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: ASUS R9390X-DC2-8GD5 Graphics Card
Product description: ASUS Introduces the R9390X-DC2-8GD5 Graphics Card
Product feature: DirectCU II thermal design, DIGI+ VRM power design with Super alloy Power technology offering ample overclocking headroom, GPU TWEAK II makes overclocking easier than ever, and features Gaming Booster to maximize system performance, Customized ASUS GPU Tweak II x XSplit Gamecaster utility lets you easily tweak, stream and record your greatest gaming moments at the click of a button, Free 1-year premium license unleashing the full potential of the utility!
Product brand: Asus
Target attributes: Slot Size
Answer: attribute: slot size
value: None
source: None