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About C-States and VID !

post #1 of 8
Thread Starter 
I have some questions about C-States and about this so-called VID.

First, what is that VID ? Core Temp shows me the VID, is the same thing with the vcore ?

I have a 3770k 4.5Ghz 1.2V and if i stress the CPU, in Core Temp VID shows 1.246V

And i had a picture from the past with my CPU and while he was stressed, and i'm using the same BIOS overclock settings, and in that picture under stress test with prime95 the VID was 1.22V, and now is 1.24V, why is that ?

And about C-States, if i put C6 State from BIOS, it will affect my CPU performance and every day usage ?

Because C States brings the CPU when is in idle into a sleeping state, and if the CPU needs to stress he wakes from the C States. This will not affect the CPU ?
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post #2 of 8
VID is the amount of voltage the CPU is requesting. The amount of voltage your CPU actually gets is usually called vcore. If you go into the bios and select a fixed voltage for your CPU, the VID voltage will be ignored. If you use offset voltages in your bios, the vcore will approximately be the VID voltage the CPU is requesting, plus or minus the amount of voltage offset you have selected in the bios.

The C States will reduce your CPU power consumption while you are using your CPU. Intel designs their CPUs so they can very rapidly change between different C States. Your CPU will be in the C0 state when it is working on a task and when it has nothing to do, it will drop down to the C1 state. The longer it has nothing to do, the deeper low power C State it will drop down to. Individual cores will drop down to C3 or C6 if these are enabled in the bios and once all of the cores reach the same C State, the entire CPU package can drop down to that same C State to save even more power. As soon as full performance is needed, the CPU will go back into the C0 state. It takes approximately 200 microseconds to go from C6 back to C0 so you can save power and reduce your CPU core temperature without ever noticing any performance loss.

Intel designed their CPUs to use these C States. It will not hurt anything if you use this feature. You can also overclock your CPU and you can continue to use the C States to save power.

You can use RealTemp to monitor the amount of time your CPU spends in various low power C States to understand them better.

RealTemp T|I Edition
http://www.overclock.net/t/1330144/realtemp-t-i-edition
Edited by unclewebb - 5/22/13 at 5:59am
post #3 of 8
Thread Starter 
Why prime95 after 8K test, the program starts to crash ?
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Intel® Core™ i7 3770K @4.5Ghz (Multiplier OC) 1... MSI Z77A-GD65 [10.10 BIOS] MSi GTX 980 GAMING + MX4 @1544mhz/1.262v; +450M... Geil Black Dragon 4x4Gb 1866Mhz [XMP] 
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post #4 of 8

That means your overclock is not stable, and you need to increase your Vcore.

post #5 of 8
Thread Starter 
Increased it to 1.22V in the BIOS, and in stress test drops to 1.2V, and now prime95 passed his 8K test, and further continued, but i stopped it, cuz it's stable.

Curious that intel burn test, can pass with lower voltage, and in games i can put lower voltage and don't have a problem with stability.
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CPUMotherboardGraphicsRAM
Intel® Core™ i7 3770K @4.5Ghz (Multiplier OC) 1... MSI Z77A-GD65 [10.10 BIOS] MSi GTX 980 GAMING + MX4 @1544mhz/1.262v; +450M... Geil Black Dragon 4x4Gb 1866Mhz [XMP] 
Hard DriveCoolingOSMonitor
Samsung 850 EVO 500Gb [AHCI] Noctua NH-D14 Windows 10 Home 64-Bit 10586.420 (FPP/retail key) BenQ XL2411T [Dual-Link DVI, 144Hz] AUO M24HW01... 
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Razer BlackWidow Ultimate 2014 [green switches] Enermax Revolution 87+ 750W and APC Back-UPS 950VA Phanteks Evolv Atx Tempered Glass Black + ATX 2... Razer Mamba 2015 Tournament Edition 
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post #6 of 8

Different programs and applications put different types and amount of stress on the CPU, so it's not unusual to be stable in some things at a given voltage, but not in others.

post #7 of 8
Thread Starter 
I understand, you think 1.22V in BIOS and 1.20V in stress test is a good voltage for my 3770k 4.5Ghz ? ( i also use PLL to 1.6)

And the temps in stress test are 67 to 78 degrees, most colders core and most hottest core, generally they stay in 74 degrees, only some spikes to 78 for some seconds.
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CPUMotherboardGraphicsRAM
Intel® Core™ i7 3770K @4.5Ghz (Multiplier OC) 1... MSI Z77A-GD65 [10.10 BIOS] MSi GTX 980 GAMING + MX4 @1544mhz/1.262v; +450M... Geil Black Dragon 4x4Gb 1866Mhz [XMP] 
Hard DriveCoolingOSMonitor
Samsung 850 EVO 500Gb [AHCI] Noctua NH-D14 Windows 10 Home 64-Bit 10586.420 (FPP/retail key) BenQ XL2411T [Dual-Link DVI, 144Hz] AUO M24HW01... 
KeyboardPowerCaseMouse
Razer BlackWidow Ultimate 2014 [green switches] Enermax Revolution 87+ 750W and APC Back-UPS 950VA Phanteks Evolv Atx Tempered Glass Black + ATX 2... Razer Mamba 2015 Tournament Edition 
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SteelSeries QcK Mini Asus Xonar DGX 
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PC
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel® Core™ i7 3770K @4.5Ghz (Multiplier OC) 1... MSI Z77A-GD65 [10.10 BIOS] MSi GTX 980 GAMING + MX4 @1544mhz/1.262v; +450M... Geil Black Dragon 4x4Gb 1866Mhz [XMP] 
Hard DriveCoolingOSMonitor
Samsung 850 EVO 500Gb [AHCI] Noctua NH-D14 Windows 10 Home 64-Bit 10586.420 (FPP/retail key) BenQ XL2411T [Dual-Link DVI, 144Hz] AUO M24HW01... 
KeyboardPowerCaseMouse
Razer BlackWidow Ultimate 2014 [green switches] Enermax Revolution 87+ 750W and APC Back-UPS 950VA Phanteks Evolv Atx Tempered Glass Black + ATX 2... Razer Mamba 2015 Tournament Edition 
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SteelSeries QcK Mini Asus Xonar DGX 
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post #8 of 8

Yes, 1.22V is good for 4.5, and those temps are okay also.  Sounds like a good overclock.

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