GeForce GT 640 and Radeon R5 M255 - video card comparison
Passmark - benchmark score GeForce GT 640 vs Radeon R5 M255
GeForce GT 640
1209
Radeon R5 M255
550
GeForce GT 640
Radeon R5 M255
Architecture
Kepler (2012−2018)
GCN (2011−2017)
GPU code name
GK107
Topaz Pro / Sun
Market segment
Desktop
Laptop
Release date
June 2012
May 2014
Bus support
-
PCIe 3.0 x8
Interface
PCIe 3.0 x16
PCIe 3.0 x8
Supplementary power connectors
None
-
Boost clock speed
-
940 MHz
Compute units
-
5
Core clock speed
902 MHz
940 MHz
Floating-point performance
692.7 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)
65 Watt
-
Texture fill rate
28.86
22.56
Memory type
DDR3
DDR3
Maximum RAM amount
2 GB
4 GB
Memory bus width
128 Bit
64 Bit
Memory clock speed
1782 MHz
1000 MHz
Memory bandwidth
28.51 GB/s
16 GB/s
Shared memory
-
-
Display Connectors
1x DVI, 1x HDMI, 1x DisplayPort
No outputs
Eyefinity
-
+
HDMI
+
-
DirectX
12 (11_0)
DirectX® 11
CUDA
3.0
-
Mantle
-
+
OpenCL
1.2
Not Listed
OpenGL
4.6
4.4
Shader Model
5.1
6.3
Vulkan
1.1.126
-
AppAcceleration
-
+
DualGraphics
-
1
Enduro
-
-
HD3D
-
+
PowerTune
-
+
Switchable graphics
-
1
TrueAudio
-
-
ZeroCore
-
+