Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Sapphire Radeon VAPOR-X R9 280X 3GB GDDR5 DVI-I/DVI-D/HDMI/DP OC Version (UEFI) PCI-Express Graphics Card 11221-02-40G
Product description: Sapphire Radeon VAPOR-X R9 280X 3GB GDDR5 DVI-I/DVI-D/HDMI/DP OC version (UEFI) PCI-Express Graphics Card
Product feature: 384-bit GDDR5, 1 x DVI-I, 1 x DVI-D, 1 x HDMI, 1 x DisplayPort
Product brand: Sapphire Technology
Target attributes: Interface
Answer: attribute: interface
value: pci-express
source: product title
attribute: interface
value: pci-express
source: product description