Radeon RX 640 and Radeon 660M - video card comparison
Passmark - benchmark score Radeon RX 640 vs Radeon 660M
Radeon RX 640
2020
Radeon 660M
6474
Radeon RX 640
Radeon 660M
Architecture
Polaris (2016−2019)
RDNA 2 (2020−2022)
GPU code name
Polaris 12
RDNA 2 Rembrandt
Market segment
Laptop
Laptop
Release date
August 2019
January 2022
Interface
PCIe 3.0 x8
PCIe 4.0 x8
Supplementary power connectors
None
None
Boost clock speed
1218 MHz
1900 MHz
Core clock speed
1218 MHz
-
Manufacturing process technology
14 nm
6 nm
Number of transistors
2,200 million
13,100 million
Pipelines / CUDA cores
640
384
Power consumption (TDP)
50 Watt
45 Watt
Texture fill rate
38.98
45.60
Memory type
GDDR5
System Shared
Maximum RAM amount
4 GB
System Shared
Memory bus width
64 Bit
System Shared
Memory clock speed
6000 MHz
System Shared
Memory bandwidth
112.0 GB/s
-
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (12_0)
12 (12_1)
OpenCL
2.0
2.0
OpenGL
4.6
4.6
Shader Model
6.4
6.5
Vulkan
1.2.131
1.2
FreeSync
+
-