Radeon R9 390 X2 and GeForce GT 640 Rev. 2 - video card comparison
Radeon R9 390 X2
GeForce GT 640 Rev. 2
Architecture
GCN 2.0 (2013−2017)
Kepler 2.0 (2013−2015)
GPU code name
Grenada
GK208
Market segment
Desktop
Desktop
Release date
September 2015
May 2013
Interface
PCIe 3.0 x16
PCIe 2.0 x8
Supplementary power connectors
4x 8-pin
None
Core clock speed
1000 MHz
1046 MHz
Floating-point performance
2x 5,120 gflops
803.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
915 million
Pipelines / CUDA cores
2560
384
Power consumption (TDP)
580 Watt
49 Watt
Texture fill rate
160.0
33.47
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
1 GB
Memory bus width
512 Bit
64 Bit
Memory clock speed
5400 MHz
5008 MHz
Memory bandwidth
345.6 GB/s
40.06 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 1x VGA
HDMI
+
+
DirectX
12 (12_0)
12 (11_0)
CUDA
-
3.5
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
1.1.126