GeForce GTX 970M SLI and GeForce 840M - video card comparison
GeForce GTX 970M SLI
GeForce 840M
Architecture
Maxwell (2014−2018)
Maxwell (2014−2018)
GPU code name
-
N15S-GT
Market segment
Laptop
Laptop
Release date
October 2014
March 2014
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
-
PCIe 3.0 x8
SLI options
+
-
Boost clock speed
1038 MHz
1124 MHz
Core clock speed
924 MHz
1029 MHz
Floating-point performance
-
863.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2x 5200 Million
-
Pipelines / CUDA cores
2560
384
Power consumption (TDP)
162 Watt
33 Watt
Texture fill rate
-
17.98
Memory type
GDDR5
DDR3
Maximum RAM amount
2x 6 GB
4 GB
Memory bus width
2x 192 Bit
64 Bit
Memory clock speed
5000 MHz
2000 MHz
Memory bandwidth
-
16.02 GB/s
Shared memory
-
-
Display Connectors
-
No outputs
DirectX
12_1
12 (11_0)
CUDA
+
+
OpenCL
-
1.2
OpenGL
-
4.5
Shader Model
-
5.1
Vulkan
-
1.1.126
GameWorks
-
+
GPU Boost
-
2.0
Optimus
+
+