AMD Radeon R9 M390 Mac Edition vs AMD Radeon R5 A255
We compared two Mobile platform GPUs: 2GB VRAM Radeon R9 M390 Mac Edition and 1024MB VRAM Radeon R5 A255 to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
AMD Radeon R9 M390 Mac Edition 's Advantages
Released 1 years and 4 months late
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (174.7GB/s vs 64.00GB/s)
640 additional rendering cores
AMD Radeon R5 A255 's Advantages
Boost Clock940MHz
Score
Benchmark
FP32 (float)
Radeon R9 M390 Mac Edition
+172%
1.962 TFLOPS
Radeon R5 A255
0.721 TFLOPS
Graphics Card
May 2015
Release Date
Jan 2014
Crystal System
Generation
All-In-One
Mobile
Type
Mobile
PCIe 3.0 x16
Bus Interface
PCIe 3.0 x8
Clock Speeds
-
Base Clock
925 MHz
-
Boost Clock
940 MHz
1365 MHz
Memory Clock
1000 MHz
Memory
2GB
Memory Size
1024MB
GDDR5
Memory Type
GDDR5
256bit
Memory Bus
128bit
174.7GB/s
Bandwidth
64.00GB/s
Render Config
16
Compute Units
6
-
-
-
1024
Shading Units
384
64
TMUs
24
32
ROPs
8
-
-
-
-
-
-
16 KB (per CU)
L1 Cache
16 KB (per CU)
512 KB
L2 Cache
256 KB
-
-
-
Theoretical Performance
30.66 GPixel/s
Pixel Rate
7.520 GPixel/s
61.31 GTexel/s
Texture Rate
22.56 GTexel/s
-
-
-
1.962 TFLOPS
FP32 (float)
721.9 GFLOPS
122.6 GFLOPS
FP64 (double)
-
Board Design
80W
TDP
Unknown
-
-
-
No outputs
Outputs
Portable Device Dependent
None
Power Connectors
-
Graphics Processor
Pitcairn
GPU Name
Topaz
Pitcairn PRO
(215-0828062)
GPU Variant
Topaz PRO
(216-0858030)
GCN 1.0
Architecture
GCN 3.0
TSMC
Foundry
TSMC
28 nm
Process Size
28 nm
2.8 billion
Transistors
1.55 billion
212 mm²
Die Size
125 mm²
Graphics Features
12 (11_1)
DirectX
12 (12_0)
4.6
OpenGL
4.6
1.2
OpenCL
2.1
1.2
Vulkan
1.2.170
-
-
-
5.1
Shader Model
6.5
