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i7 3820 - 4820 Overclock Club - Page 252

post #2511 of 6491
Yes. I never posted here before. It's not in my subs either. I've been getting them for a few weeks now
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Steampunk TJ11
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post #2512 of 6491
Is there a quick list of motherboards that work well with OCing the 3820? I've finally given up on my G1 Assassin.
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post #2513 of 6491
Quote:
Originally Posted by Michalius View Post

Is there a quick list of motherboards that work well with OCing the 3820? I've finally given up on my G1 Assassin.

Everyone seems to love the RIVE. Really solid board from what I've heard.
post #2514 of 6491
Thread Starter 
Quote:
Originally Posted by DeadlyDNA View Post

How long have you had your 3820? I know the Cpu Degradation rate is more subjective to what people throw around with and without experience. Was just wondering if your speaking more for your personal experience or citing a source?
Nice Overclocks by the way!
Personal experience , 5432mhz , 129 i7 3820 o/c snappers ,Ive had/got 4 3820s 2 malays 1 costa and a ES biggrin.gif I killed sad-smiley-002.gif my first malay that got me 5432.1Mhz , the ES is a dud sozo.gif Overvolting my crap is what I do laughingsmiley.gif

Quote:
Originally Posted by Michalius View Post

Is there a quick list of motherboards that work well with OCing the 3820? I've finally given up on my G1 Assassin.
Asrock x79 Asus R4F , RIVE , msi x79 , intel x79 smile.gif
R4F does it for me and costs less more left over to get custom w/cooling wink.gif
Edited by HOMECINEMA-PC - 2/11/13 at 3:03am
post #2515 of 6491
Quote:
Originally Posted by DeadlyDNA View Post

How long have you had your 3820? I know the Cpu Degradation rate is more subjective to what people throw around with and without experience. Was just wondering if your speaking more for your personal experience or citing a source?

Nice Overclocks by the way!

CPU degradation is subjective because it depends on numerous factors which are specific to the chip, ie quality of the silicon, spatial distribution of defects, quality of the solder job, etc.

Not to mention factors related to the cooling setup, ie poor contact or uneven application of thermal paste can exacerbate the problem.

This is kind of a simplification but essentially degradation is caused by electrical stress on the transistors, where they are exposed to higher current than they were designed to handle, this creates defects in the transistor which lower its current gain, thus requiring more base current than before to function at the same level it used to. The degradation process is dependent primarily on current intensity and duration of exposure but also indirectly related to temperature since electrical properties of other components in the system vary with temperature, making it easier for current to flow at high temps.

Source: I'm an EE, have degraded numerous chips in the past, wrote a 30-page research paper on a related topic in college. Googling 'Transistor stress degradation' will give you lots of scientific journal articles on this topic =)

Note: The thing about 'duration of exposure' is why its a very bad idea to run extended stress tests like hours and hours of prime 95 at high voltages. A stable overclock at high voltage under normal use conditions might cause very little degradation since the amount of time spent at high currents is usually limited; however, when you start stressing the processor at 100% for extended amounts of time at high voltage the amount of degradation will eventually start to grow exponentially
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dev rig
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Music Workstation
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i7 3820 (Swiftech Apogee HD block) ASUS Sabertooth X79 GTX 670 4GB SLI (XSPC Razor blocks) 64GB Patriot Viper 1866 
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Crucial M4 SSD Custom Water, 2x D5, 2x RX360  Cougar Vortex 120mm PWM Fans Antec Spot Cool (VRM/RAM cooling) 
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Win7 Host, Linux/OSX VM 3x ASUS PB278Q WQHD (PLP config) Das Keyboard v1 NZXT Hale90 1000W 
CaseMouseAudio
Danger Den Torture Rack Logitech Performance MX Logitech Z5500 
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2x Samsung 245BW Saitek Eclipse v1 Enermax 500W Antec Atlas 550 Server Midtower 
MouseAudioAudioAudio
Logitech M400 MAudio BX5a Studio Monitors Denon AH-D5000 Headphone TC Electronic Desktop Konnect 2x2 Interface 
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post #2516 of 6491
Thread Starter 
Its good to have you here mate I wouldn't been able to explain it like that thumb.gif . Im just a modest truck driver redface.gif . We have a couple of aerospace engineers floating around here as well good stuff I rekon smile.gif
post #2517 of 6491
Question...

Is DeltaT the difference between water temp and cpu idle temp or load temp?

Asking as my difference between water temp and my cpu idle temp is only 5-7c
Is that good?
Room ambient temp is only 3-5c lower than water temp.

Thanks

Edit.. Ok think i have it figured out.
Delta t is the difference between ambient temp and water temp.
In which case my delta t is about 6c, which from what i have read is pretty decent.
Edited by Wookieelover - 2/12/13 at 4:23am
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post #2518 of 6491
Delta is the difference between ambient and whatever the temperature is of the thing you are measuring.
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zfz.Professional
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post #2519 of 6491
in general, delta anything is final value-initial value. In this case your final would be the temps you're seeing after stress testing and initial would be your idle temps.
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post #2520 of 6491
Would i get lower temps from using offset voltage instead of set voltage?
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