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Overclocking Ivy Bridge: Core i7-3770K Is A Mixed Bag

Intel Core i7-3770K Review: A Small Step Up For Ivy Bridge
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It’s easy to assume that shifting down to 22 nm lithography makes the Ivy Bridge design a more receptive platform for overclocking. Although it packs more transistors into less space, increasing density, the fact that the highest-end parts sport 77 W TDPs suggest lower thermal output.

At the same time, the 22 nm node is brand new, and Intel proudly admits that it changed more of its design than it normally would heading into a die shrink. That could spell trouble.

So, while it’s unclear how much truth is behind early reports that Ivy Bridge-based processors aren’t overclocking well, our own experiences in the lab certainly indicate a lack of consistency. Between three editors currently working with Core i7-3770K CPUs, two are able to hit 4.7 GHz and one saw frequencies as high as 4.9 GHz on air and using BIOS-specified voltages between 1.3 and 1.35 V. Curiously, though they seem to run Prime95 and Linpack without protest for hours on end, certain applications in our benchmark suite (mainly, 3ds Max) take these chips down within seconds. Achieving stability required dropping to 4.5, 4.5, and 4.77 GHz on our three samples.

In comparison, my boxed Core i7-2700K loads to Windows at 4.8 GHz and runs solidly at 4.7 GHz at 1.35 V.

The main difference between overclocking these two architectures, aside from Ivy Bridge appearing comfortable at just slightly slower frequencies, is that Intel’s 22 nm-based chips also run significantly warmer (somewhere around 10°C higher at each CPU’s maximum stable overclock). Thus, overclockers using big air will likely have the most difficult time nailing settings that are suitably aggressive, but still modest enough to promote longevity.


Ivy Bridge
Sandy Bridge-E
Sandy Bridge
Core Ratio Multipliers
Up to 63x
Up to 57x
Up to 59 x
Real-Time Core Ratio Changes
Yes
All Cores Simultaneously
No
Integrated Graphics Ratio Multipliers
Up to 60x
N/A
Up to 57x
Real-Time Graphics Ratio Changes
Yes
N/A
No
DDR Ratio/Frequency
Up to DDR3-2667
Up to DDR3-2400
Up to DDR3-2133
DDR Granularity
200/266 MT/s
266 MT/s
266 MT/s
XMP Reference Code
v.1.3
v.1.2 or 1.3
v.1.2
BCLK Overclocking
Limited
1.0/1.25/1.67x Straps
Limited


The phase/dry ice/LN2 crowd is in a different position. Enthusiasts able to keep Ivy Bridge cold have already exceeded 6.9 GHz with four cores active, partly because Intel increased Sandy Bridge’s 59x maximum core ratio to 63x. Because Z77 suffers the same limited BCLK headroom as Z68 and P67, most reports put 107 or 108 MHz as the practical limit. But boards able to hit 110 or 111 MHz couple well with higher multipliers and extreme cooling.

What can you expect from a Core i7-3770K at 4.5 GHz compared to a Core i7-2700K at 4.7 GHz? Nearly exactly the same performance, it turns out. Though I’m not entirely certain you’d want to leave the -3770K running with one core at 88 degrees for very long, it is stable.

In 3ds Max, which is very well threaded, overclocked Ivy Bridge finishes our workload just two seconds faster, narrowing a five-second gap at stock clock rates. iTunes puts the two chips just one second apart. At 3.5 GHz, they’re separated by three seconds.

Consider this a cursory look at overclocked performance in single- and multi-threaded tests. Our German team is working on a more in-depth overclocking analysis that should go live sometime this week.

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Top Comments
  • 32 Hide
    verbalizer , April 23, 2012 4:37 PM
    OK after reading most of the review and definitely studying the charts;
    I have a few things on my mind.

    1.) AMD - C'mon and get it together, you need to do better...
    2.) imagine if Intel made an i7-2660K or something like the i5-2550K they have now.
    3.) SB-E is not for gaming (too highly priced...) compared to i7 or i5 Sandy Bridge
    4.) Ivy Bridge runs hot.......
    5.) IB average 3.7% faster than i7 SB and only 16% over i5 SB = not worth it
    6.) AMD - C'mon and get it together, you need to do better...

    (moderator edit..)
  • 30 Hide
    Maziar , April 23, 2012 4:08 PM
    Great review as always Chris! looks like I'm staying with my 2500k for a while!
  • 23 Hide
    sublime2k , April 23, 2012 4:47 PM
    Now I'm happy for buying 2500K instead of waiting for IB. :) 
Other Comments
  • 18 Hide
    tecmo34 , April 23, 2012 4:07 PM
    Nice Review Chris...

    Looking forward to the further information coming out this week on Ivy Bridge, as I was initially planning on buying Ivy Bridge, but now I might turn to Sandy Bridge-E
  • 30 Hide
    Maziar , April 23, 2012 4:08 PM
    Great review as always Chris! looks like I'm staying with my 2500k for a while!
  • 7 Hide
    jaquith , April 23, 2012 4:11 PM
    Great and long waited review - Thanks Chris!

    Temps as expected are high on the IB, but better than early ES which is very good.

    Those with their SB or SB-E (K/X) should be feeling good about now ;) 
  • 5 Hide
    xtremexx , April 23, 2012 4:11 PM
    saw this just pop up on google, posted 1 min ago, anyway im probably going to update i have a core i3 2100 so this is pretty good.
  • 7 Hide
    ojas , April 23, 2012 4:15 PM
    it's heeearrree!!!!! lol i though intel wan't launching it, been scouring the web for an hour for some mention.

    Now, time to read the review. :D 
  • -3 Hide
    zanny , April 23, 2012 4:18 PM
    It gets higher temps at lower frequencies? What the hell did Intel break?

    I really wish they would introduce a gaming platform between their stupidly overpriced x79esque server platform and the integrated graphics chips they are pushing mainstream. 50% more transistors should be 30% or so more performance or a much smaller chip, but gamers get nothing out of Ivy Bridge.
  • 5 Hide
    JAYDEEJOHN , April 23, 2012 4:23 PM
    It makes sense Intel is making this its quickest ramp ever, as they see ARM on the horizon in today's changing market.
    They're using their process to get to places they'll need to get to in the future
  • 32 Hide
    verbalizer , April 23, 2012 4:37 PM
    OK after reading most of the review and definitely studying the charts;
    I have a few things on my mind.

    1.) AMD - C'mon and get it together, you need to do better...
    2.) imagine if Intel made an i7-2660K or something like the i5-2550K they have now.
    3.) SB-E is not for gaming (too highly priced...) compared to i7 or i5 Sandy Bridge
    4.) Ivy Bridge runs hot.......
    5.) IB average 3.7% faster than i7 SB and only 16% over i5 SB = not worth it
    6.) AMD - C'mon and get it together, you need to do better...

    (moderator edit..)
  • 5 Hide
    Pezcore27 , April 23, 2012 4:45 PM
    Good review.

    To me it shows 2 main things. 1) that Ivy didn't improve on Sandy Bridge as much as Intel was hoping it would, and 2) just how far behind AMD actually is...
  • 1 Hide
    pacioli , April 23, 2012 4:45 PM
    I don't know what to say... I'm not feeling jittery about upgrading and blowing $ on a new system... That is good I guess.
    I would have liked to see a bigger jump in performance. I'm still very satisfied with the i5 2500K system I built last year... This may actually be bad for Intel as they simply didn't innovate as much as I thought they would...
  • 23 Hide
    sublime2k , April 23, 2012 4:47 PM
    Now I'm happy for buying 2500K instead of waiting for IB. :) 
  • 4 Hide
    MKBL , April 23, 2012 4:55 PM
    It has been rumored that Ivy Bridge will be more expensive than comparable Sandy Bridge because of limited launch supply for a while. Is that right that Intel really will set Ivy's price low?
  • -1 Hide
    duckwithnukes , April 23, 2012 4:58 PM
    I was more interested in the peak power consumption difference between Sandy Bridge and Ivy Bridge while running the processors at full load. That's where the real savings in power will be attained.

    It's clear that while idling, there won't be much of a difference.

    Too bad Tomshardware dropped the ball on that one.
  • -7 Hide
    larkspur , April 23, 2012 5:01 PM
    Here is a more in-depth look at overclocking Ivy: http://www.anandtech.com/show/5763/undervolting-and-overclocking-on-ivy-bridge.
  • -6 Hide
    Pezcore27 , April 23, 2012 5:01 PM
    Quote:
    It has been rumored that Ivy Bridge will be more expensive than comparable Sandy Bridge because of limited launch supply for a while. Is that right that Intel really will set Ivy's price low?

    Ivy bridge's prices are expected to be lower than the current SB prices, yes.

    They have an expected pricing guide in the anandtech review.

    http://www.anandtech.com/show/5771/the-intel-ivy-bridge-core-i7-3770k-review/2
  • 0 Hide
    larkspur , April 23, 2012 5:05 PM
    Sry bad link, let's try again: http://www.anandtech.com/show/5763/undervolting-and-overclocking-on-ivy-bridge
  • 0 Hide
    halcyon , April 23, 2012 5:07 PM
    sublime2kNow I'm happy for buying 2500K instead of waiting for IB.

    I went with the 2500K too...but I kinda wish I'd gone with a 2700K...even if it is just for gaming. IB is beyond what I need right now...this month at least.
  • 6 Hide
    gti88 , April 23, 2012 5:10 PM
    I think, I'll upgrade my 775 to Sandy Bridge.
    I was waiting reviews just to be sure.
  • 3 Hide
    hellfire24 , April 23, 2012 5:15 PM
    it's not an 'upgrade',it's just an 'update'.
    don't regret yourself if you have a SB cpu!
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