Building blocks

“Atom” is the brand name for Intel’s newly-launched ultramobile processor line, but it could just as well be the name for Intel’s next-generation 45nm microarchitecture. This new core microarchitecture, codenamed Nehalem, forms the basic building block from which Intel will assemble the brains for everything from high-end servers to svelte notebooks. Insofar as Nehalem represents a lot more than just a new processor, it’s a significant shift for Intel at almost every level.

It’s the bandwidth, stupid

Moore’s Law has given processor designers an embarrassment of transistor riches, and nowhere is that more apparent than in Intel’s 45nm Nehalem processor. Debuting in 4- and 8-core variants later this year, Nehalem packs a ton of hardware into a single processor socket. (Early numbers put the transistor count of a quad-core Nehalem at 781 million; no numbers for the 8-core model have appeared yet.) But trying to feed all of that hardware with the Intel platform’s existing frontside bus architecture would be folly. So, just as importantly, Nehalem also sounds the long-overdue death knell for Intel’s positively geriatric frontside bus architecture