Radeon R6 M255DX and GeForce GT 640M LE - video card comparison
Passmark - benchmark score Radeon R6 M255DX vs GeForce GT 640M LE
Radeon R6 M255DX
623
GeForce GT 640M LE
720
Radeon R6 M255DX
GeForce GT 640M LE
Architecture
GCN (2011−2017)
Fermi / Kepler (2012)
GPU code name
Jet UL(T) DDR3
N13P-LP
Market segment
Laptop
Laptop
Release date
June 2014
March 2012
Bus support
-
PCI Express 2.0, PCI Express 3.0
Interface
IGP
PCIe 2.0 x16
Boost clock speed
940 MHz
-
Core clock speed
855 / 514 MHz
Up to 500 MHz
CUDA cores
-
Up to 384
Floating-point performance
-
384.0 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
690 million
585 million
Pipelines / CUDA cores
576
384
Power consumption (TDP)
-
20 Watt
Texture fill rate
17.10
Up to 16.0 billion/sec
Memory type
DDR3
DDR3\DDR5
Maximum RAM amount
System Shared
2 GB
Memory bus width
System Shared
128bit
Memory clock speed
System Shared
1800 - 4000 MHz
Memory bandwidth
-
Up to 28.8 GB/s
Shared memory
+
-
Display Connectors
No outputs
No outputs
Eyefinity
+
-
HDMI
-
+
HDCP
-
+
Maximum VGA resolution
-
Up to 2048x1536
DirectX
12 (11_1)
12 API
CUDA
-
+
OpenCL
1.2
1.1
OpenGL
4.6
4.5
Shader Model
5.1
5.1
Vulkan
1.2.131
N/A
3D Blu-Ray
-
+
AppAcceleration
+
-
Optimus
-
+