Radeon R9 390 X2 and Radeon HD 7870 - video card comparison
Radeon R9 390 X2
Radeon HD 7870
Architecture
GCN 2.0 (2013−2017)
GCN (2011−2017)
GPU code name
Grenada
Pitcairn XT
Market segment
Desktop
Desktop
Release date
September 2015
March 2012
Interface
PCIe 3.0 x16
PCIe 3.0 x16
Supplementary power connectors
4x 8-pin
2x 6-pin
Core clock speed
1000 MHz
1000 MHz
Floating-point performance
2x 5,120 gflops
-
Manufacturing process technology
28 nm
28 nm
Number of transistors
6,200 million
2800 Million
Pipelines / CUDA cores
2560
1280
Power consumption (TDP)
580 Watt
175 Watt
Texture fill rate
160.0
80.00
Memory type
GDDR5
GDDR5
Maximum RAM amount
8 GB
2 GB
Memory bus width
512 Bit
256 Bit
Memory clock speed
5400 MHz
4800 MHz
Memory bandwidth
345.6 GB/s
153.6 GB/s
Shared memory
-
-
Display Connectors
2x DVI, 1x HDMI, 1x DisplayPort
1x DVI, 1x HDMI, 2x mini-DisplayPort
Eyefinity
-
+
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