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Intel's Next-Gen CPUs: Penryn and Nehalem March 28, 2007 Brandon Sandman Bell |
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Summary: Today Intel disclosed more info than ever about their upcoming next-generation CPUs after Core 2. Read all the details in this article!
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With Q1’07 winding down, today Intel’s Pat Gelsinger, general manager of Intel’s Digital Enterprise Group, held a briefing with press disclosing more info about Intel’s upcoming next-generation processors than ever before. We’ve summarized the highlights of the briefing in this quick article.
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Intel’s Penryn family of Core 2 CPUs
As you no doubt know by now, Penryn is the codename for Intel’s upcoming successor to today’s Core 2 CPUs. Penryn represents a wide family of products, ranging from mobile processing to replacing today’s Conroe-based and Kentsfield-based Core 2 CPUs on the desktop. Penryn CPUs are based on Intel’s upcoming 45-nm high k+ metal gate process technology, allowing Intel to cram more transistors into the processor’s die without significantly increasing its size. According to Intel, the new 45-nm process gives them twice the transistor budget, this allows them to add performance enhancing features such as larger L2 caches while still delivering a cost effective die size. Intel’s quad-core variant of Penryn for instance will contain approximately 820 million transistors, while the dual-core variant of Penryn will have a die size of just 107 square millimeters.
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Intel has incorporated a number of architectural enhancements into Penryn that are designed to deliver clock-for-clock performance enhancements over today’s Core 2 CPUs at a given clock speed. One key new technology Intel has incorporated into Penryn is their Fast Radix-16 divider. Intel’s Radix-16 divider is a new divider technique providing double the divider speed over previous processors when handling math computations (both floating-point and integer operations): 4-bits processed per cycle in Penryn versus 2-bits per cycle in today’s processors.
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Penryn will also support Intel’s SSE4 instructions. This should improve the processor’s performance when dealing with multimedia apps (such as photo imaging, video encoding, etc) and games that have been designed with SSE4 in mind. Incorporating alongside this is Penryn’s new super shuffle engine. This is a 128-bit wide, single-pass shuffle unit that will improve Penryn’s performance with SSE2, SSE3, and SSE4 instructions that have shuffle-like operations. Penryn processors can perform these operations in a single cycle.
Penryn also features Intel’s enhanced virtualization technology. Intel claims machine transition times have been improved from 25-75%.
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For mobile Penryn processors, Intel has developed their enhanced dynamic acceleration technology for single-threaded apps. The idea is to boost performance for software applications that aren’t multi-threaded. In these apps, the second core is left idling; when this occurs, Intel’s dynamic acceleration technology kicks in, bumping up the clock frequency (beyond the stock CPU speed) on the processor core that is being used while the second core idles. Intel has also added a new power management state for mobile Penryn processors to reduce power consumption when the system is idle.
Larger caches, faster FSB
Penryn processors will feature considerably larger, more associative caches than today’s Core 2 CPUs. Dual-core Penryn CPUs will ship with up to 6MB of L2 cache while quad-core processors will contain up to 12MB of L2 cache.
On the front-side bus, Intel is also expected to crank up the speed. During today’s press briefing, Intel confirmed a 1600MHz FSB speed for Xeon processors, while desktop Penryn processors will be outfitted with a 1333MHz FSB. Overall clock speeds will also be significantly higher than today’s Core 2 CPUs. While Intel wouldn’t outline anything specific, they did confirm that desktop Penryn CPUs will ship at speeds greater than 3GHz at launch.
Intel plans to deliver a total of six Penryn processors including dual and quad-core desktop processors and a dual core mobile processor, all which will be sold Core processor brand name. Four of these processors will be in production by the second half of 2008.
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Nehalem: Intel’s next brand new architecture
After Penryn, Intel plans to ship their next-gen architecture codenamed Nehalem, which will begin production in 2008. Not as much was disclosed about Nehalem. Arguably Intel’s most significant announcement was that Nehalem will offer an enhanced version of their Hyper-Threading technology, allowing Nehalem to process up “1-16+ threads” while utilizing just “1-8+” cores. This will allow Nehalem to deliver enhanced performance without dramatically increased power consumption. Intel also disclosed that Nehalem will incorporate an integrated memory controller and a multi-level shared cache architecture. This is similar to AMD’s plans for Barcelona, with the L3 cache shared among the processing cores.
Intel even plans to provide an integrated graphics option of Nehalem, incorporating the graphics engine onto the CPU itself, just as AMD intends to do with their “Fusion” line of processors. With so many similarities, it will be interesting to see how the two stack up against one another.
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Final thoughts
Intel’s roadmap appears to be on schedule and with the performance additions inside Penryn, they’ll have a solid successor to today’s Core 2 processors, widely acknowledged by all to be the fastest processors on the market today. During today’s press briefing, Intel disclosed a 20% performance improvement for Penryn in games (this is comparing a Core 2 X6800 to a 3.2GHz Penryn CPU) and 40% improvement in video encoding when SSE4 is used.
How this will compare to AMD’s upcoming Barcelona processors is anyone’s guess at this point, but it appears that the two competing architectures will be quite competitive with one another. Right now it appears AMD may get Barcelona out the door ahead of Intel, but to be honest, we really won’t see volume shipments of either until sometime in 2008. In the meantime, expect more price drops and product introductions of today’s existing architectures.