quick DDR2 question

Ok, thanks.
And question 2:

The Tom's Hardware CPU benchmarks show a RAM spec under each CPU, such as:
AMD Phenom II X4 955 (Deneb 4c) * 3.2 GHz, DDR3-1333, 2 MB L2, 6 MB L3

...Does that mean the CPUs are best coupled with that type of RAM, or that's just what they tested with? (I wouldn't normally think the latter, because it's mixed in there with the CPU's specs)
 
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