GeForce GTX 660 and GeForce 840M - video card comparison
Passmark - benchmark score GeForce GTX 660 vs GeForce 840M
GeForce GTX 660
4119
GeForce 840M
1121
GeForce GTX 660
GeForce 840M
Architecture
Kepler (2012−2018)
Maxwell (2014−2018)
GPU code name
GK106
N15S-GT
Market segment
Desktop
Laptop
Release date
September 2012
March 2014
Bus support
PCI Express 3.0
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
One 6-pin
-
SLI options
+
-
Boost clock speed
1033 MHz
1124 MHz
Core clock speed
980 MHz
1029 MHz
CUDA cores
960
-
Floating-point performance
1,981 gflops
863.2 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
2,540 million
-
Pipelines / CUDA cores
960
384
Power consumption (TDP)
140 Watt
33 Watt
Texture fill rate
78.4 billion/sec
17.98
Memory type
GDDR5
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
192-bit GDDR5
64 Bit
Memory clock speed
6.0 GB/s
2000 MHz
Memory bandwidth
144.2 GB/s
16.02 GB/s
Shared memory
-
-
Display Connectors
One Dual Link DVI-I, One Dual Link DVI-D, One HDMI, One DisplayPort
No outputs
Multi monitor support
4 displays
-
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
Internal
-
DirectX
12 (11_0)
12 (11_0)
CUDA
+
+
OpenCL
1.2
1.2
OpenGL
4.3
4.5
Shader Model
5.1
5.1
Vulkan
1.1.126
1.1.126
3D Blu-Ray
+
-
3D Gaming
+
-
3D Vision
+
-
GameWorks
-
+
GPU Boost
-
2.0
Optimus
-
+