Mixing memory didn't drop benchmark much

This is a discussion about Mixing memory didn't drop benchmark much in the Windows Hardware category; On a 100MHz memory bus (AMD 751 chipset) mixing one PC133 and two PC66 (?) strips only dropped the benchmark 5% running SiSoft Sandra 2004. I'm not sure about these other 2 strips (32MB each) of memory.

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On a 100MHz memory bus (AMD 751 chipset) mixing one PC133 and two PC66 (?) strips only dropped the benchmark 5% running SiSoft Sandra 2004.
 
I'm not sure about these other 2 strips (32MB each) of memory. The date on the chips is 1998. Can I assume it is PC66? I'm just surprised the hit was less than 5% vs. testing only the PC133 strip (128MB) by itself.
 
It went from 660MB/sec down to 630MB/sec when the additional strips were added.
 
Input? Am I correct about the '98 chips being PC66?

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Probably not, but you can check that with sandra.
Go to Mainboard Information and scrool down to somethink like this
 
Memory Module(s)
Memory Module 1 : 128MB 16x(8Mx8) SDRAM PC133U-333-542 (CL3 upto 133MHz)
Memory Module 2 : AMD 128MB 16x(8Mx8) SDRAM PC133U-333-542 (CL3 upto 133MHz)
Memory Module 3 : 256MB 8x(32Mx8) SDRAM PC133U-333-542 (CL3 upto 133MHz)
 
 
you can see all the modules in my system are PC133.

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OP
I returned the box to the owner since it was up tp par. I was just wondering about the lack of a hit with the older memory.
I know since the bus isn't a 133 the difference wouldn't be that great, but was surprised to see the little difference.
Since there WAS a hit, is it ok to assume that the older memory isn't PC100? If it was PC100 there shouldn't be a 'hit' at all mixing it with the other stick (even though it was 'better' memory?