You should check to see which version of the cpu you got. The original 3400+ was a 2.2 ghz chip with 1mb of L2 cache. But according to amd's website the 3400+ is now spec'ed at 2.4 ghz with 512kb of L2 (single channel memory bus)
www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9487^10248,00.html
www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9487^10248,00.html