GeForce GT 640M and Radeon R7 M340 - video card comparison
Passmark - benchmark score GeForce GT 640M vs Radeon R7 M340
GeForce GT 640M
943
Radeon R7 M340
679
GeForce GT 640M
Radeon R7 M340
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
N13P-GS
Meso Pro DDR3
Market segment
Laptop
Laptop
Release date
March 2012
June 2015
Bus support
PCI Express 2.0, PCI Express 3.0
PCIe 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
-
None
Boost clock speed
645 MHz
1021 MHz
Compute units
-
6
Core clock speed
Up to 625 MHz
1021 MHz
CUDA cores
384
-
Floating-point performance
480.0 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)
32 Watt
-
Texture fill rate
Up to 20.0 billion/sec
17.16
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
128bit
128 Bit
Memory clock speed
1800 - 4000 MHz
1000 MHz
Memory bandwidth
Up to 64.0 GB/s
16 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
Eyefinity
-
1
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
DirectX® 12
CUDA
+
-
Mantle
-
+
OpenCL
1.1
Not Listed
OpenGL
4.5
4.4
Shader Model
5.1
5.1
Vulkan
1.1.126
+
3D Blu-Ray
+
-
AppAcceleration
-
-
DualGraphics
-
1
Enduro
-
-
FreeSync
-
1
HD3D
-
+
Optimus
+
-
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+