Sun Microsystems, Inc.
•512 MB to 2 GB low profile (1.2 inch/3.05 cm) DIMM support
•Up to 32 GB per CPU in with 4 GB DIMMs in 8 DIMM slots per CPU
•Single supply (2.50 VDC)
•Standard SPD (VCC-SPD=3.3V)
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 infrastructure. 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 continued 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 data sets 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 computing, including many high-performance computing (HPC) cluster applications
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