Bo, you will be able to find information on Sandy Bridge processors on these links:
http://www.intel.com/content/www/us/en/processors/core/2nd-gen-core-desktop-vol-1-datasheet.html
http://www.intel.com/content/www/us/en/processors/core/2nd-gen-core-desktop-vol-2-datasheet.html
2nd Gen Intel® Core™ Processor, LGA1155 Socket: Thermal Guide