Resolved Information required for overclocked DDR3

The motherboard on my second PC died the other night so I bought a new one with -
socket lga775
1333/1066/800 MHz FSB
Support for DDR3 1333(O.C.)1066/800 MHz memory modules

It has a core 2 Duo Pentium 3Mb fsb 1333 and
2GB DDR3 1333 ram installed but the BIOS shows it at 1066. I guess that is because the specs show that 1333 ram is supported but O.C.

I ran benchmark tests with the ram at 1066

I then 'overclocked' the ram to 1333 (in the BIOS by the 'multiplyer') and then BIOS shows it as 1333.

I ran the benchmark tests again and the various arithmetic tests actually came up a smidgen UNDER the same results when the ram was at 1066.

I guess that the CPU affects the arithmetic tests and not the ram speed. So what does ram speed affect?
Where would I see it as an improvement?

Do I assume correctly that if the CPU is fsb 1333 then it is best to also have ram at 1333?

I'm just wondering if I should continue to overclock the RAM (the m/b specs say that 1333 ram is supported O.C. (overclocked)

 

Maybe this would help :

Beginners Guides: Overclocking the CPU, Motherboard and Memory

 

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I am VERY sorry
I have been unwell and not bothered with the internet until now. I have been regularly closing posts in the past and that is the reason why I have not closed this one.

 

No problems. Just a gentle reminder.