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i7 3930K - How to overclock it?

post #1 of 31
Thread Starter 
Hey Overclock Community,

I think this forum should be the right one for this kind of question. I did buy the i7 3930K some weeks ago because someone told me they're not that hard to overclock because of the multiplier, so I thought "Sounds good, I'm sure there are a lot of overclock guides in the Internet", which was a completely wrong thought, I didn't found ANY. So, I've never overclocked anything and I'm scared to destroy that damn expensive CPU now by one small wrong but fatal turn.

So I'd like to ask one of the more experienced users here in the forum now for some help, I need a good guide on how to overclock the i7 3930K to maybe 3.8 or 4.0Ghz, or just something which doesn't have that much of a risk to destroy it. I think I'll post my system specs again, maybe they're needed:

[ Windows 7 Ultimate 64bit ]
CPU: i7 3930K @ normal clock 3.20 Ghz
Graphics Card: PowerColor Radeon HD 7970 normal clock
Mainboard: Asus Rampage IV Formula
HDD/SSD: Crucial M4 SSD 128GB 2.5" SATA 6Gb/s // 1500GB Western Digital Caviar Green
RAM: 16GB Corsair Vengeance Red DDR3-1866
PSU: Inter-Tech 600W Coba Nitrox IT-7600SG [Unknown, but a good German brand]

I'd be glad about any answer,

thanks,
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post #2 of 31
http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers

I think that should do it smile.gif don't thank me; thank the writer!
 
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Murc
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post #3 of 31
With regards to your worry of destroying the chip, just keep the voltages in a reasonable range and you will be fine, to be extra safe may be stay around 1.3-1.35V?
post #4 of 31
What kind CPU heastsink are you using?

I advise you still to look at the official Sandy Bridge-E OC Guide as this a quick and dirty way to get stable


You can easily get away with 4.3-4.5 GHz with an average Air Cooler without risking damage to your chip.


But if you only want 4.0Ghz just go to BIOS change your multi to 40 and change the CPU vcore to about 1.185. and set you SA agent to 1.1

After that run Intel Burn test on the very high setting. let it run 10 times if it doesn't crash you're stable, if it does crash then raise your CPU vcore in increments of .005 until you reach stability.

Alternatively if you're stable from the first test you can start decreasing your vcore until its not stable and then revert back to the last stable voltage.

The point is to have the lowest voltage possible running at any frequency to ensure longevity, better temps and better efficiency.


And btw if you want to venture in the 4.3 to 4.5 Ghz territory start at a vcore of 1.295 and follow steps above to get lowest possible stable voltage.

Btw make sure you're monitoring your CPU temprature with a program like RealTempGT 3.7 or HWmonitor. If you ever go above 71C in any given core its time drop your OC in 100mhz increments
Good luck thumb.gif
Edited by shiftwig113 - 3/30/12 at 4:54pm
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post #5 of 31
Thread Starter 
Quote:
Originally Posted by shiftwig113 View Post

What kind CPU heastsink are you using?
You can easily get away with 4.3-4.5 GHz with an average Air Cooler without risking damage to your chip.
But if you only want 4.0Ghz just go to BIOS change your multi to 40 and change the CPU vcore to about 1.185.
After that run Intel Burn test on the very high setting. let it run 10 times if it doesn't crash you're stable, if it does crash then raise your CPU vcore in increments of .005 until you reach stability.
Alternatively if you're stable from the first test you can start decreasing your vcore until its not stable and then revert back to the last stable voltage.
The point is to have the lowest voltage possible running at any frequency to ensure longevity, better temps and better efficiency.

Oh, I completely forgot to add the heatsink to the specs, its the Alpenföhn K2 ( This should be the english description: http://www.alpenfoehn.de/index.php?option=com_content&view=article&id=175%3Aalpenfoehn-k2&catid=53&Itemid=44&lang=en ).

Already thanks to everyone
    
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post #6 of 31
with that you can easily get away with 4.4 GHz and if you're temps are in the low 60's you can even try 4.5GHz or 4.6Ghz
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post #7 of 31
I always put a small set of steps on how I overclock any CPU on any of my motherboard reviews: http://anandtech.com/tag/mb

Basically with your board, as it's an ASUS ROG, plays similar to any of my X79 ASUS reviews. This is what I put about the ASUS P9X79 Pro:
Quote:
Overclocking on X79

The realm of overclocking has changed in recent months, especially in the hands of Intel. If we take the previous enthusiast platform, X58 and LGA 1366, a full array of BCLK and multiplier adjustments were available. Personally, I moved from that platform (and my trusty i7-920 D0) to P67 and Sandy Bridge, where due to the clock generator arrangement, I had access to the multiplier and perhaps +/- 2-5 MHz on the BCLK. In terms of the joy of overclocking, this was a bit of a let down – but Intel has (sort of) met in the middle with X79.

On a basic level, we have a standard clock generator pumping out 100 MHz. This is split several ways, most notably one way to the CPU and memory through a buffer chip, and one way to everything else. Using this buffer chip, we can select four gears/ratios: 1.00x, 1.25x, 1.66x and 2.50x. As a result, we can send 100 MHz, 125 MHz, 166 MHz and 250 MHz to the CPU/memory, while restricting everything else to 100 MHz. The basic 100 MHz, like P67/Z68, can be adjusted – usually by +/- 2-5 MHz as Sandy Bridge was able. On top of all this, we also have multiplier adjustment.

With this in mind, I can already tell you that the majority of overclocks from system builders will be on the 1.25x ratio. It provides a simple 25% overclock if the multipliers are not changed, and providing they are using Intel’s all-in-one liquid cooling as a minimum (or a high end air cooler), temperatures should not be an issue. No doubt we will see motherboards that implement this as a one-button option on the motherboard – ASUS’ auto overclock option does something similar. In order to push the memory, users may opt for the 1.25x ratio, and then decrease the multiplier to a reasonable temperature level.

In terms of the ASUS’ board performance, I first had a go at the auto OC options.

Auto OC

ASUS offers a ‘Fast’ and an ‘Extreme’ mode in their software options. ‘OC Tuner’ in the BIOS, and activating the TPU switch on board, both default to the Fast mode. In this fast mode, we see a jump to the 1.25x CPU ratio, and a slight increase in the BCLK with a multiplier adjustment. Instantly, this equates to a 34x multiplier with a 126.4 MHz BCLK, giving 4296 MHz, which hits 68ºC in Cinebench (20ºC ambient max).

In Extreme mode, ASUS uses a series of algorithms and stress tests to determine the maximum frequency. Usually, I am underwhelmed by this option in my previous reviews, providing no real insight into the depth of the CPU. Despite this, the Extreme mode did run tests, BSOD and eventually reach a final speed without any intervention. A simple 35x multiplier and 127.9 MHz BCLK (4476 MHz) is good enhancement over the Fast auto OC option. However, it may worry some people that the CPU registered an 88ºC temperature when stress tested.

Manual OC

In terms of manual adjustment, my main focus here was the multiplier. Booting at 45x, with auto voltages and the CPU fan/pump set at 100%, the board was stable. However, it was pulling 1.496 V at load, resulting in 90ºC under full OCCT stress – far too hot for my liking, and this is outside a case! But setting the voltage manually to 1.4 V, the board still booted happily at 45x, giving only 82ºC under stress. The board would boot at 46x, but was unstable at 47x.

At the 46x multiplier, at 1.4 V, with load line calibration at auto, the CPU would hit 82ºC under OCCT or Blender Stress, and only 73ºC for the 3DPM multithreaded (3DPM-MT) benchmark. At this speed (4.6 GHz, 6 cores, 12 threads), our 3DPM-MT gave a score of 1145.66, up from 914.76 at stock.

Memory

Of note with this BIOS (0709), is that when I populated the memory slots with 4x4GB DDR3, the board would default to the nearest JEDEC speed timings of the kit to 1600 MHz – in this case, my G.Skill kit has a JEDEC of 1676 MHz at 11-11-11, so the board defaulted to 1600 11-11-11. When I selected 1866 MHz memory, it shifted to 9-9-9, disregarding JEDEC vales.

The XMP profile was easy enough to enable with the XMP mode. For more performance, I pushed the board on to the 2400 MHz strap, which booted at auto values of 10-11-10 2T, and was completely stable. Moving towards the 2666 MHz strap caused failed boots. The nearest strap while on the 1.25x ratio was only at 2333 MHz, suggesting that 2400 MHz on the 1.00x strap is a safe memory overclock.

For a simple overclock, as someone previously said, stick the CPU voltage at 1.2 volts and the CPU multiplier at 40x to 42x. All else on auto and it should play well. The Auto Overclocking is pretty good on ASUS boards through their AI Suite software, so use that thumb.gif
Edited by borandi - 3/30/12 at 4:59pm
post #8 of 31
Thread Starter 
I've just used IntelBurnTest with normal clocks to check the temperature and the temperatures are around 55-73°C when using "Stress Level: High, Times to Run: 10 and 2048MB RAM" , isn't the temperature too high for a normal clock?

EDIT:
Quote:
The Auto Overclocking is pretty good on ASUS boards through their AI Suite software, so use that

The AI Suite doesn't seem to work on my board, I do get this error: "AI Suite does not support this model."

edit2: Ah, my own fault, shouldn't just download some AI Suite from some page, I'm downloading the working version for my board from the Asus page now.
Edited by Android574 - 3/30/12 at 5:46pm
    
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post #9 of 31
Quote:
Originally Posted by A14M3D View Post

With regards to your worry of destroying the chip, just keep the voltages in a reasonable range and you will be fine, to be extra safe may be stay around 1.3-1.35V?


You can go up to 1.5. Anything beyond you need LN2. Best clock for 3930k is 4.7-4.8Ghz and you can keep pushing it to 5Ghz on air if you're lucky with the voltages.

     
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post #10 of 31
Thread Starter 
Well, I don't really think that this is already everything I had to do, or? Here's a screen:


35353.jpg
    
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