AMD Radeon HD 7870 GHz Edition vs AMD Radeon R9 M385
GPU Specs Compare
Graphics Card
Release Date
Mar 2012
May 2015
Generation
Southern Islands
Gem System
Type
Desktop
Mobile
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1200 MHz
1200 MHz
Base Clock
-
900 MHz
Boost Clock
-
1000 MHz
Memory
Memory Size
2GB
4GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
128bit
Bandwidth
153.6GB/s
76.80GB/s
Render Config
Compute Units
20
14
Shading Units
1280
896
TMUs
80
56
ROPs
32
16
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
256 KB
Theoretical Performance
Pixel Rate
32.00 GPixel/s
16.00 GPixel/s
Texture Rate
80.00 GTexel/s
56.00 GTexel/s
FP32 (float)
2.560 TFLOPS
1.792 TFLOPS
FP64 (double)
160.0 GFLOPS
112.0 GFLOPS
Graphics Processor
GPU Name
Pitcairn
Strato
GPU Variant
Pitcairn XT(215-0828047)
Strato XT
Architecture
GCN 1.0
GCN 2.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
2.8 billion
2.08 billion
Die Size
212 mm²
160 mm²
Board Design
TDP
175W
Unknown
Suggested PSU
450 W
-
Outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Portable Device Dependent
Power Connectors
2x 6-pin
-
Graphics Features
DirectX
12 (11_1)
12 (12_0)
OpenGL
4.6
4.6
OpenCL
1.2
2.1
Vulkan
1.2
1.2.170
Shader Model
5.1
6.5