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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Sloxa on May 09, 2003, 09:27:51 AM

Title: ppc 603e+ mips...
Post by: Sloxa on May 09, 2003, 09:27:51 AM

i have strange problem....  
my bppc shows 245mips and after overclock to
233 it shows 287mips...   and  now i chache some
memory settings and patch!!  sysspeed shows
at 513mips and 262mflops !!!!!!   how that can be???
is that possible or is my syspeed program confused!!
 :-o        :-)  
i like know what is the real mips number!!
how match is mips in 210mhz or 240mhz??

Title: Re: ppc 603e+ mips...
Post by: Karlos on May 11, 2003, 03:24:40 PM

I dunno how likely that is but it's not impossible under the right circumstances. The 603e can have up to five instruction in execution at once and retire up to three of them per cycle under perfect circumstances.
So you could, in theory, get 3x your clockspeed operations/sec. But not in reality...

However, most ordinary code has on average 1-2 instructions per cycle so for a 240MHz (mine) 295 MIPS / 180 MFLOPS.

More likely I'd say the benchmarker is a bit confused. Maybe it doesn't have the correct clock speed?

Title: Re: ppc 603e+ mips...
Post by: downix on May 11, 2003, 05:52:05 PM

It is more than possible to have a setting to achieve this, depending
on your cache and configuration settings.

Pity MIPS is a worthless measurement of performance.

Title: Re: ppc 603e+ mips...
Post by: Karlos on May 11, 2003, 06:07:17 PM

Quote

downix wrote:
It is more than possible to have a setting to achieve this, depending
on your cache and configuration settings.

Pity MIPS is a worthless measurement of performance.

Fire away :-) What tweaks do you sugesst? I wouldn't mind getting 500MIPS for the sake of a bit of twiddling some settings even if only to delude myslef my machine is faster than I thought :lol:

Title: Re: ppc 603e+ mips...
Post by: downix on May 11, 2003, 09:45:14 PM

Measure out the side of the MIPS benchmarking program, compare it to
your L1 cache size, then make sure that much space is free in your L1
cache for the program to measure by.

Easiest way to boost MIPS performance I know of.

Title: Re: ppc 603e+ mips...
Post by: carls on May 11, 2003, 11:31:46 PM

How does a 603e/604e compare to a Pentium II at the same clock speed?

Title: Re: ppc 603e+ mips...
Post by: Hammer on May 12, 2003, 01:29:50 AM

Quote

carls wrote:
How does a 603e/604e compare to a Pentium II at the same clock speed?

Some past Pentium II vs PowerPC G3 benchmarks refer to
http://www.studio201.com/cwu/editorials/g3_vs_p2.html