Skip to navigation

Intel Haswell review


An all-new processor architecture brings upgrades across the board, with beefed-up graphics and numerous power-saving optimisations

Review Date: 4 Jun 2013

Reviewed By: Darien Graham-Smith

Price when reviewed: Various

After more than 18 months of anticipation, the Intel Haswell architecture is finally here. Haswell – officially known as 4th Generation Intel Core – promises to reduce power requirements and boost performance, especially in the arena of graphics.

Haswell Ultrabooks

Ultrabooks using Haswell CPUs must meet new hardware requirements, including a touchscreen, wireless display technology and an idle battery life of at least nine hours. Laptops that don’t meet these requirements can't use the Ultrabook brand.

Haswell chips are built on the same 22nm process as Ivy Bridge, so the power savings aren’t achieved through miniaturisation. They’re the result of two technical innovations. The first is a new power management framework, which lets the CPU handle device driver events in scheduled batches, rather than in real time, so it can spend more time powered down between bursts of activity. Intel estimates this improvement can cut power consumption on a regular laptop by around 20%.

The second innovation is a structural change. In low-power processors aimed at Ultrabooks and tablets – denoted by model numbers suffixed with U and Y – the chipset has been moved into the CPU package. This reduces the amount of energy wasted as heat, and gives the processor better control over its power budget. Intel says this allows a “20x” increase in battery life, although in reality this applies only to laptops or tablets in standby mode.

Desktop performance

When it comes to actually running code, Haswell brings numerous architectural improvements over previous designs. For the technically minded, these include better branch prediction, a larger translation lookaside buffer, improved out-of-order execution capabilities and a doubling of cache bandwidth. The updated AVX2 instruction set brings new functions, too. In theory, this should give fourth-generation processors a performance edge over their Ivy Bridge forebears in almost every application.

So it proves with the first Haswell chip to emerge, the Core i7-4770K. As the name suggests, this is a direct successor to the Ivy Bridge i7-3770K, and like its predecessor, it’s a desktop quad-core chip – supporting eight threads, thanks to Intel’s Hyper-Threading technology – with a base frequency of 3.5GHz and 8MB of L3 cache. It isn’t a drop-in replacement for the old chip, however: Haswell desktop processors use the new LGA 1150 socket and a new 8 Series chipset.

When benchmarked in Windows 7 with 8GB of RAM, this top-of-the-range model scored 1.16 overall, with respective scores of 1.09, 1.22 and 1.17 for responsiveness, media and multitasking. That’s a fair lick faster than the Ivy Bridge Core i7-3770K, which scored 1.06 in an identical configuration, and well ahead of AMD’s most powerful desktop processor, the FX 8350, which scored 0.95.

Desktop performance gets a modest but welcome boost

Stepping up to Windows 8 knocked 10% off the i7-4770K’s responsiveness score, but nonetheless, the system scored a respectable 1.12 overall. It’s reasonable to expect a comparable step up in speed, compared to the previous generation, across all Haswell chips.

Since this particular processor is a “K” model, you can also overclock its Turbo multipliers; we found the chip ran stably using its stock cooler with its maximum Turbo speed turned up from 3.9GHz to 4.4GHz. This allowed the system to achieve an overall score of 1.25, including a stellar 1.36 score in our media test.

1 2
Subscribe to PC Pro magazine. We'll give you 3 issues for £1 plus a free gift - click here
User comments


Nice review, thanks Darien. Any idea when we can actually buy one of these and the requisite motherboards? I need a new PC and have been waiting for Haswell for some time.

By SirRoderickSpode on 1 Jun 2013

Slower in Windows 8?

Do we know why there is a drop in performance on Windows 8?

By Lee_Grant on 1 Jun 2013


Hmm, my second generation Core i laptop got a speed increase with Windows 8, or at least it feels more responsive.

Can you give more information on how you measure responsiveness?

By big_D on 2 Jun 2013

What a nonsense

"Intel says this allows a “20x” increase in battery life"

I hear promises of "up to xxx times longer battery life", and my laptop works for around 4 hours just like it did 10 years ago. Marketing bull****t

By radnor on 3 Jun 2013

Gaming is still out of the question

Also I'd like to point out that Crysis was released in 2007. It's not a "modern game" by any standards.

By radnor on 3 Jun 2013

3D performance

You helpfully provide an AMD processor for reference in your desktop performance graph on page 1 of this review. So why is the same AMD processor not included in your 3D performance graph on page 2?

By Kuryakin on 3 Jun 2013

3D performance


Intel's graphs?

By Mat1971 on 3 Jun 2013

Blackadder analogy

In blackadder goes forth there is a moment when the sum total of months of battle resulted in moving General Haig's desk 3ft closer to Berlin. New Intel processors are almost as exciting. But I suppose a 9% generation-generation improvement by Intel is better than AMD's 4%.

By milliganp on 5 Jun 2013

More of the same

We’ve been stuck at or around the 3 GHz mark now for over 10 years, surely we should all be on 10 GHz CPU’s by now even if it meant larger chips.

Someone need to give Intel a kick up the backside, no wonder desktop PC’s aren’t selling.

By dholbon on 6 Jun 2013


increasing clock speeds would be nice but its really the architecture and improvements to instructions which benefit cpus
i cant even imagine how dreadful a 10ghz Pentium 4 would be compared to our modern 3ghz dual cores

By Emodan666 on 6 Jun 2013

Leave a comment

You need to Login or Register to comment.


Latest Category Reviews
Intel Devil's Canyon review

Intel Devil's Canyon

Category: Processors
Rating: 5 out of 6
Price: £263
AMD Kaveri review

AMD Kaveri

Category: Processors
Rating: 4 out of 6
Price: £0
AMD Richland review

AMD Richland

Category: Processors
Rating: 5 out of 6
Price: £115
AMD Trinity review

AMD Trinity

Category: Processors
Rating: 5 out of 6
Price: £91
AMD A8-3870K review

AMD A8-3870K

Category: Processors
Rating: 4 out of 6
Price: £79
Compare reviews: Processors


Most Commented Reviews
Latest News Stories Subscribe to our RSS Feeds
Latest Blog Posts Subscribe to our RSS Feeds
Latest Features
Latest Real World Computing


Sponsored Links


Your email:

Your password:

remember me


Hitwise Top 10 Website 2010

PCPro-Computing in the Real World Printed from

Register to receive our regular email newsletter at

The newsletter contains links to our latest PC news, product reviews, features and how-to guides, plus special offers and competitions.