Areca ARC-1231ML/1261ML/1280ML User Manual

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Answer: 

Yes, in most cases. Even though the hardware microarchitecture 

for each company’s processor is different, the operating system 

and software ported to one processor will likely run on the other 

processor due to the close similarity of the instruction set architec-

tures. However, Intel processors support additional features, like 

the SSE3 instructions and Hyper-Threading Technology, which are 

not supported on non-Intel platforms. As such, we believe devel-

opers will achieve maximum performance and stability by design-

ing specifically for Intel architectures and by taking advantage of 

Intel’s breadth of software tools and enabling services. 

Answer: 

Platforms with Intel® EM64T/AMD64 can be run in three basic 

ways (note: a 64-bit capable BIOS is required for all three scenari-

os): 

1. 32-bit O/S and 32-bit applications (Legacy Mode): No software

    changes are required, however the user gets no benefit from 

    Intel® EM64T or AMD64. 

2. 64-bit O/S and 32-bit applications (Compatibility Mode): This 

    usage requires all 64-bit device drivers. In this mode, the O/S 

    will see the 64-bit extensions, but the 32-bit application will 

    not. Existing 32-bit applications do not need to be recompiled, 

    and may or may not benefit from the 64-bit extensions. The 

    application will likely need to be recertified by the vendor to 

    run on the new 64-bit extended O/S. 

3. 64-bit O/S and 64-bit applications (64-bit Mode): This usage 

    requires 64-bit device drivers. It also requires applications to 

    be modified for 64-bit operation and then recompiled and vali-  

    dated.