AMD Radeon R9 390 X2 vs AMD Radeon HD 8870 OEM
GPU · Specs Compare
Graphics Card
Release Date
Sep 2015
Jan 2013
Generation
Pirate Islands
Sea Islands
Type
Desktop
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1350 MHz
1200 MHz
Memory
Memory Size
8GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
512bit
256bit
Bandwidth
345.6GB/s
153.6GB/s
Render Config
Compute Units
40
20
Shading Units
2560
1280
TMUs
160
80
ROPs
64
32
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
1024 KB
512 KB
Theoretical Performance
Pixel Rate
64.00 GPixel/s
32.00 GPixel/s
Texture Rate
160.0 GTexel/s
80.00 GTexel/s
FP32 (float)
5.120 TFLOPS
2.560 TFLOPS
FP64 (double)
640.0 GFLOPS
160.0 GFLOPS
Graphics Processor
GPU Name
Grenada
Pitcairn
GPU Variant
Grenada PRO(215-0880030)
Pitcairn XT(215-0828047)
Architecture
GCN 2.0
GCN 1.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
6.2 billion
2.8 billion
Die Size
438 mm²
212 mm²
Board Design
TDP
580W
175W
Suggested PSU
950 W
450 W
Outputs
2x DVI1x HDMI 1.4a1x DisplayPort 1.2
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
4x 8-pin
2x 6-pin
Graphics Features
DirectX
12 (12_0)
12 (11_1)
OpenGL
4.6
4.6
OpenCL
2.0
1.2
Vulkan
1.2
1.2
Shader Model
6.3
5.1
▲ Specs Compare
Data sourced from official specifications and benchmark tests.