AMD Radeon RX 6600S vs AMD Radeon R9 M390 Mac Edition
GPU · Specs Compare
Graphics Card
Release Date
Jan 2022
May 2015
Generation
Mobility Radeon
Crystal System
Type
Mobile
Mobile
Bus Interface
PCIe 4.0 x8
PCIe 3.0 x16
Clock Speeds
Base Clock
1700 MHz
—
Boost Clock
2000 MHz
—
Memory Clock
1750 MHz
1365 MHz
Memory
Memory Size
4GB
2GB
Memory Type
GDDR6
GDDR5
Memory Bus
128bit
256bit
Bandwidth
224.0GB/s
174.7GB/s
Render Config
Compute Units
28
16
Shading Units
1792
1024
TMUs
112
64
ROPs
64
32
RT Cores
28
—
L1 Cache
128 KB per Array
16 KB (per CU)
L2 Cache
2 MB
512 KB
L3 Cache
32 MB
—
Theoretical Performance
Pixel Rate
128.0 GPixel/s
30.66 GPixel/s
Texture Rate
224.0 GTexel/s
61.31 GTexel/s
FP16 (half)
14.34 TFLOPS
—
FP32 (float)
7.168 TFLOPS
1.962 TFLOPS
FP64 (double)
448.0 GFLOPS
122.6 GFLOPS
Graphics Processor
GPU Name
Navi 23
Pitcairn
Architecture
RDNA 2.0
GCN 1.0
Foundry
TSMC
TSMC
Process Size
7 nm
28 nm
Transistors
11.06 billion
2.8 billion
Die Size
237 mm²
212 mm²
GPU Variant
—
Pitcairn PRO(215-0828062)
Board Design
TDP
80W
80W
Outputs
No outputs
No outputs
Power Connectors
None
None
Graphics Features
DirectX
12 Ultimate (12_2)
12 (11_1)
OpenGL
4.6
4.6
OpenCL
2.1
1.2
Vulkan
1.3
1.2
Shader Model
6.5
5.1
Benchmark
3DMark Time Spy
7,700
—
3DMark Time Spy Extreme
3,389
—
▲ Specs Compare
Data sourced from official specifications and benchmark tests.