Intel will offer a first
look at technical details of its low-power Silverthorne processor during a presentation
at the International Solid State Circuits Conference (ISSCC) this week, setting
the stage for a concerted push into the market for ultraportable devices.

"This is the first detailed technical presentation on Silverthorne,"
said Justin Rattner, Intel's chief technology officer and director of the company's
Corporate Technology Group.

Silverthorne is the first x86 chip designed by Intel specifically for small,
portable computers. Until now, the company has taken older processors originally
designed for notebooks and adapted them for use in portable devices. For example,
Intel's existing A100 and A110 processors designed for these devices are based
on the Celeron M chip.

Intel's ISSCC presentation on Silverthorne was anticipated. The
conference program contained a presentation abstract that described an unnamed
45-nanometer, low-power Intel processor designed for mobile Internet devices.
That description is the same that Intel used to describe Silverthorne, although
the company earlier declined to confirm or deny if the chip was in fact Silverthorne.

Unlike other processors in Intel's current product line, Silverthorne uses
an in-order processor design, akin to a factory with a single assembly line
capable of processing one operation at a time. The chip is the first in-order
processor released by Intel since it began shipping the Pentium Pro in 1995.
Other Intel processors use an out-of-order design.

Out-of-order chips work like a factory with multiple assembly lines. They can
process several operations at the same time and generally offer better performance
than in-order processors. Silverthorne will make up some of this difference
by using Hyperthreading, a technology that allows the processor to work on two
instruction threads at the same time.

Using an in-order design for Silverthorne struck the best balance between performance
and power efficiency, Intel said. But don't expect Silverthorne to match the
performance available from Intel's mobile Core 2 processors, even though Silverthorne
consumes less power. The performance of the new chips will be roughly equivalent
to the Pentium M processors found in the first version of Centrino, released
in 2003, Rattner said.

Intel declined to comment on what clock speed Silverthorne will run at or how
much power it will consume when it hits the market in the coming months. But
the ISSCC program abstract said the chip will have 512K bytes of cache and use
a 533MHz front-side bus.

Observers had expected Intel to offer dual-core and single-core versions of
Silverthorne, but Rattner said Silverthorne will have one core.

Over the life of the Silverthorne processor, Intel expects to make a 2GHz chip
available and plans to offer a version that consumes 1 watt, Intel said, suggesting
these will not be features of the processors set for release in the months ahead.

When Silverthorne hits the market, it could face competition from Via Technologies'
Isaiah processor, a low-power chip that is set for release at around the same
time and is designed for the same portable devices makers that are Silverthorne's
target market. Isaiah processors use an out-of-order design, a faster front-side
bus, a twice as much cache, which could give the chips an edge over Silverthorne.
But an accurate comparison of the two chips won't be possible until they are
released and can be benchmarked by independent observers.

Even if Isaiah outperforms Silverthorne, Via must still compete with Intel
for orders and that may prove difficult.

Via is tiny by comparison to Intel and cannot offer the same level of support
to its customers in terms of marketing muscle. Via will also need to keep Isaiah's
price relatively low to be competitive with Silverthorne, which is the smallest
chip produced by Intel over the last 15 years or so.

"The 486 was a bit smaller," Rattner said.

The small size of Silverthorne means Intel can produce 2,500 chips on a single
300-millimeter silicon wafer. That keeps unit production costs low and will
allow Intel to sell Silverthorne at a relatively low price, as well. It also
means Intel can produce Silverthorne without diverting too many manufacturing
resources from its flagship Core 2 and Xeon products.

IDG News Service

• Email
• Print
• Share
  • Slashdot
  • Digg
  • Stumble
  • Reddit
  • Newsvine