|You must be talking about the 5200+ on the 90nm Windsor Core that uses 1mb L2 cache per core, because the 5200+ on the Brisbane Core uses 512kb L2 Cache per core.|
The Athlon II X2 215 is faster then the Athlon 64 X2 5200+ on the Windsor Core.
CPU Mark Score
Athlon II X2 215
Athlon 64 X2 5200+ Windsor
^ I don't know why the link to the Athlon 64 X2 5200+ isn't working but you can scroll down from the Athlon II X2 215 chart on its link to see the Athlon 64 X2 5200+ score.
Iron Sharpens Iron.