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: ASUS G60VX GAMING NOTEBOOK
Product description: The ASUS G60Vx is a powerful gaming notebook, with the latest NVIDIA GeForce GTX260M with 1GB GDDR3 VRAM for an immersive gaming experience. Gamers are also armed with a backlit gaming keyboard that enables them to conquer their enemies even in the dark, and industry leading EAX Advance HD 3D gaming audio effects Display - 16" HD (1366x768) LED backlit,Color-Shine (Glare-type) NVIDIA GeForce GTX 260M with 1GB GDDR3 VRAM Hard Drive Dual HDD: 2.5" 9.5mm SATA 1 TB(500GBx2),5400rpm 640GB(320GBx2),7200rpm Dual HDD support
Product feature: ASUS G60VX GAMING NOTEBOOK - VERY GOOD CONDITION, WINDOWS 7, INTEL CENTRINO 2, NVIDIA GEFORCE
Product brand: Asus
Target attributes: Number of Cores
Answer: attribute: number of cores
value: None
source: None