Radeon R5 M255 and Radeon HD 7640G + HD 7670M Dual Graphics - video card comparison
Radeon R5 M255
Radeon HD 7640G + HD 7670M Dual Graphics
Architecture
GCN (2011−2017)
Terascale 3 (2010−2013)
GPU code name
Topaz Pro / Sun
-
Market segment
Laptop
Laptop
Release date
May 2014
May 2012
Bus support
PCIe 3.0 x8
-
Interface
PCIe 3.0 x8
-
Boost clock speed
940 MHz
-
Compute units
5
-
Core clock speed
940 MHz
655 / 600 MHz
Floating-point performance
721.9 gflops
-
Manufacturing process technology
28 nm
40 nm
Number of transistors
1,550 million
-
Pipelines / CUDA cores
320
736
Texture fill rate
22.56
-
Memory type
DDR3
-
Maximum RAM amount
4 GB
-
Memory bus width
64 Bit
128 Bit
Memory clock speed
1000 MHz
1800 MHz
Memory bandwidth
16 GB/s
-
Shared memory
-
+
Display Connectors
No outputs
-
Eyefinity
+
-
DirectX
DirectX® 11
11
Mantle
+
-
OpenCL
Not Listed
-
OpenGL
4.4
-
Shader Model
6.3
-
AppAcceleration
+
-
DualGraphics
1
-
Enduro
-
-
HD3D
+
-
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-