GeForce GTX 660 Rev. 2 and Radeon 680M - video card comparison
GeForce GTX 660 Rev. 2
Radeon 680M
Architecture
Kepler (2012−2018)
RDNA 2 (2020−2022)
GPU code name
GK104
RDNA 2 Rembrandt
Market segment
Desktop
Laptop
Release date
September 2014
January 2022
Interface
PCIe 3.0 x16
PCIe 4.0 x8
Supplementary power connectors
1x 6-pin
None
Boost clock speed
1032 MHz
2400 MHz
Core clock speed
980 MHz
-
Floating-point performance
1,981 gflops
-
Manufacturing process technology
28 nm
6 nm
Number of transistors
3,540 million
13,100 million
Pipelines / CUDA cores
960
768
Power consumption (TDP)
140 Watt
45 Watt
Texture fill rate
82.56
115.2
Memory type
GDDR5
System Shared
Maximum RAM amount
2 GB
System Shared
Memory bus width
192 Bit
System Shared
Memory clock speed
6008 MHz
System Shared
Memory bandwidth
144.2 GB/s
-
Shared memory
-
-
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (11_0)
12 (12_1)
CUDA
3.0
-
OpenCL
1.2
2.0
OpenGL
4.6
4.6
Shader Model
5.1
6.5
Vulkan
1.1.126
1.2