600M Series Laptop Graphics Cards NVIDIA GeForce: GT 620M, GTX 680MX, etc.

GEFORCE GTX 680MX
GPU Architecture: Kepler
GPU Model: GK104
CUDA Cores: 1536
Base Clock speed (BOOST): 720 MHz
Memory: 2 Gb GDDR5 (256-bit)

GEFORCE GTX 680M
GPU Architecture: Kepler
GPU Model: GK104
CUDA Cores: 1344
Base Clock speed (BOOST): 720 MHz
Memory: 2 Gb GDDR5 (256-bit)

GEFORCE GTX 675MX
GPU Architecture: Kepler
GPU Model: GK104
CUDA Cores: 584
Base Clock speed (BOOST): 600 MHz
Memory: 2 Gb GDDR5 (256-bit)

GEFORCE GTX 675M
GPU Architecture: Fermi
GPU Model: GF114
CUDA Cores: 384
Base Clock speed (BOOST): 600 MHz
Memory: 2 Gb GDDR5 (256-bit)

GEFORCE GTX 670MX
GPU Architecture: Kepler
GPU Model: GK106
CUDA Cores: 960
Base Clock speed (BOOST): 600 MHz
Memory: 2 Gb GDDR5 (192-bit)

GEFORCE GTX 670M
GPU Architecture: Fermi 
GPU Model: GF114
CUDA Cores: 336 
Base Clock speed (BOOST): 600 MHz
Memory: 3 Gb GDDR5 (192-bit)

GEFORCE GTX 660M
GPU Architecture: Kepler
GPU Model: GK107
CUDA Cores: 384
Base Clock frequency (BOOST): 835 MHz
Memory: 2 Gb GDDR5 (128-bit)

GEFORCE GT 650M
GPU Architecture: Kepler
GPU Model: GK107
CUDA Cores: 384
Base Clock speed (BOOST): 850 MHz DDR3 / 735 MHz GDDR5
Memory: 2 Gb GDDR5/DDR3 (128-bit)

GEFORCE GT 645M
GPU Architecture: Kepler
GPU Model: GK107
CUDA Cores: 384
Base Clock speed (BOOST): 710 MHz
Memory: 2 Gb GDDR5/DDR3 (128-bit)

GEFORCE GT 640M
GPU Architecture: Kepler
GPU Model: GK107
CUDA Cores: 384
Base Clock frequency (BOOST): 625 MHz
Memory: 2 Gb GDDR5/DDR3 (128-bit)

GEFORCE GT 635M
GPU Architecture: Fermi
GPU Model: GF108 or GF116
CUDA Cores: 384
Base Clock speed (BOOST): 675 MHz (753 MHz)
Memory: 2 Gb GDDR5/DDR3 (128/192-bit)

GEFORCE GT 630M
GPU Architecture: Fermi
GPU Model: GF108 or GF116
CUDA Cores: 384
Base Clock speed (BOOST): 900 MHz
Memory: 2 Gb DDR3 (128-bit)

GEFORCE GT 620M
GPU Architecture: Fermi
GPU Model: GF108
CUDA Cores: 96 
Base Clock speed (BOOST): 625 MHz (715 MHz)
Memory: 1 Gb DDR3 (64/128-bit)