Radeon R9 390 X2 and GeForce GTX 660 OEM - video card comparison
Radeon R9 390 X2
GeForce GTX 660 OEM
Architecture
GCN 2.0 (2013−2017)
Kepler (2012−2018)
GPU code name
Grenada
GK104
Market segment
Desktop
Desktop
Release date
September 2015
August 2012
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
4x 8-pin
1x 6-pin
Boost clock speed
-
888 MHz
Core clock speed
1000 MHz
823 MHz
Floating-point performance
2x 5,120 gflops
2,046 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
3,540 million
Pipelines / CUDA cores
2560
1152
Power consumption (TDP)
580 Watt
130 Watt
Texture fill rate
160.0
85.25
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
2 GB
Memory bus width
512 Bit
256 Bit
Memory clock speed
5400 MHz
5600 MHz
Memory bandwidth
345.6 GB/s
179.2 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x HDMI, 1x DisplayPort
HDMI
+
+
DirectX
12 (12_0)
12 (11_0)
CUDA
-
3.0
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
1.1.126