GeForce 840M and Radeon 660M - video card comparison
Passmark - benchmark score GeForce 840M vs Radeon 660M
GeForce 840M
1121
Radeon 660M
6474
GeForce 840M
Radeon 660M
Architecture
Maxwell (2014−2018)
RDNA 2 (2020−2022)
GPU code name
N15S-GT
RDNA 2 Rembrandt
Market segment
Laptop
Laptop
Release date
March 2014
January 2022
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x8
PCIe 4.0 x8
Supplementary power connectors
-
None
Boost clock speed
1124 MHz
1900 MHz
Core clock speed
1029 MHz
-
Floating-point performance
863.2 gflops
-
Manufacturing process technology
28 nm
6 nm
Number of transistors
-
13,100 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
33 Watt
45 Watt
Texture fill rate
17.98
45.60
Memory type
DDR3
System Shared
Maximum RAM amount
4 GB
System Shared
Memory bus width
64 Bit
System Shared
Memory clock speed
2000 MHz
System Shared
Memory bandwidth
16.02 GB/s
-
Shared memory
-
-
Display Connectors
No outputs
No outputs
DirectX
12 (11_0)
12 (12_1)
CUDA
+
-
OpenCL
1.2
2.0
OpenGL
4.5
4.6
Shader Model
5.1
6.5
Vulkan
1.1.126
1.2
GameWorks
+
-
GPU Boost
2.0
-
Optimus
+
-