AMD Radeon R9 M390X vs AMD Radeon HD 7950 Mac Edition
GPU Specs Compare
Graphics Card
Release Date
May 2015
Mar 2013
Generation
Crystal System
Southern Islands
Type
Mobile
Desktop
Bus Interface
PCIe 3.0 x16
PCIe 3.0 x16
Clock Speeds
Memory Clock
1250 MHz
1250 MHz
Memory
Memory Size
4GB
3GB
Memory Type
GDDR5
GDDR5
Memory Bus
256bit
384bit
Bandwidth
160.0GB/s
240.0GB/s
Render Config
Compute Units
32
28
Shading Units
2048
1792
TMUs
128
112
ROPs
32
32
L1 Cache
16 KB (per CU)
16 KB (per CU)
L2 Cache
512 KB
768 KB
Theoretical Performance
Pixel Rate
23.14 GPixel/s
25.60 GPixel/s
Texture Rate
92.54 GTexel/s
89.60 GTexel/s
FP16 (half)
2.961 TFLOPS
-
FP32 (float)
2.961 TFLOPS
2.867 TFLOPS
FP64 (double)
185.1 GFLOPS
716.8 GFLOPS
Graphics Processor
GPU Name
Amethyst
Tahiti
GPU Variant
Amethyst XT
Tahiti PRO(215-0821056)
Architecture
GCN 3.0
GCN 1.0
Foundry
TSMC
TSMC
Process Size
28 nm
28 nm
Transistors
5 billion
4.313 billion
Die Size
366 mm²
352 mm²
Board Design
TDP
75W
200W
Outputs
No outputs
1x DVI1x HDMI 1.4a2x mini-DisplayPort 1.2
Power Connectors
None
2x 6-pin
Suggested PSU
-
550 W
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