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My New i7 920 System: Over clocked to 4.4GHz Stable!

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dhruvdas2000
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2010/05/09 16:53:41 (permalink)
Hello Everyone,
This is my first gaming system and I am proud to say I think I have done a good job!..Here are my components:
 
1) MoBo  - EVGA X58 3xSLI Classified
2) CPU  - Intel i7 920 D0
3) Primary Graphics card - XFX Radeon HD 5970 BLACK EDITION
4) Dedicated Physx - BFG GTX275
5)Case - Corsair Obsidian 800D
6) PSU - Enermax Galaxy EVO 1250W
7) RAM - Corsair Dominator GT 2000MHz
8)OS HDD - 2x300GB Corsair Velociraptor 10000 RPM in RAID0
9) Data HDD - 1 TB Corsair Caviar Black
10)LG Blue Ray Writer
11)MSI Dual Layer DVD Writer
12)Vantec 58-in-1 card reader
13)NZXT Sentry II Fan Controller
 
WaterCooling:
1)TFC Xchanger Quad Radiator
2)4 x TFC Xtender Radiator Shrouds
3)8 x CoolerMaster 2000 RPM Blue LED Radiator Fans
4) Feser One UV RED ½ inch ID Tubing
5)Laing D5-VARIO Swiftech MCP-655 Pump
6)Swiftech Micro Resv Ver2
7)Swiftech Apogee XT CPU Water block
8)BitsPower ½ inch ID Barb connectors
 
Right now I am stable with my i7 920 overclocked to 4.4 GHz. I have used following settings:
BaseClock:210, CPU Multi:21, Vcore:1.3925v, CPU VTT: 1.35v, VDIMM:1.64v, CPU PLL: 1.86v, IOH/ICH core:1.2v, Memory timing:7-8-7-20 74, Vdroop:off with all Intel specs:disabled except for Turbo.
I am getting temp. of 39-40-39-38 idle and 61-62-60-61 on 100% load. I have run Prime-95 for over 24 hours with no error and I have got 3Dmark Vantage score of 30001. I have played Battlefield Bad Company 2 for multiple hours with no issues. Seems to be pretty stable system so far. I need to play with the voltages little bit more to see if I can get down with the voltages a bit.
Even if I am new to overclocking I know what I am doing, so that’s why probably I am able to get 4.4 Ghz stable.  Here are few simple things that need to be remembered to get a very stable overclocking:
Core i7 920 Defaults- 2.66GHz, 20x133MHz, 4.8GT/s QPI (2.4GHz), QPI multiplier 18x (18x133MHz)
First, changing the BCLK speed affects everything from core speed, to QPI link speed, to Uncore speed, to memory speed. The key elements are the QPI link speed, Uncore speed, and memory speed. Mainly, the QPI is the limiting factor for the other elements as the highest stable QPI link speed for the current Core i7 processors is 8.0GT/s or 4.0GHz. The important relationships between QPI, Uncore, and DRAM speeds need to be considered at all times. DRAM speed must be in a 1:2 ratio or less to Uncore speed which in turn must be in 1:1 or less ratio to QPI link speed (8:9 Uncore to QPI or lower is preferred as the more you approach 1:1 the more unstable the system becomes). The reason Uncore to QPI ratio is 8:9 because highest supported memory for Core i7 is 1066MHz with a QPI of 4.8GT/s or 2.4GHz. According to processor specifications, Uncore would then be running at 2xDRAM (or 2x DRAM multiplier, in this case 16x) which results in an Uncore speed of 2132MHz. When you take the ratio of Uncore to QPI you will get 2132:2400 or approximately 8:9.
Another thing is that, it’s impossible to run 2000 MHz DRAM speed with i7 core processors. Using the simple ratio we defined earlier, we can see that with the maximum QPI link speed of 4.0GHz we can have a theoretical maximum Uncore of 4.0GHz and a maximum memory speed of 2.0GHz. These however are only theoretical maximums and are not guaranteed. For beginners, QPI and Uncore cannot run at the same speed as any clock oscillations can result in a crash. Consequently, if we cannot achieve 4.0GHz Uncore, this means that we absolutely cannot achieve 2.0GHz memory and we can therefore not guarantee any stability for 2.0GHz memory. Technically, the maximum DRAM speed for a stable system is equal to ((Max. Uncore) / (Safe QPI:Uncore Ratio)) / 2 or (4.0GHz / 9:8) / 2 = 1.777GHz. In between 1.777GHz DRAM and 2.0GHz DRAM you are likely to experience some level of instability over the long term. Past 2.0GHz you are just plain lucky. With My system I am running, memory multiplier of 8(default), so my DRAM speed is 210x8 = 1680MHz which is less that 1777 MHz and that is why I am stable. My uncore speed is 3360 and QPI is 3780MHZ or 3.78GHz which is again less than 4.0GHz and that’s why stable!
I have followed every rule according to this link: Thanks to dejanh!
[link=http://www.xtremesystems.org/Forums/showthread.php?p=3496262]http://www.xtremesystems....owthread.php?p=3496262[/link]
I have spent a lot of time and money on this project, so please be constructive with your comments, any suggetions are always welcome!
Good luck with your overclocking!
 
 
post edited by dhruvdas2000 - 2010/05/09 19:36:39

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    dhruvdas2000
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 16:59:10 (permalink)
    Sorry for same pictures multiple times, while trying to upload picture it kept giving me error, but looks like it did upload every time..lol
    #2
    expedision
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 17:00:06 (permalink)
    Even if I am new to overclocking I know what I am doing, so that’s why probably I am able to get 4.4 Ghz stable.  Here are few simple things that need to be remembered to get a very stable overclocking:

    Please post in this thread and show us what you got
     
    http://forums.evga.com/tm.aspx?m=7747
    post edited by expedision - 2010/05/09 17:59:32

     
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    #3
    Sum1uNo83
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 17:45:11 (permalink)
    nice oc now stress test it and go further. a overclocker never stops

                                           
                                                               
    #4
    dhruvdas2000
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 17:56:58 (permalink)
    thanks jrmitchell1983...you are right, lets see how far i can go till I fry my chip..I do have a replacement warranty..lol
    #5
    KMoore4318
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 18:54:19 (permalink)
    dhruvdas2000

    Sorry for same pictures multiple times, while trying to upload picture it kept giving me error, but looks like it did upload every time..lol


    You do know you can use the Message options to Edit message

      
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    #6
    dhruvdas2000
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 19:37:22 (permalink)
    Thanks KMoore4318 ..i was able to remove the unnecessary images!
    #7
    pwnzorz
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 22:17:24 (permalink)
    good job, nice OC, i'm still working on passing 4.6ghz at the moment on my 920, but i'm pumping ungodly voltage into mine, 1.55+

    Evga E760 Classified
    920 D0 @ 4.4ghz
    6GB Mushkin Redline 2000mhz
    Radeon 5970 @ 950/1250
    Radeon 5870 @ 950/1250
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    #8
    DAVD305
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 22:30:54 (permalink)
    WOW can you post a Linx25k  20 pass screen shot at 4.4ghz, gotta see that. Your build looks sweet man.




    X58 3 WAY SLI/ H50/I7930/OCZ6G-1600/1TB WD-GREEN/EVGA 470 SC
    #9
    cstkl1
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    Re:My New i7 920 System: Over clocked to 4.4GHz Stable! 2010/05/09 22:34:59 (permalink)
    TS thats a lot of rubbish assumptions up there on dejanh based on his limitation and hardware limitations at that time when he wrote that

    1.2000mhz is not that hard.limitations of hardware and knowledge is what hindering ppl. heck theres no limitation on how fast the dram can do as long u have good cooling and good understanding of sub timings of uncore.

    2. 8.0 G/T is not the max for i7 920. u can go more. again another big assumption

    3. 4.4ghz is pretty easy with dram 2100 uncore 4200 qpi 3780. the question is again back to ure understanding of subtimings.

    so please dont follow that rule. as it was totally baseless.



    post edited by cstkl1 - 2010/05/09 22:46:28

    Work rig/Game Rig
    i7 920@4.3ghz HT On/OFF x 2 - 1.29v,DFI UT X58/DFI DK X58,Corsair Dominator GT 2050 C7 3x2gb/Gskill Trident 2k C9 6x2gb,Kingston SSD M25 80gb x2/ M25 G2 80gb x 2/WD Veloci 150gb x 4/WD 1tb Black x 2,Asus 4890 x 2 Dual Fan 1000/4200mhz ,Coolit Freezone Elite+RV01+Promilatech Megahalem+FT01


    #10
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