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 OptiPlex 990 SFF Core i7 3.40GHz 4GB WINDOWS 7 PRO 64-Bit HD5450 DVD-ROM
Product description: Dell OptiPlex 990 SFF Core i7 3.40GHz 4GB 500GB HD WINDOWS 7 PRO 64-Bit HD5450 DVD-ROM
Product feature: Processor: Intel Core i7-2600 3.40GHz; 4 Cores. 8 Threads; 8MB L3 Cache; Memory: 4GB DDR3 Installed; Hard Drive: 500GB, Operating System: Windows 7 Professional 64-Bit Installed with Recovery Partition and Certificate Of Authenticity; Optical Storage: DVD-ROM; Power Supply: 240 Watt, Graphics: Integrated Intel HD Graphics Controller; Audio: Integrated HD Audio Controller; Communication: Integrated Gigabit Ethernet Controller, Front I/O Ports: 4 USB 2.0, 1 Headphone / Audio, 1 Microphone / Audio, Rear I/O Ports: 6 USB 2.0, 1 DisplayPort, 1 VGA, 1 Audio Out, 1 Audio In/Out, 1 Ethernet (RJ-45), 1 Serial, 2 PS/2
Product price: $293.15
Product brand: Dell
Target attributes: Processor Speed
Answer: attribute: processor speed
value: 3.40ghz
source: product description
attribute: processor speed
value: 3.40ghz
source: product feature
attribute: processor speed
value: 3.40ghz
source: product title