GeForce GTX 980M SLI and GeForce GT 640 - video card comparison
GeForce GTX 980M SLI
GeForce GT 640
Architecture
Maxwell (2014−2018)
Kepler (2012−2018)
GPU code name
-
GK107
Market segment
Laptop
Desktop
Release date
October 2014
June 2012
Interface
-
PCIe 3.0 x16
Supplementary power connectors
-
None
SLI options
+
-
Boost clock speed
1127 MHz
-
Core clock speed
1038 MHz
902 MHz
Floating-point performance
-
692.7 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2x 5200 Million
1,270 million
Pipelines / CUDA cores
3072
384
Power consumption (TDP)
200 Watt
65 Watt
Texture fill rate
-
28.86
Memory type
GDDR5
DDR3
Maximum RAM amount
2x 8 GB
2 GB
Memory bus width
2x 256 Bit
128 Bit
Memory clock speed
5000 MHz
1782 MHz
Memory bandwidth
-
28.51 GB/s
Shared memory
-
-
Display Connectors
-
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
-
+
DirectX
12_1
12 (11_0)
CUDA
+
3.0
OpenCL
-
1.2
OpenGL
-
4.6
Shader Model
-
5.1
Vulkan
+
1.1.126
Optimus
+
-