GeForce GTX 980 SLI Mobile and GeForce GT 640M LE - video card comparison
GeForce GTX 980 SLI Mobile
GeForce GT 640M LE
Architecture
Maxwell (2014−2018)
Fermi / Kepler (2012)
GPU code name
N16E-GXX SLI
N13P-LP
Market segment
Laptop
Laptop
Release date
September 2015
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
-
PCIe 2.0 x16
SLI options
+
-
Boost clock speed
1228 MHz
-
Core clock speed
1126 MHz
Up to 500 MHz
CUDA cores
-
Up to 384
Floating-point performance
-
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
10400 Million
585 million
Pipelines / CUDA cores
4096
384
Power consumption (TDP)
330 Watt
20 Watt
Texture fill rate
-
Up to 16.0 billion/sec
Memory type
GDDR5
DDR3\DDR5
Maximum RAM amount
2x 8 GB
2 GB
Memory bus width
256 Bit
128bit
Memory clock speed
3500 MHz
1800 - 4000 MHz
Memory bandwidth
-
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
-
No outputs
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
G-SYNC support
+
-
DirectX
12_1
12 API
CUDA
+
+
OpenCL
-
1.1
OpenGL
-
4.5
Shader Model
-
5.1
Vulkan
-
N/A
3D Blu-Ray
-
+
Optimus
-
+