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The Core i7-4770K Review: Haswell Is Faster; Desktop Enthusiasts Yawn

The Core i7-4770K Review: Haswell Is Faster; Desktop Enthusiasts Yawn
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Intel's Haswell architecture is finally available in the flagship Core i7-4770K processor. Designed to drop into an LGA 1150 interface, does this new quad-core CPU warrant a complete platform replacement, or is your older Sandy Bridge-E system better?

Editor’s Note: Eager to show off what it's doing with Intel’s Haswell architecture, system builder CyberPower PC is offering the Tom’s Hardware audience an opportunity to win a new system based on Intel’s Core i7-4770K processor. Read through our review, and then check out the last page for more information on the system, plus a link to enter our giveaway!

Do you know what it’s like to be at the top of your game, the nearest competitor several strides behind? Well, maybe not. But Intel sure does. When it comes to desktop CPUs, the company’s top-end parts continue to stave off AMD's best efforts. That applies to raw performance and efficiency.

We love fast, and we love efficient. But we also like to see healthy competition driving innovation. And again, on the desktop, there’s not enough of that to push Intel. Ivy Bridge-based CPUs are generally a small step up from the generation prior. And although the Sandy Bridge architecture included a number of notable improvements, unprecedented integration gave away Intel’s growing focus on mobility. Even as we got our hands on great features like Quick Sync, Intel was chiseling away at its enthusiast equity by limiting overclocking to K-series SKUs.

Expect more of the same from Haswell. You're going to see notable per-clock performance improvements, faster graphics, and additional features able to accelerate specific workloads. But you’re also going to witness a clumsy handling of overclocking (again), some strange decisions on the graphics side (again), and incremental gains that’ll have some of us upgrading our desktops, but more folks looking for Haswell-powered mobile platforms.

That's entirely by design, by the way. An emphasis on power is front and center with Haswell. And as a result, this architecture is going to span the broadest range of devices Intel has ever touched with one design. But I’ll argue that enthusiasts on the desktop take a back seat to make it all possible.

Meet Haswell, Now Known As Intel’s Fourth-Gen Core Architecture

Intel is rolling out the details of its Haswell-based processors in a staggered launch. The company plans to ship multiple variations of the architecture across a number of different interfaces, from very low-power segments to very performance-sensitive ones. However, the only arrangement emerging today is the quad-core SoC. Technically, Intel is talking desktop and mobile, though we’re deliberately focusing on the Core i7-4770K desktop CPU. I published a preview of Core i7-4770K’s performance almost three months ago, and that story has some information about Intel’s plans as well.

Haswell-based quad-core processors will ship in two configurations to cover the mobile and desktop markets. Only one is ready today, though. That chip features the HD Graphics 4600 engine, also known as GT2. The second, with Iris Pro Graphics 5200 (or GT3e) is coming later. Intel's engineers claim that Iris Pro scales incredibly well given a lofty power ceiling and enough cooling. However, CPUs endowed with the higher-end graphics engine are BGA-only, meaning they’re soldered down. So, enthusiasts buying LGA 1150-equipped motherboards will only find Core i7 and Core i5 CPUs with four cores and HD Graphics 4600 (technically, there’s also a 35 W Core i5 with fewer cores, but it’s still under wraps).

This implementation of Haswell is composed of 1.6 billion transistors, up from a comparable Ivy Bridge configuration’s 1.4 billion. Optimized expressly for Intel’s 22 nm node, the die measures 177 square millimeters, just slightly larger than quad-core Ivy Bridge at 160 mm².

Quad-Core Haswell with GT2Quad-Core Haswell with GT2

Quad-Core Ivy Bridge with GT2Quad-Core Ivy Bridge with GT2

Put Ivy Bridge and Haswell right next to each other and you might have a difficult time telling them apart. After all, there’s “only” a 200 million-transistor delta separating the two. That 14% growth in transistor count largely comes from a 25% increase in graphics resources compared to last generation.

That’s not to say the processor cores go untouched. Intel says it put specific emphasis on speeding up both today’s legacy code as well as applications we’ll see in the future. To that end, larger buffers enlarge the out-of-order window, which means instructions that would have previously waited for execution can be located and processed sooner. Haswell’s window is 192 instructions. Sandy Bridge was 168. Nehalem was 128. The Haswell branch predictor is improved, too. This is something Intel manages to do every generation—and for good reason, since it simultaneously enables better performance and prevents the wasted work of a branch getting predicted incorrectly. Previously, Intel’s architecture was able to execute six operations per clock cycle. However, Haswell gets two additional ports (one integer ALU and one store), enabling up to eight operations per cycle. And workloads with large data sets should see a benefit from a larger L2 TLB.

All of those changes add up to significant improvement in Haswell’s IPC compared to Ivy Bridge. That’s where we expect most of the speed-up in general-purpose apps to come from this generation, since the top-end Core i7-4770K runs at the same 3.5 GHz as -3770K.

Sure enough, when we set five different processors (employing four different architectures) to the same constant 4 GHz, we see, first, how much more work Intel gets done compared to AMD and, second, a steady progression forward in Intel’s performance.

In addition to the two execution ports Intel adds to Haswell, ports one and two now feature 256-bit Fused Multiply-Add units, doubling the number of peak theoretical floating-point operations per cycle. Integer math gets a big boost as well from AVX2 instruction support.

Of course, multiplying the architecture’s compute potential means little if you can’t get data into the core fast enough. So, Intel also made a number of changes to its caches. Haswell’s L1 and L2 caches are the same size as they were in Ivy Bridge (there’s a 32 KB L1 data, 32 KB L1 instruction, and 256 KB L2 cache per core). Bandwidth to the caches is up to doubled, though, and we’ll see in our synthetic testing that the L1D is indeed quite a bit faster. Intel claims that it can do one read every cycle from the L2 (versus one read every other cycle in Ivy Bridge), but we aren’t able to replicate those figures in our own testing.


Cores / Threads
Base Freq.
Max. Turbo
L3
HD Graphics
Graphics Max Freq.
TDP
Price
Fourth-Gen Core i7 Family
4770T
4/8
2.5 GHz
3.7 GHz
8 MB
4600
1,200 MHz
45 W
$303
4770S
4/83.1 GHz
3.9 GHz
8 MB46001,200 MHz65 W
$303
4770
4/83.4 GHz
3.9 GHz
8 MB46001,200 MHz84 W
$303
4770K
4/83.5 GHz
3.9 GHz8 MB46001,250 MHz84 W
$339
4770R
4/83.2 GHz
3.9 GHz6 MB
Iris Pro 5200
1,300 MHz65 W
N/A
4765T
4/82.0 GHz
3.0 GHz
8 MB46001,200 MHz35 W
$303
Fourth-Gen Core i5 Family
4670T
4/4
2.3 GHz
3.3 GHz
6 MB
46001,200 MHz45 W
$213
4670S
4/43.1 GHz
3.8 GHz
6 MB46001,200 MHz65 W
$213
4670K
4/43.4 GHz
3.8 GHz
6 MB46001,200 MHz84 W
$242
4670
4/43.4 GHz
3.8 GHz
6 MB46001,200 MHz84 W
$213
4570
4/43.2 GHz
3.6 GHz
6 MB46001,150 MHz
84 W
$192
4570S
4/42.9 GHz
3.6 GHz
6 MB46001,150 MHz65 W
$192


The Core i7-4770K gives us an 8 MB shared L3 cache, similar to Core i7s before it. Although the Sandy and Ivy Bridge designs employed a single clock domain that kept the cores and L3 running at the same speed, Haswell decouples them. Our cache bandwidth benchmark reveals a slight hit to L3 throughput, though improvements elsewhere in the System Agent keep the results fairly even.

Haswell offers the same 16 lanes of PCI Express 3.0 connectivity as Ivy Bridge, and validated memory data rates up to 1,600 MT/s. The desktop line-up’s thermal targets are quite a bit different as a result of Intel’s fully-integrated voltage regulator, but an upper bound of 84 W isn’t extreme by any stretch and a floor of 35 W is pretty familiar.

All of Intel’s upgradable processors now drop into an LGA 1150 interface, meaning any decision to adopt Haswell is also going to require a motherboard purchase, at least. So, before you drop several hundred dollars on a brand new platform, let’s figure out if Core i7-4770K is worth the investment.

Display all 410 comments.
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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