Tim, you're such stupid fanboi. Are you a lawyer working for rambus?
You use the word "outperform" but you're only using the memory bandwidth to compare performance, you don't mention that RDRAM had/has a huge latency disadvantage. That's like comparing sports car using top speed as your only criteria.
Let's take a trip down memory lane and look at some benchmark from when RDRAM was introduced to see why it tanked:
http://www.anandtech.com/showdoc.aspx?i=1245&p=13 .
What's so hard to understand that Rambus are shady because they kept their patents secrets, got the IP into the standard, then started suing everyone?
http://en.wikipedia.org/wiki/Submarine_patent