Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: Dell Alienware X51 R2 AX51R2-17153BK Desktop (3.40 GHz Intel Core i7-4770 Processor, 16 GB RAM, 256 GB SSD + 1TB HDD, NVIDIA GeForce GTX 760 Ti, Windows 8.1 64-bit)
Product description: DELL Alienware X51 R2 Desktop Computer - Intel Core i7 i7-4770 3.40 GHz - Matte Stealth Black, Dark Chrome Accent- 16 GB RAM - 1 TB HDD - 256 GB SSD - DVD-Writer - NVIDIA GeForce GTX 760 Ti - 2 GB Graphics - Windows 8.1 64-bit (English) - Wireless LAN - B AX51R2-17153BK
Product feature: Intel Core i7-4770 processor (8M Cache, up to 3.9 GHz), 8GB Dual Channel DDR3 1600Mhz, 256GB SSD + 1TB SATA (5,400RPM), NVIDIA GeForce GTX 760 Ti with 2GB GDDR5, Windows 8.1 (64-Bit)
Product brand: Alienware
Target attributes: Graphics Processor
Answer: attribute: graphics processor
value: geforce
source: product feature
attribute: graphics processor
value: nvidia
source: product feature
attribute: graphics processor
value: geforce
source: product title
attribute: graphics processor
value: geforce
source: product description