Ознакомительное Руководство для HP DL585 - ProLiant - G2

 

Operating modes 
AMD Opteron processors use three different operating modes: 64-bit long mode, 64-bit 
compatibility mode, and 32-bit legacy mode. The 64-bit long mode requires a 64-bit OS and an 

application recompiled to use the 64-bit registers. In other words, the full capabilities of the 

expanded register set are available only when both the OS and the application support 64 bits. 

The 64-bit compatibility mode requires a 64-bit OS, but can use a 32-bit application. The 
additional registers are available to the OS, but not to the 32-bit application, because it cannot 

make use of them. When running in legacy mode, the processor acts just like a 32-bit processor, 

and the extra registers are not available (Table 2). 

Table 2. Operating modes for AMD Opteron processors

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Mode OS 

required 

Application 
recompile required?  

Register extensions 
available?  

GPR width 
(bits) 

64-bit long mode 

64-bit OS 

Yes 

Yes 

64 

64-bit compatibility 
mode 

64-bit OS 

No 

Yes – to OS 
No – to application 

32 

32-bit legacy mode 

32-bit OS 

No 

No 

32 

 
Memory addressability 
The AMD Opteron registers are at least 64-bits wide. When operating in 64-bit long mode, the 
AMD Opteron processors support up to 48 bits (256 Terabytes) for physical memory and use 64 

bits for virtual memory 

Naming conventions 

First-generation single-core AMD Opteron processors (Socket 940 and Socket 939) have three-digit 

model numbers in the form XZZ, and third-generation Quad-Core AMD Opteron processors (Socket 

F and Socket AM2) have four-digit model numbers XYZZ. AMD Opteron processor “generations” 

are called Revisions.  
For all AMD Opteron processors, the first digit “X” specifies the number of CPUs on the target 

machine: 

• 1000 Series - Single-processor systems  
• 2000 Series - Dual-processor systems  
• 8000 Series - Systems with up to 8 processors 

The second digit, Y, indicates socket generation, where “2” indicates Socket AM2 or Socket F 

(1207). Series 12ZZ processors are based on Socket AM2; Series 22ZZ and 82ZZ processors are 

based on Socket F (1207). If the second digit is “3,” it stands for third-generation AMD Opteron 
processors for Socket AM2 and Socket F (1207). If the second digit is “4,” it indicates Six-Core 

AMD Opteron processors. 

                                                 

2

 From the document titled “AMD64 Architecture Programmer’s Manual, Vol. 1: Application Programming,“ 

available at 

www.amd.com/us-en/assets/content_type/white_papers_and_tech_docs/24592.pdf

 

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