Intel Core i7 3960X review

  • £750

The ultimate desktop processor could actually be even more ultimate

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Intel core i7 3960x

What to make of Intel's new flagship processor and platform, the Intel Core i7-3960X?

On the one hand, it's clearly the fastest PC processing solution money can buy. By some metrics, such as memory bandwidth, it absolutely blows away even Intel's own six-core Gulftown processors such as the Core i7-980X.

It also brings a healthy improvement in overclocking headroom. We've little doubt that stable systems running at 5GHz or more will be possible with water cooling. Platform upgrades that include more PCI Express lanes and a faster SATA interface are also welcome.

However, in more realistic tests of application performance, the gap to Intel's outgoing flagship processor and platform is rather more prosaic.

What makes this frustrating is that the Core i7-3960X is very probably capable of the kind of massive performance boost we expect from a new high-end Intel processor.

Deep down, the specs don't lie.

Intel quotes the transistor count at 2.27 billion. That's nearly double the number of transistors in a Gulftown processor, despite the same nominal core count. Admittedly, the Core i7-3960X has 3MB of additional cache and a few more on-die features. But that's not enough to explain away all of the additional one-billion-plus transistors.

The explanation, of course, is that the Core i7-3960X is actually an eight-core processor with a pair of cores disabled.

When you're paying the thick end of £750, it's very hard to accept the idea that Intel is holding something back.

The question that immediately follows is whether there will be any scope for core unlocking, as with processors made by AMD. In our view, it's extremely unlikely. For that to be the case, Intel would have to be under extreme pressure from AMD.

In reality, the opposite is true.

The lack of Quick Sync is another downer. There are good architectural reasons why Quick Sync doesn't appear. But that's Intel's problem, not the customer's.

And customers of the Core i7-3960X have every right to expect full access to the product they've paid handsomely for.

We liked

If you want the fastest processor on the planet, look no further.

Most impressive is the additional overclocking headroom Intel has delivered over the old six-core chip. Platform upgrades including more PCI-E lanes and SATA 6Gbps are welcome, too.

We disliked

Simple, it's those hidden cores.

We want them switched on and we want them switched on now. Until that happens, the Core i7-3960X will remain a deeply, deeply unsatisfying chip, especially in the context of its sky-high pricing.

Final verdict

Ultimately, the reason why the Core i7-3960X looks like it does comes down as much to the performance of Intel's main competitor, AMD, as it does anything else.

Had AMD's new Bulldozer architecture been the game changer we had been hoping for, it's hard to imagine Intel would have released the Core i7-3960X with a pair of hidden cores. It would have run the full eight cores.

We feared AMD's ongoing inability to challenge at the top of the performance tables would eventually lead to Intel sand bagging. With the Core i7-3960X, it's finally happened. And that's a shame.

Tech Specs

Product TypeProcessor
Processor CoreHexa-core (6 Core)
Thermal Design Power130 W
Processor ManufacturerIntel
Product FamilyCore i7 i7-3900
L3 Cache15 MB
Clock Speed3.30 GHz
Processor SocketSocket R LGA-2011
Brand NameIntel
Green CompliantYes
Green Compliance Certificate/AuthorityRoHS
64-bit ProcessingYes
Thermal Specification66.8°C
Direct Media Interface5 GT/s
Overclocking Speed3.90 GHz
Width52.5 mm
Depth45 mm
L2 Cache1.50 MB
Product Seriesi7-3900
ManufacturerIntel Corporation
Product Modeli7-3960X
Product NameCore i7 Hexa-core i7-3960X 3.3GHz Desktop Processor
Package TypeRetail
Product LineCore i7
Manufacturer Part NumberBX80619I73960X
Manufacturer Website Addresshttp://www.intel.co.uk
Marketing Information

Intel Core i7 Processor Best-in-Class Performance
The Intel Core i7 processor delivers best-in-class performance for the most demanding applications. This quad-core processor features Intel Turbo Boost Technology 2.0, 8-way multitasking capability, and additional L3 cache.

Process Technology32 nm
Limited Warranty3 Year