800M Series Laptop Graphics Cards NVIDIA GeForce: 820M, 840M, GTX 880M, etc.

GEFORCE GTX 880M
GPU Architecture: Kepler
GPU Model: GK104
CUDA Cores: 1536
Base Clock speed (BOOST): 954mhz
Memory: 8 Gb GDDR5 (256-bit)

GEFORCE GTX 870M
GPU Architecture: Kepler
GPU Model: GK104
CUDA Cores: 1344
Base Clock speed (BOOST): 941 MHz
Memory: 6 Gb GDDR5 (192-bit)

GEFORCE GTX 860M
GPU Architecture: Maxwell
GPU Model: GM107
CUDA Cores: 640
Base Clock speed (BOOST): 1029 MHz
Memory: 4 Gb GDDR5 (128-bit)

GEFORCE GTX 850M
GPU Architecture: Maxwell
GPU Model: GM107
CUDA Cores: 640
Base Clock speed (BOOST): 876 MHz
Memory: 4 Gb DDR3/GDDR5 (128-bit)

GEFORCE 840M
GPU Architecture: Maxwell
GPU Model: N15S-GT (GM108)
CUDA Cores: 384
Base Clock speed (BOOST): 1029 MHz (1124 MHz)
Memory: 1 Gb DDR3 (64-bit)

GEFORCE 830M
GPU Architecture: Maxwell
GPU Model: N15S-GT (GM108)
CUDA Cores: 384
Base Clock speed (BOOST): 1029 MHz (1150 MHz)
Memory: 1 Gb DDR3 (64-bit)

GEFORCE 820M
GPU Architecture: Fermi
GPU Model: NV15V-GM (GF117)
CUDA Cores: 96
Base Clock speed (BOOST): 775 MHz
Memory: 1 Gb DDR3 (64-bit)