In Dec. 2005, I bought a new CPU for $389.  It was an AMD Athlon 64 X2, with dual 2.0GHz processors.  I also bought 1GB of RAM for $120.

In September 2008, I bought a new CPU.  It was an AMD Phenom II X4, with quad 3.0 GHz processors, for $190.  I also bought 8GB of RAM for $270.

Now I'm looking for a newer CPU and more RAM.  I can buy an AMD Phenom II X6, with six 3.2 GHz processors, for $170.  I can also buy 16GB of RAM for $100.

Dec. 2005 was 5 years and 10 months ago.  So we should have had 3 to 4 Moore doublings.  From .0333 GHz/$, that would take us to .266 to .533 GHz/$.  From 8.3 MB/$, we should have gone to 66.4 or 132.8 MB/$.

Instead, I am at 6x3.2 GHz/$170 = .113 GHz/$ and 160 MB/$.  CPU speed is lagging far behind Moore's Law, while RAM is outstripping it.

Both depend on transistor density.  So why are they so different?