Radeon R9 M275X and GeForce GT 640 Rev. 2 - video card comparison
Radeon R9 M275X
GeForce GT 640 Rev. 2
Architecture
GCN 1.0 (2012−2020)
Kepler 2.0 (2013−2015)
GPU code name
Venus
GK208
Market segment
Desktop
Desktop
Release date
January 2014
May 2013
Bus support
PCIe 3.0 x16
-
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Supplementary power connectors
-
None
Boost clock speed
925 MHz
-
Compute units
10
-
Core clock speed
900 MHz
1046 MHz
Floating-point performance
1,184 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,500 million
915 million
Pipelines / CUDA cores
640
384
Power consumption (TDP)
-
49 Watt
Texture fill rate
37.00
33.47
Memory type
GDDR5
GDDR5
Maximum RAM amount
4 GB
1 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
1125 MHz
5008 MHz
Memory bandwidth
72 GB/s
40.06 GB/s
Display Connectors
No outputs
1x DVI, 1x HDMI, 1x VGA
Eyefinity
1
-
HDMI
-
+
DirectX
DirectX® 11
12 (11_0)
CUDA
-
3.5
Mantle
+
-
OpenCL
Not Listed
1.2
OpenGL
4.4
4.6
Shader Model
5.1
5.1
Vulkan
-
1.1.126
AppAcceleration
-
-
DualGraphics
1
-
Enduro
-
-
FreeSync
1
-
HD3D
+
-
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-