NexXxoS XT45 Full Copper 480mm  Alphacool NexXxoS ST30 Full Copper 480mm  Alphacool NexXxoS ST30 Full Copper 240mm  AquaComputer Aqualis XT 
CoolingCoolingCoolingOS
Bitspower BP-2D5TOPP-BK Dual D5 Mod Top  Aquacomputer D5 Pump Mechnics with USB and Aqua... Aquacomputer D5 Pump Mechnics with USB and Aqua... Windows 8.1 
MonitorMonitorMonitorKeyboard
Samsung 27B970  Samsung 27B970  Samsung 27B970  Max Keyboard Nighthawk X8 Custom Backlit Mechan... 
PowerCaseMouseAudio
Corsair ATX1200i Corsaid 900D Rokcat Kone XTD AudioEngine 5+ speakers 
OtherOtherOther
Aquacomputer XT Aquacomputer LT Aquacomputer Multiswitch 
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post #9052 of 19539
Lol sorry, when I say crash Im talking about BSOD when doing prime tests.
I have followed the guide also, so I really think my cpu sucks big time : /

Oh and Peakclimber, I have seen you have posted something BIG. Will check and many thanks!
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post #9053 of 19539
You don't even mention bsod code....
post #9054 of 19539
No, I was not able to catch that bsod message. Its the Win 8 messages. So PC restarts it self automatically
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SSD, Intel 180GB Phantek PH-TC14PE Windows 8.1 Dell S2740L 
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post #9055 of 19539
Bluescreenviewer will become your overclocking buddy, then.
post #9056 of 19539
Got it, and the previous bluscreen is there, dont know what info you want from the program?
Bug check code: 0x00000124
caused by driver. hal.dll

Parameter 1 - 4
00000000`00000000
ffffe000`02854028
00000000`bf800000
00000000`00000124

crash adress: ntoskrnl.exe+14dca0
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post #9057 of 19539
Bsod x124 is almost always more vcore
post #9058 of 19539
Quote:
Originally Posted by jameyscott View Post

Bsod x124 is almost always more vcore
Yeah, and that states that my cpu sucks then : )
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post #9059 of 19539
Quote:
Originally Posted by Akehage View Post

Yeah, and that states that my cpu sucks then : )

Not exactly, it just states that you don't have the correct level of voltage set for the OC you're trying to use....biggrin.gif
post #9060 of 19539
Quote:
Originally Posted by Akehage View Post

Yeah, and that states that my cpu sucks then : )

Akehage, you can also try increasing the Core Input Voltage to around 2.0 and lowering your VCore. I've come up with a few stable settings at 4.7 on my chip with varying voltages between VCCIN (Input Voltage) and VCore.

As for your CStates. Leave all of them enabled and set the Package support to C7s. It's simply a set of instructions that are hardwired into the haswell processors for the L3 cache memory clearing which allows for faster power state cycling. At least, that's what I understood from the research I gathered on it.
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