Feeds

Happy 40th birthday, Intel 4004!

The first of the bricks that built the IT world

The Power of One Brief: Top reasons to choose HP BladeSystem

Feeling the strain

But before it did, there was work to be done on process technology, and the introduction of the first of the three major post-scaling technologies that Mark Bohr talked about: strained silicon.

Intel Pentium II

Intel Pentium II: 233MHz, 266MHz, or 300MHz; 0.35-micron process (click to enlarge)

In a highly simplified nutshell, strained silicon involves the material being stretched – or strained – in such a way as to pull the individual silicon atoms apart from one another. Doing so frees up the electrons and holes in the material, increasing their mobility substantially, thus allowing for lower-power transistor designs.

Although strained silicon had been under investigation at MIT and elsewhere, the early techniques were was biaxial – that is, the entire silicon lattice was stretched. Intel's breakthrough was the development of uniaxial stretching. Biaxial straining was good for nMOS but bad for pMOS, both of which need to be balanced for good transistor performance.

Biaxial straining also had problems with source drain and defects, Bohr told us – "not a very manufacturable technology". The uniaxial approach, however, could be applied "just to the pMOS device," Bohr said, "and it didn't have any significant yield issues, so it turned out to be both a high-performance solution and a good manufacturing solution."

Intel Pentium III Xeon

Intel Pentium III Xeon: 600MHz to 1GHz, 0.18-micron process (click to enlarge)

But back to the departure and then the return of P6.

The follow-on architecture to P6 was NetBurst, and it was not exactly Intel's finest hour. By the time P6 had evolved into the Pentium III, its pipeline was just 10 stages long; NetBurst doubled that to 20 stages in the Willamette Pentium 4 in 2000, and increased that "Hyper Pipelined Technology" to 31 stages in the Prescott Pentium 4 in 2004 – which, by the way, was the first processor to use Bohr's 90nm strained silicon process technology.

According to Pawlowski, the reason for the deeper pipeline was "frequency, frequency, frequency". In a bit – well, more than a bit – of an oversimplification, deep pipelines require higher frequencies to achieve the same performance as architectures with shorter pipelines.

Using blade systems to cut costs and sharpen efficiencies

More from The Register

next story
Report: American tech firms charge Britons a thumping nationality tax
Without representation, too. Time for a Boston (Lincs) Macbook Party?
iPad? More like iFAD: We reveal why Apple ran off to IBM
But never fear fanbois, you're still lapping up iPhones, Macs
Apple gets patent for WRIST-PUTER: iTime for a smartwatch
It does everything a smartwatch should do ... but Apple owns it
Apple orders huge MOUNTAIN of 80 MILLION 'Air' iPhone 6s
Bigger, harder trouser bulges foretold for fanbois
Child diagnosed as allergic to iPad
Apple's fondleslab is the tablet dermatitis sufferers won't want to take
Microsoft takes on Chromebook with low-cost Windows laptops
Redmond's chief salesman: We're taking 'hard' decisions
For Lenovo US, 8-inch Windows tablets are DEAD – long live 8-inch Windows tablets
Reports it's killing off smaller slabs are greatly exaggerated
prev story

Whitepapers

Seven Steps to Software Security
Seven practical steps you can begin to take today to secure your applications and prevent the damages a successful cyber-attack can cause.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Build a business case: developing custom apps
Learn how to maximize the value of custom applications by accelerating and simplifying their development.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.