Feeds

AMD Bulldozer core to weave multiple threads

But not the way Intel's HyperThreading does so

Mobile application security vulnerability report

AMD's 'Bulldozer' core design will incorporate some kind of simultaneous multithreading (SMT) technology, it has emerged. But it's not going to be like Intel's HyperThreading the smaller chip maker has insisted.

This week, AMD showed off its 'Magny Cours' chip architecture, a design that crams in six of the cores found on its 'Istanbul' chips, each with 512KB of their own L2 cache and 6MB of shared L3 cache.

An architecture roadmap revealed at the Hot Chips conference shows the 45nm processor - out next year in its initial form - will soon evolve into a 12-core beast with 12MB of L3. It'll gain a four-channel 1333MHz DDR 3 controller along the way - Istanbul has a two-channel controller the peaks at 1066MHz DDR 2.

It's not clear whether the 12-core Magny Cours will use the Bulldozer core from the word go, or get it in a subsequent revision.

Either way, Bulldozer itself will deliver the ability to handle multiple threads simultaneously, EE Times reports after a chat with Pat Conway, principal member of technical staff at AMD.

He didn't say much more - and AMD has subsequently stated for the record that it has made no formal announcement on adding SMT to Bulldozer - though he did indicate AMD's approach will operate "in a different fashion than HyperThreading".

HT allows a second thread access to core resources that have not been called upon by the first thread. That's not always possible, which is why HT delivers a performance boost generally well below that of adding a further physical core: improvements of 15-30 per cent and up to 80 per cent, respectively.

Intel's approach isn't the only one, and SMT is implemented in a number of different ways in MIPS, IBM Power and Sun Sparc processors. ®

Boost IT visibility and business value

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
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
Cheer up, Nokia fans. It can start making mobes again in 18 months
The real winner of the Nokia sale is *drumroll* ... Nokia
Microsoft unsheathes cheap Android-killer: Behold, the Lumia 530
Say it with us: I'm King of the Landfill-ill-ill-ill
prev story

Whitepapers

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.
How modern custom applications can spur business growth
Learn how to create, deploy and manage custom applications without consuming or expanding the need for scarce, expensive IT resources.
Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
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.