Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Intel Pentium D 940 LGA 775 CPU - 3.2GHz, 2MB Cache CPU Processor
Product description: Intel Pentium D 940 3.2GHz Processor - 3.2GHz - 800MHz FSB - 4MB L2 - Socket T LGA-775
Product feature: Frequency (MHz): 3200, Bus speed (MHz): 800, Socket: LGA775, Level 2 cache size: 4MB
Product price: $5.22
Product brand: Intel
Target attributes: FSB Speed
Answer: attribute: fsb speed
value: 800mhz fsb
source: product description