Datasheet

Sun Microsystems, Inc.
Other features of the Sun Fire X4100 M2 and X4200 M2 servers memory architecture include:
• Dedicated on-die 128-bit wide DDR2 memory controller
• Memory bandwidth up to 10.7 GB/sec. @ DDR2-667
• Under 80 ns latency
• Registered ECC DDR2-667 (PC2-5300) supported
• 1 GB to 4 GB low profile (1.2 inch/3.05 cm) DIMM support
• Up t0 16 GB per CPU in with 4 GB DIMMs in 4 DIMM slots per CPU
• Single supply (2.50 VDC)
• Standard SPD (VCC-SPD=3.3V)
Note: The 32-bit version of Red Hat Enterprise Linux 3.0 is not capable of using more than 4 GB of physical memory, even if more
than 4 GB is installed. This is a limitation of the default kernel, not the hardware.
x64 Architecture
The x64 architecture is an x86-compatible architecture that enables simultaneous 32-and 64-bit computing. It enables end users to
run their existing installed base of 32-bit applications and operating systems at peak performance, while providing a migration path
that is 64-bit capable. It is designed to enable 64-bit computing while remaining compatible with the vast x86 software infrastruc-
ture. x64 architecture represents a new class of computing, enabling a single architecture across 32- and 64-bit environments.
The x64 Instruction Set Architecture (ISA) extends the existing x86 ISA and natively executes 32-bit code with no emulation mode to
degrade performance. For 32-bit software that does not require immediate 64-bit implementations, x64 processor-based systems are
designed to provide full application performance while continuing to improve with x64 platform performance enhancements.
Many applications encounter architectural barriers that prevent efficient performance scaling. The x64 ISA is designed to allow con-
tinued performance scaling for applications that demand multiprocessor scalability, larger addressable memory, better multimedia
performance, or improvements in computational accuracy.
The x64 ISA has been designed for applications that:
• Need large memory addressing to handle datasets larger then 3 GB per process (financial and scientific modeling applications)
• Must manage a large number of concurrent users or application threads, such as large-scale, thin-client solutions, large
databases, data warehouse applications for solutions in customer relationship management (CRM), supply chain management
(SCM), enterprise resource planning (ERP), and digital rights management (DRM) systems
• Require real-time encryption and decryption for enhanced security, including e-commerce and protection of private or
classified data
• Require mathematical precision and floating-point performance, including modeling, simulation, statistics and financial
analysis, imaging/video/signal processing, physics, medical research, telecommunications, encryption, and compression
• Require large, high-power database performance, including decision support, searching and indexing, document and content
management, and voice recognition
• Require x86 compatibility or the economies of scale of x86 as well as the large memory addressing capabilities of 64-bit
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