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Overclocking Haswell: You’ll Pay For That

The Core i7-4770K Review: Haswell Is Faster; Desktop Enthusiasts Yawn
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If you purchase one of the two K-series parts in Intel’s Haswell-based portfolio (and you have a Z87-based motherboard), you’ll have access to the same knobs and dials that were available from the Core i7-3770K and i5-3570K, with one notable change: the BCLK ratios popularized by X79 Express are back, facilitating some manipulation of the number that gets multiplied against the clock ratio. Intel exposes 1.0x, 1.25x, 1.67x, and 2.5x straps.

There’s a colossal difference between what Haswell-based LGA 1150 processors can do in theory, and what they can do after Intel’s product guys get done disabling the bits and pieces to create a differentiated stack, though.

Overclockers maintain control over core frequency using ratios up to 80x in 100 MHz increments. The on-die graphics engine is also adjustable in 50 MHz increments via ratios as high as 60x. Further, the memory controller is technically unlocked, allowing options for 200 and 266 MHz steps with a logical ceiling at 2,933 MT/s. Finally, the platform controller hub’s clock generator is unlocked too, supporting frequencies as high as 200 MHz.

But as with generations past, there remains a relationship between the DMI clock and PCI Express clocks—and you want PCI Express to stay as close to 100 MHz as possible. So, Intel implements 5:5, 5:4, 5:3, and 5:2 ratios to maintain constant PCIe clocks with a variable BCLK. Unlike the LGA 2011 platform, which used the CPU to adjust those ratios, Haswell requests this from the PCH. The outcome is similar, though. Expect a useable range between 5-7% around the ratio you choose for fine-tuning your overclock.

That’d all be well and good if Intel was enabling this new level of flexibility for the folks who don’t spend extra on K-series parts, giving them the ability to pick higher BCLK settings without access to the ratio multiplier. However, the company instead chooses to restrict the ratios to the Core i7-4770K and i5-4670K—the same ones you can already overclock in 100 MHz increments. Anyone buying one of the 11 other SKUs in Intel’s new Core i7 and i5 line-up is out of luck.

Overclocking Core i7-4770K

Moving on, what can you expect from a Core i7-4770K, in terms of overclocking headroom? We have a couple in the lab, and are getting 4.7 GHz, at most, across all cores using Prime95 to test for stability. However, those samples come from Intel. We were much more interested in feedback from someone with many, many retail parts at their disposal.

Our first-hand information involves a high double-digit number of processors, including samples and final shipping boxed CPUs. Sort testing was limited to 1.2 V to keep heat manageable. Ring/cache ratios are pegged at 3.9 GHz, with the memory controller operating at 1,333 MT/s. Of the chips available for sorting, only one is stable at 4.6 GHz under full load. A few are capable of operating at 4.5 GHz. More run stably at 4.4 GHz. Most are solid at 4.3 GHz and down. As you stretch above a 1,600 MT/s memory data rate or a ring ratio to match your highest single-core Turbo Boost ratio (which helps maximize performance), your top stable core frequency tends to drop.

Load-line calibration has very little, if any, effect with Haswell. There’s simply less flexibility to coax a killer overclock out of one of these CPUs using levers that were popular previously. Although the most enthusiast-friendly motherboards still include pages of options, a number of them simply don’t do anything beneficial. Flatly, it sounds like engineers and enthusiasts alike are still trying to figure out what the more obscure settings actually do.

We’re going to have to accept that Haswell-based parts get hotter, faster, it sounds like, and that they might fall a few hundred megahertz short of comparable Ivy Bridge-based parts with conventional cooling methods. It’s a good thing, then, that the architecture is inherently faster to help compensate.

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Top Comments
  • 53 Hide
    016ive , June 1, 2013 7:41 AM
    Intel made the Sandy bridge because of the phenom X6, without competition from AMD Intel will make small improvements every generation to make more money :( 
  • 48 Hide
    thiemo56 , June 1, 2013 7:14 AM
    Dissapointing, not worth it to upgrade over sandy or ivy bridge.
  • 43 Hide
    thiemo56 , June 1, 2013 7:14 AM
    And they overclock so low.
Other Comments
  • 48 Hide
    thiemo56 , June 1, 2013 7:14 AM
    Dissapointing, not worth it to upgrade over sandy or ivy bridge.
  • 43 Hide
    thiemo56 , June 1, 2013 7:14 AM
    And they overclock so low.
  • 3 Hide
    Danny N , June 1, 2013 7:16 AM
    Biggest question is if its worth upgrading my cpu i5 750 4.0ghz to Haswell or my gfx card ati 5870 to nvidia 7xx, my main pc use is for Maya, After FX and some fps gaming. Any input would be appriciated cause I'm leaning towards a cpu upgrade atm.
  • 15 Hide
    bergami , June 1, 2013 7:29 AM
    I want to know more about Iris
  • 20 Hide
    envy14tpe , June 1, 2013 7:34 AM
    Seriously. What did people expect? Of course it's better but nothing out of the ordinary for Intel.
  • 5 Hide
    enewmen , June 1, 2013 7:35 AM
    For me it's not about the 10% gain over SB. It's more like a huge gain over a C2Q, floating point performance over SB (should matter later), and lower watts. I hope THG can expand the Power Consumption and Media Encoding later - check the Watts idle more and fast quick-sync media encoding quality loss. My 2 cents..

    EDIT:
    other sites have reported much lower watts idle, so a lot doesn't make sense or the 4770k has a very slow throttle.
    http://hexus.net/tech/reviews/cpu/56005-intel-core-i7-4770k-22nm-haswell/?page=15
    http://www.techspot.com/review/679-intel-haswell-core-i7-4770k/page13.html
  • 29 Hide
    envy14tpe , June 1, 2013 7:35 AM
    thiemo56Dissapointing, not worth it to upgrade over sandy or ivy bridge.

    Of course not. No one should upgrade from Sandy or Ivy to this, unless you are the 1%.
  • 53 Hide
    016ive , June 1, 2013 7:41 AM
    Intel made the Sandy bridge because of the phenom X6, without competition from AMD Intel will make small improvements every generation to make more money :( 
  • 12 Hide
    sl6 , June 1, 2013 7:46 AM
    I was looking to make a new system based around this. Looks like Ivy-E will be more promising for the FPS.
  • -4 Hide
    tomfreak , June 1, 2013 7:50 AM
    Still dont get it, can we still OC the lock CPU via BCLK?
  • 26 Hide
    anort3 , June 1, 2013 7:51 AM
    Well crap. And early overclocking looked so good.
  • 3 Hide
    mayankleoboy1 , June 1, 2013 7:53 AM
    1.4770K sucks harder than the preview showed it to be.

    2. Another thing i noticed, the FX8350 was a big total energy hog. That is one point AMD fanbois dont talk.

    3. Chris , no specialized AVX2 softwares ? No AVX enabled Handbrake in tests ?
    4. Would have liked to see some -/AVX2 compiled software in here. Maybe left for another "compiler tuning on Haswell piece" ?
  • 16 Hide
    DAsianFatass , June 1, 2013 7:54 AM
    016iveIntel made the Sandy bridge because of the phenome X6, without competition from AMD Intel will make small improvements every generations to make more money

    Yeah, I agree with ya. Without competition there is no innovation. As for intel, "I am disappoint"
  • 14 Hide
    unknown9122 , June 1, 2013 7:56 AM
    I still don't get why intel went with a new socket if they consider the desktop to be "dying"... I think this is AMDs chance to shine
  • 6 Hide
    thasan1 , June 1, 2013 7:56 AM
    is it me or the most exiting news in this review powerPC thing and im not even from US.......
  • 8 Hide
    Icecweam7 , June 1, 2013 8:04 AM
    Is Intel changing its ways to now slownevate the industry? What is Intel's R&D doing? Are they too busy counting their bonuses, stocks, cigars, wine, tee time golf, and vacation trips? *Looks skyward with palm to the face and many yawns
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