Maxwell GPU Surface Book (940M, GDDR5) and GeForce 840M - video card comparison
Maxwell GPU Surface Book (940M, GDDR5)
GeForce 840M
Architecture
Maxwell (2014−2018)
Maxwell (2014−2018)
GPU code name
Surface Book
N15S-GT
Market segment
Laptop
Laptop
Release date
October 2015
March 2014
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
-
PCIe 3.0 x8
Boost clock speed
993 MHz
1124 MHz
Core clock speed
954 MHz
1029 MHz
Floating-point performance
-
863.2 gflops
Manufacturing process technology
28 nm
28 nm
Pipelines / CUDA cores
384
384
Power consumption (TDP)
-
33 Watt
Texture fill rate
-
17.98
Memory type
GDDR5
DDR3
Maximum RAM amount
1 GB
4 GB
Memory bus width
64 Bit
64 Bit
Memory clock speed
5012 MHz
2000 MHz
Memory bandwidth
-
16.02 GB/s
Shared memory
-
-
Display Connectors
-
No outputs
DirectX
DirectX 12 (FL 11_0), Shader 5.0
12 (11_0)
CUDA
+
+
OpenCL
-
1.2
OpenGL
-
4.5
Shader Model
-
5.1
Vulkan
-
1.1.126
GameWorks
-
+
GPU Boost
-
2.0
Optimus
+
+