Radeon R7 M340 and GeForce GT 640M LE - video card comparison
Passmark - benchmark score Radeon R7 M340 vs GeForce GT 640M LE
Radeon R7 M340
679
GeForce GT 640M LE
720
Radeon R7 M340
GeForce GT 640M LE
Architecture
GCN (2011−2017)
Fermi / Kepler (2012)
GPU code name
Meso Pro DDR3
N13P-LP
Market segment
Laptop
Laptop
Release date
June 2015
March 2012
Bus support
PCIe 3.0
PCI Express 2.0, PCI Express 3.0
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Supplementary power connectors
None
-
Boost clock speed
1021 MHz
-
Compute units
6
-
Core clock speed
1021 MHz
Up to 500 MHz
CUDA cores
-
Up to 384
Floating-point performance
549.1 gflops
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
950 million
585 million
Pipelines / CUDA cores
320
384
Power consumption (TDP)
-
20 Watt
Texture fill rate
17.16
Up to 16.0 billion/sec
Memory type
DDR3
DDR3\DDR5
Maximum RAM amount
4 GB
2 GB
Memory bus width
128 Bit
128bit
Memory clock speed
1000 MHz
1800 - 4000 MHz
Memory bandwidth
16 GB/s
Up to 28.8 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
Eyefinity
1
-
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
DirectX® 12
12 API
CUDA
-
+
Mantle
+
-
OpenCL
Not Listed
1.1
OpenGL
4.4
4.5
Shader Model
5.1
5.1
Vulkan
+
N/A
3D Blu-Ray
-
+
AppAcceleration
-
-
DualGraphics
1
-
Enduro
-
-
FreeSync
1
-
HD3D
+
-
Optimus
-
+
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-