Radeon R9 390 X2 and Radeon R9 280 - video card comparison
Radeon R9 390 X2
Radeon R9 280
Architecture
GCN 2.0 (2013−2017)
GCN 1.0 (2012−2020)
GPU code name
Grenada
Tahiti
Market segment
Desktop
Desktop
Release date
September 2015
March 2014
Bus support
-
PCIe 3.0
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
4x 8-pin
1 x 6-pin + 1 x 8-pin
Boost clock speed
-
933 MHz
Core clock speed
1000 MHz
-
Floating-point performance
2x 5,120 gflops
3,344 gflops
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
4,313 million
Pipelines / CUDA cores
2560
1792
Power consumption (TDP)
580 Watt
200 Watt
Texture fill rate
160.0
104.5
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
3 GB
Memory bus width
512 Bit
384 Bit
Memory clock speed
5400 MHz
1250 MHz
Memory bandwidth
345.6 GB/s
240 GB/s
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
-
1
HDMI
+
+
DisplayPort support
-
-
DirectX
12 (12_0)
DirectX® 12
Mantle
-
-
OpenCL
2.0
1.2
OpenGL
4.6
4.6
Shader Model
6.3
5.1
Vulkan
1.2.131
+
AppAcceleration
-
-
CrossFire
-
1
DDMA audio
-
+
Enduro
-
-
FreeSync
-
1
HD3D
-
+
LiquidVR
-
1
PowerTune
-
-
TressFX
-
1
TrueAudio
-
+
UVD
-
+
ZeroCore
-
-