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Home » CPU
IDF Fall 2005 Coverage
Author: Gabriel Torres
Type: Articles Last Updated: August 25, 2005
Page: 2 of 3
New Architecture

Intel’s CEO announced that Intel is migrating to a new microarchitecture. Nowadays Intel processors for desktop (Celeron and Pentium 4) and servers (Xeon) are based on Netburst microarchitecture, which is Intel’s 7th generation architecture. When it was launched hardware experts heavily criticized this microarchitecture. In fact, a Pentium 4 was slower than a Pentium III running at the same clock. Some Intel clients even sued Intel because of this, since Intel was selling a new product as being ”superior“ but in fact it was slower than the product from previous generation.

Technically speaking, the main problem with Netburst architecture is the time an instruction takes to be executed. The internal architecture of the very first Pentium 4 had a 20-stage pipeline, while the internal architecture of the Pentium III had 10 stages. Thus, on Pentium 4 one instruction to be executed need to pass through 20 stages (or ”circuits“, as so to speak), while on Pentium III this same instruction passed through only 10 stages. Conclusion: taking only this idea into account, a Pentium III is twice faster than a Pentium 4. More recent models of Pentium 4 have even more stages.

However, other details must be taken into account. With 20 stages Pentium 4 can have up to 20 instructions being executed at the same time, while Pentium III can have only 10, what in theory would compensate the whole issue we are talking about. Also, with more stages higher clocks can be achieved. This occurs because with more stages each stage can have fewer transistors, and the fewer transistors per stage a processor has, the easier it is to achieve higher clocks.

The higher clocks achieved by Pentium 4 compensated this Netburst architecture drawback we are talking about. Since now Intel is not focusing in achieving only higher clocks, but on the ”performance per watt“ concept, Intel engineers started to think in changing Intel processors microarchitecture for the next generation of Intel CPUs.

Pentium M, the CPU used on Centrino platform, is based on Pentium III and not on Pentium 4, offering a performance higher than a Pentium 4 running at the same clock – besides clearly heading to the ”performance per watt“ direction, since it is a processor originally targeted to the mobile market segment, where performance, power consumption and heat dissipation are part of a very hard to solve equation.

Thus Intel decided that its new CPU architecture will be based on Pentium M microarchitecture and not on Pentium 4’s. Intel announced three processors using this new architecture: Woodcrest, for the server market segment, Conroe, for the desktop market segment, and Merom, for the mobile market segment. These are obviously codenames, as Intel didn’t disclosure what the commercial names would be or launch dates. However, all these processors will have at least the following technologies:

  • 64-bit extensions (EM64T)
  • Virtualization technology (VT)
  • LaGrande security technology (LT)
  • Active management technology (AMT)
  • Dual-core
  • 65 nm manufacturing process
  • Hyper-Threading technology on the server model (Woodcrest)

Merom
click to enlarge
Figure 4: Merom processor prototype.

Otellini also announced that Intel will launch two single core CPUs based on Netburst architecture using the 65 nm manufacturing process and that Intel wants to sell 6 million dual-core processors from now to the end of 2006.

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