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1 CHAPTER -1 INTRODUCTION AMD is unveiling today the new processor architecture that will be used in their new CPUs starting in 2011. Codenamed Bulldozer, this architecture is completely different from the current AMD64 architecture that AMD has been using since the introduction of the very first Athlon 64 CPU back in 2003. Bulldozer will be the first major redesign of AMD’s processor architecture since 2003, when the firm launched its Athlon 64/ Opteron (K8) processors, and will feature two 128-bit FMA-capable FPUswhich can be combined into one 256-bit FPU. This design is accompanied by two integer cores each with 4 pipelines (the fetch/decode stage is shared). Bulldozer will also introduce shared L2 cache in the new architecture. AMD calls this design a "Bulldozer module". A 16-core processor design would feature eight of these modules, but the operating system will recognize each module as two physical cores. The module, described as two cores, can be compared to a single Intel core with HyperThreading. The difference between the two approaches is that Bulldozer provides dedicated schedulers and integer units for each thread, whereas in Intel's core each thread can access all available resources, except for the individual thread state information. The Bulldozer architecture will inherit some features introduced with the AMD64 architecture, such as the integrated memory controller and the use of the Hyper Transport bus for communication between the CPU and the chipset. Bulldozer is the codename for the architecture, not for a specific processor. AMD has proposed the first desktop CPUs based on the Bulldozer architecture will require a new CPU socket, called AM3+, which will also be compatible with current socket AM3 processors. Socket AM3+ CPUs, however, won’t be compatible with socket AM3 motherboards.

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