AMD Radeon HD 6850 X2 vs AMD Radeon R9 M390 Mac Edition
GPU · Specs Compare
Graphics Card
Release Date
Sep 2011
May 2015
Generation
Northern Islands
Crystal System
Type
Desktop
Mobile
Bus Interface
PCIe 2.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1050 MHz
1365 MHz
Memory
Memory Size
2GB
2GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
256bit
Bandwidth
134.4GB/s
174.7GB/s
Render Config
Compute Units
12
16
Shading Units
960
1024
TMUs
48
64
ROPs
32
32
L1 Cache
8 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
512 KB
Theoretical Performance
Pixel Rate
25.60 GPixel/s
30.66 GPixel/s
Texture Rate
38.40 GTexel/s
61.31 GTexel/s
FP32 (float)
1.536 TFLOPS
1.962 TFLOPS
FP64 (double)
—
122.6 GFLOPS
Graphics Processor
GPU Name
Barts
Pitcairn
GPU Variant
Barts PRO(215-0798006)
Pitcairn PRO(215-0828062)
Architecture
TeraScale 2
GCN 1.0
Foundry
TSMC
TSMC
Process Size
40 nm
28 nm
Transistors
1.7 billion
2.8 billion
Die Size
255 mm²
212 mm²
Board Design
TDP
254W
80W
Suggested PSU
600 W
—
Outputs
2x DVI1x HDMI 1.3a1x DisplayPort 1.1
No outputs
Power Connectors
2x 8-pin
None
Graphics Features
DirectX
11.2 (11_0)
12 (11_1)
OpenGL
4.4
4.6
OpenCL
1.2
1.2
Vulkan
N/A
1.2
Shader Model
5.0
5.1
▲ Specs Compare
Data sourced from official specifications and benchmark tests.