Intel Core i7 3770K review

The fastest real-world CPU on the market right now

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When Intel launched the Nehalem generation of Core processors (like the heavyweight Core i7 980X), one of TechRadar's contacts deep inside the world's biggest chip maker told us it was all about fruit picking.

Bear with us.

What he meant was low-hanging fruit – the easy stuff. That meant moving the memory controller on-die and generally moving to a modern, high bandwidth processor architecture.

The result was a much faster processor than the Conroe chips it replaced.

Thing is, you only get the benefit of moving doing things like moving memory controllers on-die once.

So with the second generation Sandy Bridge architecture, it was all about the harder, finer detail work. And a very good job Intel did, too. In truth, the per-core performance of Sandy Bridge was well beyond anything we expected.

And so today we have Ivy Bridge, a die shrink rather than an all-new architecture.

And yet Intel is calling it the third generation Core architecture.

Intel Core i7 3770K
No extra cores and no extra clock speed

Well, the truth is, this Intel Core i7 770K is barely any faster than existing Sandy Bridge chips like the Core i7 2600K. Given how well optimised Sandy Bridge already is, that's not a surprise.

That said, we had hoped the new 22nm process would enable higher overclocks, much lower power consumption or maybe a bit of both. On this first viewing, it doesn't deliver much of either.

In fact, it's Ivy Bridge's graphics that Intel says justifies the "third generation" label, not the CPU cores. Fair enough, let's have a look.

The Intel Core i7 3770K gets the top HD Graphics 4000 core. With 16 execution units where the old Core i7s had but 12, you're looking at a third more hardware. Each unit has also been made more powerful and given DirectX 11 support.

The result is more performance, as much as 40 per cent more in our tests.

Intel Core i7 3770K
The processor graphics take up a lot more room on-die

If that sounds impressive – and 40 per cent is a big increase – the problem is the starting point, which was well below what we'd call playable gaming performance. With the Ivy Bridge upgrade Intel has lifted graphics performance to what we'd now describe as barely tolerable.

The reality is that if you are remotely serious about games, you need a proper graphics card.

It's that simple.

As for the revised QuickSync video transcode core, it's roughly 10 per cent faster than before.

Which means it's ridiculously fast when it's working – about five times faster than encoding video on the CPU cores. But just like general purpose processing on AMD and NVIDIA's graphics chips, with limited software support it's always been had to get really excited about QuickSync. Ivy Bridge doesn't change that.

We liked

It's hard to imagine any desktop PC user ever needing more performance than the new Intel Core i7 3770K serves up.

On a per-core level, there isn't a faster processor available. And with four cores and eight threads, there's multi-threaded performance to burn.

The new HD Graphics 4000 core is a big step forward, too.

We disliked

As far as CPU performance, Ivy Bridge represents something of a stalling.

This is still a very fast CPU. It's just not much quicker than the processor it replaces. It's also not dramatically more power efficient and doesn't overclock any better.

Graphics aside, it's not a significant step forward.


A quick chip, but Ivy Bridge is proof that Intel is no longer terribly interested in the desktop PC.

Tech Specs

Product TypeProcessor
Processor CoreQuad-core (4 Core)
Thermal Design Power77 W
Processor ManufacturerIntel
Graphics Controller ManufacturerIntel
Graphics Controller ModelHD 4000 Graphics
Product FamilyCore i7 i7-3700
L3 Cache8 MB
Clock Speed3.50 GHz
Processor SocketSocket H2 LGA-1155
Brand NameIntel
Green CompliantYes
Green Compliance Certificate/AuthorityRoHS
64-bit ProcessingYes
Thermal Specification67.4°C
Number of Monitors Supported3
Direct Media Interface5 GT/s
Overclocking Speed3.90 GHz
Width37.5 mm
Depth37.5 mm
L2 Cache1 MB
Product Seriesi7-3700
ManufacturerIntel Corporation
Product Modeli7-3770K
Product NameCore i7 Quad-core i7-3770K 3.5GHz Desktop Processor
Package TypeRetail
Product LineCore i7
Manufacturer Part NumberBX80637I73770K
Manufacturer Website Address
Marketing Information

A new PC can provide you with unique and expanded capabilities. And when it is powered by a visibly smart 3rd generation Intel Core processor, it can deliver amazing performance. Smart features give your PC the ability to adapt to your needs, as well as stunning visuals built-in for an enhanced experience that you can both see and feel. You can enjoy a wide selection of entertainment, create and share your great memories, and explore and connect to what interests you most. Rediscover what's possible with a new computer. The only thing more amazing than our technology is what you'll do with it.

Process Technology22 nm
Limited Warranty3 Year