GeForce GT 640M and Radeon R5 M255 - video card comparison
Passmark - benchmark score GeForce GT 640M vs Radeon R5 M255
GeForce GT 640M
946
Radeon R5 M255
550
GeForce GT 640M
Radeon R5 M255
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
N13P-GS
Topaz Pro / Sun
Market segment
Laptop
Laptop
Release date
March 2012
May 2014
Bus support
PCI Express 2.0, PCI Express 3.0
PCIe 3.0 x8
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Boost clock speed
645 MHz
940 MHz
Compute units
-
5
Core clock speed
Up to 625 MHz
940 MHz
CUDA cores
384
-
Floating-point performance
480.0 gflops
721.9 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
1,270 million
1,550 million
Pipelines / CUDA cores
384
320
Power consumption (TDP)
32 Watt
-
Texture fill rate
Up to 20.0 billion/sec
22.56
Memory type
DDR3\GDDR5
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
128bit
64 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
-
+
HDMI
+
-
HDCP
+
-
Maximum VGA resolution
Up to 2048x1536
-
DirectX
12 API
DirectX® 11
CUDA
+
-
Mantle
-
+
OpenCL
1.1
Not Listed
OpenGL
4.5
4.4
Shader Model
5.1
6.3
Vulkan
1.1.126
-
3D Blu-Ray
+
-
AppAcceleration
-
+
DualGraphics
-
1
Enduro
-
-
HD3D
-
+
Optimus
+
-
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+