Just my 2 cents
My 2.0 celeron 128k is = too my 1.3 celeron 256k
counting 2.0 has pc2100 - 1.3 has pc133
I tested a p4 2.4 but it used pc133 and that slowed it
2.2 celeron 128k with pc2100 = too P4 2.4 512k with pc133
<font color=blue>HOSED = Horrific operating system error detected</font color=blue>
OUCH. yes. sdram will hold your system back.. especially with a p4's architecture.
I noticed with AMD systems that 133mhz sdram was did hinder performance of UD.
150Mhz sdram gave moderate performance boost.
Interestingly when i changed to a efficient DDR system (KT333) the performance benifits of upping the ram stopped.
E.G. 133/133 gave just as much performance as 133/166 or 166/166. Memory bandwidth was completly satisfied with 133mhz DDR, the rate determining step being CPU power.