Pentium 200 256K and 200 512K on same board

Pentium 200 256K and 200 512K on same board

Post by J. de Brui » Sat, 19 Oct 1996 04:00:00

Will a P6-200 256K cache CPU work in the same dual motherboard (in my
case a Supermicro P6-DNE), as a P6-200 512K cache CPU, or do the caches
on both chips have to be the same size?



1. Pentium Pro 200 Mhz faster than Sparc Ultra 200 Mhz !! ??


I've found the following numbers in a benchmark table published in this newsgroup:

                                SPECint SPECfp          SPECint SPECfp
                                base95  base95           95      95

Pro 200 Mhz, 256 K cache        8.7    5.9 - 6.5        8.7     6.2 - 6.7
SUN Ultra 200 Mhz               6.4    11.6             7.7    11.1 - 14.7

In summary, the Sparc Ultra should be approximately two times faster than a
Pentium Pro at 200 Mhz for floating point calculations.

Yesterday I did a test with a real-world C-programm, that means no "artificial bench",
doing plenty of floating point multiplications (neural network research). I tried to
write "good" C-code, that means to use pointers with post-increments whenever possible.

Surprisingly the Pentium was almost 30 % faster than the Sparc ULTRA !!
How is this possible ??

I compiled using gcc 2.7.2 on both machines with the following optimisations:

  -O9 -funroll-loops -finline -fomit-frame-pointer -fstrength-reduce -ffast-math -fPIC

and additionally: -m486 on the PentiumPro and -msupersparc on the SUN.

The PentiumPro runs Linux 2.0.28 and the SUN Solaris 2.5 (the SUN is an ULTRA-2, but
the programm uses only one CPU).

This question is of interest for us since we want to buy a new machine ...

Thanks for any hints


P.S. the result is the same for SUNs compiler  SC4.0 18 Oct 1995 C 4.0

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