What are the relative advantages and disadvantages of two pairs of sticks 
given that they both cost the same? 
Basically, why one might prefer:
CT2KIT12864AA667 • DDR2 PC2-5300 • CL=5 • Unbuffered • NON-ECC • DDR2-667 • 
1.8V • 128Meg x 64  
to:
CT2KIT12864AA800 • DDR2 PC2-6400 • CL=6 • Unbuffered • NON-ECC • DDR2-800 • 
1.8V • 128Meg x 64
or vice versa.
http://www.crucial.com/uk/store/listparts.aspx?model=K8M890M2MB-RS2H&pl=FOXCONN&cat=RAM
(the first two pairs of sticks)
The processor is an AMD Athlon 64 3500+.
TIA
Lisi