GeForce GT 640M and GeForce 7900 GTX - video card comparison
Passmark - benchmark score GeForce GT 640M vs GeForce 7900 GTX
GeForce GT 640M
946
GeForce 7900 GTX
399
GeForce GT 640M
GeForce 7900 GTX
Architecture
Kepler (2012−2018)
Curie (2003−2013)
GPU code name
N13P-GS
G71
Market segment
Laptop
Desktop
Release date
March 2012
March 2006
Bus support
PCI Express 2.0, PCI Express 3.0
-
Interface
PCIe 3.0 x16
PCIe 1.0 x16
Supplementary power connectors
-
1x 6-pin
Boost clock speed
645 MHz
-
Core clock speed
Up to 625 MHz
650 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
-
Manufacturing process technology
28 nm
90 nm
Number of transistors
1,270 million
278 million
Pipelines / CUDA cores
384
-
Power consumption (TDP)
32 Watt
84 Watt
Texture fill rate
Up to 20.0 billion/sec
15.60
Memory type
DDR3\GDDR5
GDDR3
Maximum RAM amount
2 GB
512 MB
Memory bus width
128bit
256 Bit
Memory clock speed
1800 - 4000 MHz
1600 MHz
Memory bandwidth
Up to 64.0 GB/s
51.2 GB/s
Shared memory
-
-
Display Connectors
No outputs
2x DVI, 1x S-Video
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
9.0c (9_3)
CUDA
+
-
OpenCL
1.1
N/A
OpenGL
4.5
2.1
Shader Model
5.1
3.0
Vulkan
1.1.126
N/A
3D Blu-Ray
+
-
Optimus
+
-