GeForce GTX 280M and GeForce GT 640 OEM Rebrand - video card comparison
GeForce GTX 280M
GeForce GT 640 OEM Rebrand
Architecture
G9x (2007−2010)
Fermi 2.0 (2010−2014)
GPU code name
N10E-GTX
GF116
Market segment
Laptop
Desktop
Release date
March 2009
April 2012
Bus support
PCI-E 2.0
-
Interface
MXM-IV
PCIe 2.0 x16
Supplementary power connectors
-
None
SLI options
+
-
MXM Type
MXM 3.0 Type-B
-
Core clock speed
585 MHz
720 MHz
CUDA cores
128
-
Floating-point performance
374.5 gflops
414.7 gflops
Gigaflops
562
-
Manufacturing process technology
55 nm
40 nm
Number of transistors
754 million
1,170 million
Pipelines / CUDA cores
128
144
Power consumption (TDP)
75 Watt
75 Watt
Texture fill rate
38 billion/sec
17.28
Memory type
GDDR3
DDR3
Maximum RAM amount
1 GB
1536 MB
Memory bus width
256 Bit
192 Bit
Memory clock speed
Up to 950 MHz
1600 MHz
Memory bandwidth
61 GB/s
38.4 GB/s
Shared memory
-
-
Display Connectors
HDMIDual Link DVISingle Link DVIDisplayPortLVDSVGA
2x DVI, 1x mini-HDMI
HDMI
+
+
Maximum VGA resolution
2048x1536
-
Audio input for HDMI
S/PDIF
-
DirectX
11.1 (10_0)
12 (11_0)
CUDA
+
2.1
OpenCL
1.1
1.1
OpenGL
2.1
4.6
Shader Model
4.0
5.1
Vulkan
N/A
N/A
Power management
8.0
-