Radeon R9 390 and Radeon R9 285X - video card comparison
Radeon R9 390
Radeon R9 285X
Architecture
GCN 2.0 (2013−2017)
GCN 3.0 (2014−2017)
GPU code name
Grenada
Tonga
Market segment
Desktop
Desktop
Release date
June 2015
-
Bus support
PCIe 3.0
-
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
1 x 6-pin, 1 x 8-pin
1x 6-pin + 1x 8-pin
Bridgeless CrossFire
1
-
Boost clock speed
1000 MHz
-
Core clock speed
-
1002 MHz
Floating-point performance
5,120 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
5,000 million
Pipelines / CUDA cores
2560
2048
Power consumption (TDP)
275 Watt
200 Watt
Texture fill rate
160.0
128.3
Memory type
GDDR5
GDDR5
Maximum RAM amount
0 MB
3 GB
Memory bus width
512 Bit
384 Bit
Memory clock speed
1000 MHz
5.5 GB/s
Memory bandwidth
384 GB/s
264.0 GB/s
High bandwidth memory (HBM)
-
-
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
2x DVI, 1x HDMI 1.4a, 1x DisplayPort 1.2
Eyefinity
1
-
Number of Eyefinity displays
6
-
HDMI
+
+
DisplayPort support
+
-
DirectX
DirectX® 12
12 (12_0)
Mantle
+
-
OpenCL
2.0
2.1
OpenGL
4.6
4.6
Shader Model
6.3
6.5
Vulkan
+
1.2.170
AppAcceleration
-
-
CrossFire
1
-
DDMA audio
+
-
Enduro
-
-
FreeSync
1
-
HD3D
-
-
PowerTune
+
-
TrueAudio
+
-
VCE
+
-
ZeroCore
-
-