Amd64 Single Socket Processor Architecture; Table 1. Memory Bandwidth - AMD 3800 - Processor - 1 x Athlon 64 Evaluation Manual

30579 Rev. 3.74 March 2007

AMD64 Single Socket Processor Architecture

Detailed knowledge of AMD 64-bit processor architecture is not required to perform
optimal benchmarking. However, the benchmarks demonstrate the advantages of
key architectural features. This overview provides information about those features
and shows how the benchmarks demonstrate the exceptional performance of AMD
processors.
AMD 64-bit processors include the following architectural improvements specifically
designed to increase the number of instructions per clock (IPC).
• AMD64 Technology
When the AMD64 Instruction Set Architecture is utilized, 64-bit mode offers:
– Support for 64-bit operating systems that provide full, transparent, and
simultaneous 32-bit and 64-bit platform application multitasking.
– A physical address space that supports up to 1 TB of installed RAM, shattering the
4 GB RAM barrier on current x86 systems.
– Sixteen 64-bit general-purpose integer registers, four times as much general-
purpose register space for applications and device drivers as traditional x86
architectures.
– Sixteen 128-bit XMM registers for enhanced multimedia performance, double the
register space of current SSE/SSE2/SSE3 implementations.
• An integrated DDR2 memory controller (see
– The integrated controller reduces memory latency and increases overall system
performance.
– When comparing platforms with different types of memory, test memory bandwidth
and latency first. The results help to clarify the sometimes surprising results of
more complex, application-based benchmarks.
Memory is marked/marketed on bandwidth. As
DDR2-800 memory can provide up to 35% more bandwidth than DDR1-400.
Sciencemark 2.0
Bandwidth (MB/s)
Sciencemark 2.0
Latency (ns)

Table 1. Memory Bandwidth

AMD Athlon™ 64 FX-62
Dual-Core Processor,
DDR2-800
6779.3
46.5
AMD64 Single Socket Processor Architecture
AMD Processor Performance Evaluation Guide
Figure 1).
Table 1 shows, during tests,
AMD Athlon 64 FX-60
Processor, DDR1-400
4472.6
52.5
13