GeForce GT 640 and T400 4 GB - video card comparison
Passmark - benchmark score GeForce GT 640 vs T400 4 GB
GeForce GT 640
1209
T400 4 GB
3831
GeForce GT 640
T400 4 GB
Architecture
Kepler (2012−2018)
Turing (2018−2021)
GPU code name
GK107
TU117
Market segment
Desktop
Desktop
Release date
June 2012
May 2021
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
None
None
Boost clock speed
-
1425 MHz
Core clock speed
902 MHz
-
Floating-point performance
692.7 gflops
-
Manufacturing process technology
28 nm
12 nm
Number of transistors
1,270 million
4,700 million
Pipelines / CUDA cores
384
384
Power consumption (TDP)
65 Watt
30 Watt
Texture fill rate
28.86
34.20
Memory type
DDR3
GDDR6
Maximum RAM amount
2 GB
4 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
1782 MHz
10 GB/s
Memory bandwidth
28.51 GB/s
80 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
3x mini-DisplayPort
HDMI
+
-
DirectX
12 (11_0)
12 (12_1)
CUDA
3.0
7.5
OpenCL
1.2
3.0
OpenGL
4.6
4.6
Shader Model
5.1
6.6
Vulkan
1.1.126
1.2