>From AMD's suit against Intel. Perhaps relevant to some PG/AMD issues. 

"...125. Intel has designed its compiler purposely to degrade performance when 
a program
is run on an AMD platform. To achieve this, Intel designed the compiler to 
compile code
along several alternate code paths. Some paths are executed when the program 
runs on an Intel
platform and others are executed when the program is operated on a computer 
with an AMD
microprocessor. (The choice of code path is determined when the program is 
started, using a
feature known as "CPUID" which identifies the computer's microprocessor.) By 
design, the
code paths were not created equally. If the program detects a "Genuine Intel" 
it executes a fully optimized code path and operates with the maximum 
efficiency. However,
if the program detects an "Authentic AMD" microprocessor, it executes a 
different code path
that will degrade the program's performance or cause it to crash..."

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