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Why does super pi compute so slow on AMD?

post #1 of 4
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Title says it all. Intel processors can get under 7 minutes to calculate pi while AMD is around 20 minutes. I was just wondering why this was.
Ol' No Name
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Ol' No Name
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post #2 of 4
Two main reasons:

1) Superpi uses an old floating point instruction set called x87. It was superceded by SSE and 3Dnow! and has been deprecated for around 10 years.

2) SP is only a single-threaded program and Bulldozer/Piledriver's power is only truly unleashed in multithreaded applications.
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post #3 of 4
My FX 6300 (stock) does SuperPI 1M in 25.382sec. That not overly slow.
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Monster HAF
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post #4 of 4
Intel & AMD are just different, for higher bench scores intel is the way to go, for an 8 core cpu that won't break the bank AMD is nice. They're all fun to play with, just have more time for beer with AMD in pi 32m biggrin.gif.
It may seem slow in superpi but not like you really see a difference doing daily stuff.
    
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