Floating point speed

Graham
Graham
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Topic 190373

I appreciate the help from the CPU Heat topic, and as I watched the temp go upwards my fan kicked on and cooled it down, but anyways why is it that I have a higher floating point speed than a P4 2.4GHz, while I only run a single 1.6GHz chip?

Bill Michael
Bill Michael
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Floating point speed

What are you comparing? Benchmark scores? What two machines? If benchmarks, what versions of BOINC? One optimized and one not? Both CPUs under your control where you can rerun tests?

Graham
Graham
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Benchmark scores, one cpu,

Benchmark scores, one cpu, the latest download of BOINC.

Jord
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Are you comparing an Intel P4

Are you comparing an Intel P4 with an AMD chip, perhaps?

Graham
Graham
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Yes Intel to AMD...

Yes Intel to AMD...

Bill Michael
Bill Michael
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RE: Benchmark scores, one

Message 21442 in response to message 21439

Quote:
Benchmark scores, one cpu, the latest download of BOINC.

Reread my questions. What are you comparing it TO? Give host ID#'s, something... can't answer "why" if we can't see the data...

Graham
Graham
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Okay, bear with me, I just

Okay, bear with me, I just looked at your Athlon 3200, it has a Float speed of 2500+million ops a sec, mine is less than that, but when I look at other computers' benchmark scores I see lower numbers for Intel P4s running higher than 1.6GHz...Get me?

Mike Hewson
Mike Hewson
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RE: Okay, bear with me, I

Message 21444 in response to message 21443

Quote:
Okay, bear with me, I just looked at your Athlon 3200, it has a Float speed of 2500+million ops a sec, mine is less than that, but when I look at other computers' benchmark scores I see lower numbers for Intel P4s running higher than 1.6GHz...Get me?

If you're comparing to hyperthreading ( basically one processor behaving like two ) P4's then the benchmark will refer to each 'virtual' CPU - multiply by two to compare.

I have made this letter longer than usual because I lack the time to make it shorter. Blaise Pascal

Michael Roycraft
Michael Roycraft
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Keith, PREFACE: I'm not

Keith,

PREFACE: I'm not trying to start an Intel vs AMD war here, just offering a general explanation.

Different CPU architectures handle arithmetic operations differently. AMDs in general are more "efficient" (do more arithmetic per clock cycle) than Intels. Intels generally are able to clock faster than AMDs.

Intel procs are stronger at integer than at floatingpoint calcs, but by a factor of maybe 1.3/1. AMD procs also are able to process more integer than floatingpoint calcs, but the factor in favor of integer is more like 1.7/1.

microcraft
"The arc of history is long, but it bends toward justice" - MLK

Paul D. Buck
Paul D. Buck
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Plus, the benchmark scores

Plus, the benchmark scores are essentially meaningless except for the mis-calculation of credit and the comparison of "mine is bigger" ... :)

tullio
tullio
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RE: Keith, PREFACE: I'm

Message 21447 in response to message 21445

Quote:

Keith,

PREFACE: I'm not trying to start an Intel vs AMD war here, just offering a general explanation.

Different CPU architectures handle arithmetic operations differently. AMDs in general are more "efficient" (do more arithmetic per clock cycle) than Intels. Intels generally are able to clock faster than AMDs.

Intel procs are stronger at integer than at floatingpoint calcs, but by a factor of maybe 1.3/1. AMD procs also are able to process more integer than floatingpoint calcs, but the factor in favor of integer is more like 1.7/1.


Well, on my Pentium II at 400 MHz the integer/floating point ratio is 1.76.
Tullio

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