GeForce GT 640 and Radeon R7 M340 - video card comparison
Passmark - benchmark score GeForce GT 640 vs Radeon R7 M340
GeForce GT 640
1209
Radeon R7 M340
679
GeForce GT 640
Radeon R7 M340
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
GK107
Meso Pro DDR3
Market segment
Desktop
Laptop
Release date
June 2012
June 2015
Bus support
-
PCIe 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
None
None
Boost clock speed
-
1021 MHz
Compute units
-
6
Core clock speed
902 MHz
1021 MHz
Floating-point performance
692.7 gflops
549.1 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
950 million
Pipelines / CUDA cores
384
320
Power consumption (TDP)
65 Watt
-
Texture fill rate
28.86
17.16
Memory type
DDR3
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
128 Bit
128 Bit
Memory clock speed
1782 MHz
1000 MHz
Memory bandwidth
28.51 GB/s
16 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
Eyefinity
-
1
HDMI
+
-
DirectX
12 (11_0)
DirectX® 12
CUDA
3.0
-
Mantle
-
+
OpenCL
1.2
Not Listed
OpenGL
4.6
4.4
Shader Model
5.1
5.1
Vulkan
1.1.126
+
AppAcceleration
-
-
DualGraphics
-
1
Enduro
-
-
FreeSync
-
1
HD3D
-
+
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+