GeForce GT 640 and GeForce 256 DDR - video card comparison
GeForce GT 640
GeForce 256 DDR
Architecture
Kepler (2012−2018)
Celsius (1999−2005)
GPU code name
GK107
NV10 A3
Market segment
Desktop
Desktop
Release date
June 2012
December 1999
Interface
PCIe 3.0 x16
AGP 4x
Supplementary power connectors
None
None
Core clock speed
902 MHz
120 MHz
Floating-point performance
692.7 gflops
-
Manufacturing process technology
28 nm
220 nm
Number of transistors
1,270 million
17 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
65 Watt
-
Texture fill rate
28.86
0.48
Memory type
DDR3
DDR
Maximum RAM amount
2 GB
32 MB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
300 MHz
Memory bandwidth
28.51 GB/s
4.8 GB/s
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
1x VGA
HDMI
+
-
DirectX
12 (11_0)
7.0
CUDA
3.0
-
OpenCL
1.2
N/A
OpenGL
4.6
1.2
Shader Model
5.1
-
Vulkan
1.1.126
N/A