Both models
B980 and
G645 are based on
Sandy Bridge architecture.
"Sandy Bridge codename was originally ""Gesher"". The development began in 2005 and four years later, the first Sandy Bridge CPU was presented. The most prominent features are Intel Turbo Boost 2.0, AES encryption and SHA-1 hashing acceleration, Advanced Vector Extensions (AVX) 256-bit instruction set and the ability to have up to 8 physical cores or 16 logical cores through Hyper-Threading."
Using the multithread performance as a reference, the B980 gets a score of
31.8 k points while the G645 gets
35.4 k points.
Summarizing, the
G645 is
1.1 times faster than the
B980. To get a proper comparison between both models, take a look to the data shown below.