Radeon R9 390 X2 and Radeon R9 255 OEM - video card comparison
Radeon R9 390 X2
Radeon R9 255 OEM
Architecture
GCN 2.0 (2013−2017)
GCN 1.0 (2012−2020)
GPU code name
Grenada
Cape Verde
Market segment
Desktop
Desktop
Release date
September 2015
December 2013
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
4x 8-pin
1x 6-pin
Boost clock speed
-
930 MHz
Core clock speed
1000 MHz
900 MHz
Floating-point performance
2x 5,120 gflops
952.3 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
1,500 million
Pipelines / CUDA cores
2560
512
Power consumption (TDP)
580 Watt
65 Watt
Texture fill rate
160.0
29.76
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
2 GB
Memory bus width
512 Bit
128 Bit
Memory clock speed
5400 MHz
4600 MHz
Memory bandwidth
345.6 GB/s
73.6 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
No outputs
HDMI
+
-
DirectX
12 (12_0)
12 (11_1)
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
1.2.131