GeForce GT 645M and Radeon RX 640 - video card comparison
Passmark - benchmark score GeForce GT 645M vs Radeon RX 640
GeForce GT 645M
957
Radeon RX 640
2020
GeForce GT 645M
Radeon RX 640
Architecture
Kepler (2012−2018)
Polaris (2016−2019)
GPU code name
N13P-GS
Polaris 12
Market segment
Laptop
Laptop
Release date
March 2012
August 2019
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
-
None
Boost clock speed
-
1218 MHz
Core clock speed
Up to 710 MHz
1218 MHz
CUDA cores
384
-
Floating-point performance
544.5 gflops
-
Manufacturing process technology
28 nm
14 nm
Number of transistors
1,270 million
2,200 million
Pipelines / CUDA cores
384
640
Power consumption (TDP)
32 Watt
50 Watt
Texture fill rate
22.7 billion/sec
38.98
Memory type
DDR3\GDDR5
GDDR5
Maximum RAM amount
2 GB
4 GB
Memory bus width
128bit
64 Bit
Memory clock speed
1800 MHz
6000 MHz
Memory bandwidth
Up to 64.0 GB/s
112.0 GB/s
Shared memory
-
-
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
12 (12_0)
CUDA
+
-
OpenCL
1.1
2.0
OpenGL
4.5
4.6
Shader Model
5.1
6.4
Vulkan
1.1.126
1.2.131
3D Blu-Ray
+
-
FreeSync
-
+
Optimus
+
-