what are different between PPRO-S and PPRO. also MMX-S and MMX. I saw it in some machine while boot.

I believe you saw some BIOS remark.

The various flavors of the P Pro come in different speeds,
150 to 200 Mhz and three different internal caches 256, 512 or even 1MB. (200Mhz only for 1MB cache)

P Pros have NO MMX. That is the PII series, which is electrically identical to the PPros.   If fact, Tyan makes riser cards so if you buy a PII dual motherboard, (for the faster SDSIMM) you can put the riser card in and use the P-pros so you can have the full speed cache.... (but no MMX) MMX would have no benfit to a server, which is where the P pros are usually used....

As for the -S maybe you we're looking at a system that can have multiple Pro processors? and it only had a Single cpu in it

no, I also saw MMX-S too ( on single cpu board )
I think it is new-improvement.

Interesting.... I checked my system by yanking one of the Processors, then put the second one back in.... In both cases is displays a -S

I have never used the ones with more than 256K cache.....

'-S' means CPU has 'SL ADVANCED POWER MANAGEMENT'

sorry i didn't see your answer becoz effect of proxy server.
i hate proxy server.

thank you for your answer/.

have any comment ?

:P

S mean SL advance power manager....that all i need.

proxy didn't reload so i didn't see MATTCEI's answer...