i7 940 OC + Lap

Discussion in 'Die-hard Overclocking & Case Modifications' started by biggi_, Oct 13, 2014.

  1. biggi_

    biggi_ Guest

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    So I'm debating trying to hold off on upgrading and lap/OC my 940. Right now I have it set at 3.52 GHz simply by turning EVGA Easy OC on in the BIOS and my temps are in the mid 60's under Intel Burn Test. My main question...is lapping worth the time/risk and what do you think the most OC for the C0 stepping processor would be?
     
  2. Agent-A01

    Agent-A01 Ancient Guru

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    Not worth the time, you will see 3-5c drop in temps from lapping/ C0 chips dont OC well, lapping wont fix that. 3.8 is about average.
     
  3. Veteran

    Veteran Ancient Guru

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    I lapped my TRUE- Black on my 920 c0 back in 2008 and i didnt see no change of temps at all. Got it nice and shiny too using 2000 grade sandpaper. Waste of time in my experience, will only work if the bottom of the heatsink is serverely tapered.
     
  4. CrazY_Milojko

    CrazY_Milojko Ancient Guru

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    I agree with Agent-A01 & Veteran. Lapping of 920/940 C0 is worthless for OC if temps under max.stress test like Prime95 & Intel Burn Test are below 70 Celsius. Also most of 920/940 C0 are OC'ing to around 3.8GHz, some more some less and with right cooling and right voltage (try to find lowest stable voltage while running some stress-test, lower voltage = lower temps) temps are below 70 Celsius even with HT ON.

    Few advices:

    1). Forget about EVGA's Easy OC, manual OC is the only was to go to push that 940 C0 to the max. Take pen & paper and write down every important setting in BIOS related to multiplier, BCLK, QPI, Vcore, RAM clock... And then begin with experiments for few days. Also while testing: Prime95 or Intel Burn Test, CPU or HWiNFO64 Portable...

    2). As I said before try to manualy find lowest possible voltage for that 940 C0 to run stable when max.stressed.

    3). If HT is not important to you (games and apps you are using) turn it off, without it you can get another 100 to 200MHz more to final OC and lower temps for sure. But... I'm voting for HT ON, it's Core-i7 FFS! :D

    4). If you have one afternoon to waste it'll no hurt for that i7-940 C0 to lap it, maybe you can shave few more degrees down (check with glass how flat is heatsink). Take your time, one or two beers and begin with sandpaper 800 to 1000 and end with 2000, do it with patience, your arm is probably going to hurt at the end, pain in right arm is gonna revive memories when you were a young boy :) There is almost zero risk to damage CPU while lapping , you can find a lot tutorials on internet how to do lapping propperly.

    Nice tutorial for 920 OC... principles are same for 920, 930, 940, 950... just different multiplier:
    http://whirlpool.net.au/wiki/rmp_i7_920_overclocking

    ...and of coruse D0 need less voltage compared to C0.

    If you need any more help here we are...
     

  5. lmimmfn

    lmimmfn Ancient Guru

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    get a cheapo second had 6 core Xeon 5650 for ~$70 and overclock it to 4.2Ghz, lower temps, less power, win win
     
  6. biggi_

    biggi_ Guest

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    I had looked into this previously, I'm thinking my mobo can handle those chips. My main question is will I see a performance difference in that for gaming? I've heard the Xeon chips are crap for gaming (but I could be wrong). Also can someone else verify that a 6 core Xeon would run on this board?

    http://www.evga.com/articles/00438/

    One last question...how would the 5650 compare to say a 980x? I also checked eBay and I can get the 965 for around $100. Would that be worth the extra little bit?
     
    Last edited: Oct 13, 2014
  7. lmimmfn

    lmimmfn Ancient Guru

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    Clock for clock theres very little difference between the consumer i7 9XX chips and the Xeon X56YY series. I havnt had time to install my 5650 yet but i would expect its probably about 2-5% slower than my 920 at the same clock speeds( but the Xeon has larger caches, higher QPI speed ), and the Xeon on average hits 4.2Ghz easily without insane temps whereas my 920@3.8Ghz runs quite hot, hence why i went for the Xeon.

    Theres tonnes of info here:
    http://hardforum.com/showthread.php?t=1820772
    http://www.overclock.net/t/1461359/...eon-l5639-benchmarks-inside-longest-post-ever
    the latter one has a bit of BS though as its comparing synthetic tests rather than gaming.
    Dunno about your mobo, you'll have to do some research, i read that the first gen EVGA's need a resolder or something but not sure if that applies to your mobo.

    980x and x5650/5660 would be much the same tbh. However i7 965 is still on the 45nm process wheres at 980 and Xeons are on the 32nm process( so less power consumption, better OC's etc. ). If you could get a 980x for the same price as a x5650 i would go for the 980.
     
  8. CrazY_Milojko

    CrazY_Milojko Ancient Guru

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    I guess (with latest BIOS 83 dated to 9/2/2011) Xeon X5650 can run on EVGA X58 SLI, but I'm a bit worried because there is no info about compatibillity between two of them:

    http://www.game-debate.com/hardware/index.php?pid=2111&moboList=Xeon Processor X5650

    http://www.pc-specs.com/cpu/Intel/Xeon/Xeon_Processor_X5650_/2111/Compatible_Motherboards

    Maybe it's better to ask EVGA support about compatibillity.

    Who said Xeon CPU's are crap for gaming? No way you can find better deal for X58 gaming than Xeon X5650 (unless you can find X5660/X5670 for similar price): 65$ - 70$ on eBay , lower power consumption, less heat, easy 4GHz OC on lower Voltage, on some good X58 mobo with decent heatpipe-based or some All-in-One cloosed loop cooler almost all of them OC between 4GHz and 4.6GHz (some even more, on H2O of course). And it's 6-core CPU, some newer games can (will) benefit from more cores resulting in higher fps.

    Just look at those insanely prices for i7-980X, there is not a single reason for going to 980x unless you got it for free.
     
  9. BLEH!

    BLEH! Ancient Guru

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    I have a W3680 (980X), hits 4.4 HT on on a NH-D14.
     
  10. biggi_

    biggi_ Guest

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    Thanks for looking for me! I found this and it looks like it is:

    http://www.cpu-upgrade.com/mb-EVGA/X58_SLI.html

    And looking at the prices, it looks like the 5650 is going to be the best/cheapest option...I'm thinking I'll buy one, go ahead and lap it since it will be off the motherboard (and I already have sandpaper laying around) and pop it in. However, I see some from Malay and some from Costa Rica, both SLABV3. Does this matter for OC?
     
    Last edited: Oct 13, 2014

  11. Agent-A01

    Agent-A01 Ancient Guru

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    No doesn't matter for OC, its luck of the draw.
     
  12. biggi_

    biggi_ Guest

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    Alright, thanks guys so much for your help. I'm going to go ahead and order this tonight and it should be here by the end of the week...getting excited. What's the best thing to bench so I can get before and after results to share?
     
  13. Veteran

    Veteran Ancient Guru

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    I would spend the extra and go for the X5675.
     
  14. biggi_

    biggi_ Guest

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    I appreciate your advice, but that's a bit more than what I really want to spend at the moment. This thread started out to OC my 940 and lap it, and now I spent $65 more than I anticipated (although well worth it). Is there any huge advantage besides the higher clocks? Also I would be willing to go for the x5675 if someone has one they'd be willing to sell me at a good rate :D
     
    Last edited: Oct 14, 2014
  15. CrazY_Milojko

    CrazY_Milojko Ancient Guru

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    X5650 vs X5660 / X5670 / X5750 / X5680... higher multiplier and that (in most cases) means better chances for higher OC. Also Xeons higher than X5650/X5660 are a bit pricey. Also avoid ES models of these Xeons, possible problems with them on many X58 boards.

    Keep me informed on this thread about you OC progress when your X5650 arrives...
     

  16. biggi_

    biggi_ Guest

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    What do you mean ES models?
     
  17. Agent-A01

    Agent-A01 Ancient Guru

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    Engineer samples, ie pre release CPUs
     
  18. biggi_

    biggi_ Guest

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    How do you make sure it's not ES?
     
  19. Agent-A01

    Agent-A01 Ancient Guru

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    It will say ES on the heatspreader
     
  20. CrazY_Milojko

    CrazY_Milojko Ancient Guru

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    Also all Xeon 56xx ES CPU's have 4-digit S-Spec (before ES mark) visible on heatspreader.

    Normal Xeon 56xx CPU's have 5-digit S-Spec and of course no ES mark on heatspreader.

    From my personal experience with all kinds of ES CPU's from pre-1366 generation in most cases they are cherry picked, mostly with fully unlocked multiplier (up and down): heaven for OC. But with Xeon ES CPU's from 5xxx generation on X58 boards you can run into all kinds of problems. In three words: avoid ES Xeons X5xxx ...or at least ask if you can test it and if some weird problem occurs can you return it back.
     

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