from System Information
Model Name: MacBook Pro
Model Identifier: MacBookPro8,2
Processor Name: Intel Core i7
Processor Speed: 2.2 GHz
Number of Processors: 1
Total Number of Cores: 4
L2 Cache (per Core): 256 KB
L3 Cache: 6 MB
Memory: 4 GB
Boot ROM Version: MBP81.0047.B27
SMC Version (system): 1.69f4
Sudden Motion Sensor:
State: Enabled
https://support.apple.com/kb/SP644
http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.2-15-late-2011-unibody-thunderbolt-specs.html
This model does not support "Snow Leopard" (10.6)
http://www.everymac.com/systems/apple/macbook_pro/macbook-pro-unibody-faq/macbook-pro-13-15-17-mid-2009-how-to-upgrade-ram-memory.html