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: XFX HD 7950 BLACK Edition 900MHz 3GB DDR5 2xMiniDP HDMI DVI PCI-E
Product description: Chipset: ATI Radeon HD7950
Product feature: Engine Clock: 900 MHz, Video Memory: 3GB DDR5, Memory Clock: 5.5 GHz, Memory Interface: 384-bit, Bus: PCI-Express 3.0 x16
Product brand: XFX
Target attributes: Manufacturer
Answer: attribute: manufacturer
value: xfx
source: product title
attribute: manufacturer
value: xfx
source: product brand