If it's the late 2012 version (with geforce 640), then its probably the i5-3330S.
http://ark.intel.com/products/65509/Intel-Core-i5-3330-Processor-6M-Cache-up-to-3_20-GHz
2011 version has the i5-2500S with Radeon 6770
http://ark.intel.com/products/52211/Intel-Core-i5-2500S-Processor-6M-Cache-up-to-3_70-GHz
http://ark.intel.com/products/65509/Intel-Core-i5-3330-Processor-6M-Cache-up-to-3_20-GHz
2011 version has the i5-2500S with Radeon 6770
http://ark.intel.com/products/52211/Intel-Core-i5-2500S-Processor-6M-Cache-up-to-3_70-GHz
Desktop HTPC:
Gigabyte Z97X-Gaming5- i7-4790k MSI-B75-E33, i5-2500k
Corsair Vengeance 16GB RAM Crucial 8GB RAM
Gigabyte GTX780 GHz Edt. ASUS GTX960 Strix
Win 10 Pro / OS X 10.10 Win 10 Pro
Gigabyte Z97X-Gaming5- i7-4790k MSI-B75-E33, i5-2500k
Corsair Vengeance 16GB RAM Crucial 8GB RAM
Gigabyte GTX780 GHz Edt. ASUS GTX960 Strix
Win 10 Pro / OS X 10.10 Win 10 Pro
