Radeon R5 M255 and GeForce GT 420M - video card comparison
Passmark - benchmark score Radeon R5 M255 vs GeForce GT 420M
Radeon R5 M255
550
GeForce GT 420M
417
Radeon R5 M255
GeForce GT 420M
Architecture
GCN (2011−2017)
Fermi (2010−2014)
GPU code name
Topaz Pro / Sun
N11P-GE
Market segment
Laptop
Laptop
Release date
May 2014
September 2010
Bus support
PCIe 3.0 x8
-
Interface
PCIe 3.0 x8
PCIe 2.0 x16
Boost clock speed
940 MHz
-
Compute units
5
-
Core clock speed
940 MHz
500 MHz
CUDA cores
-
96
Floating-point performance
721.9 gflops
192 gflops
Manufacturing process technology
28 nm
40 nm
Number of transistors
1,550 million
585 million
Pipelines / CUDA cores
320
96
Power consumption (TDP)
-
23 Watt
Texture fill rate
22.56
6.0 billion/sec
Memory type
DDR3
(G)DDR3
Maximum RAM amount
4 GB
1 GB
Memory bus width
64 Bit
128 Bit
Memory clock speed
1000 MHz
800 MHz
Memory bandwidth
16 GB/s
25.6 GB/s
Shared memory
-
-
Display Connectors
No outputs
No outputs
Eyefinity
+
-
DirectX
DirectX® 11
12 API
CUDA
-
+
Mantle
+
-
OpenCL
Not Listed
1.1
OpenGL
4.4
4.5
Shader Model
6.3
5.1
Vulkan
-
N/A
AppAcceleration
+
-
DualGraphics
1
-
Enduro
-
-
HD3D
+
-
PowerTune
+
-
Switchable graphics
1
-
TrueAudio
-
-
ZeroCore
+
-