Henk Slager wrote:
.... I am new to this list & have a question about AMD64 hardware. An Intel P3/P4 processor requires 2 clock ticks to complete 1 32-bit floating point add or multiply, more for subtraction & division, more for 64-bit (I think); An SGI R10K/R12K/R14K can do 1 F.P. add & 1 F.P. mult (32 bit or 64 bit) in 1 clock tick, more for subtraction & division. What are the equivalent stats for AMD64 CPUs ? Thanks in advance. This is an interesting question but the answer is far from simple. The figures you mention are important for actual (math) processing speed, but things like
On Friday 19 March 2004 14:28, William A. Mahaffey III wrote: pipelining, caching and memory accessspeed are probably even more important nowadays. And not to forget the hardware/register based parallelism like MMX/ SSE. If you really want to know every detail, you have to work on a commercially interesting project in order to be allowed to sign an NDA with AMD .... In the meantime have a look at:
http://www.cpuid.com/K8/index.php
/Henk
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Interesting. I understand the necessity for good code & compilers to achieve speed-of-light performance, I was just asking what the speed-of-light is under AMD64, i.e. are they just a 64-bit version of P3/P4 (2 ticks / FPop) or more like SGI ?