AMD Radeon RX 6600M vs AMD Radeon Instinct MI455X
GPU Specs Compare
Graphics Card
Release Date
May 2021
Jul 2026
Generation
Mobility Radeon
Radeon Instinct
Type
Mobile
Desktop
Bus Interface
PCIe 4.0 x8
PCIe 6.0 x16
Clock Speeds
Base Clock
2068 MHz
1000 MHz
Boost Clock
2416 MHz
2400 MHz
Memory Clock
1750 MHz
1900 MHz
Memory
Memory Size
8GB
432GB
Memory Type
GDDR6
HBM4
Memory Bus
128bit
24576bit
Bandwidth
224.0GB/s
23.3TB/s
Render Config
Compute Units
28
256
Shading Units
1792
32768
TMUs
112
1024
ROPs
64
0
RT Cores
28
-
L1 Cache
128 KB per Array
32 KB (per CU)
L2 Cache
2 MB
192 MB
L3 Cache
32 MB
-
Theoretical Performance
Pixel Rate
154.6 GPixel/s
0 MPixel/s
Texture Rate
270.6 GTexel/s
2457.6 GTexel/s
FP16 (half)
17.32 TFLOPS
157.3 TFLOPS
FP32 (float)
8.659 TFLOPS
157.3 TFLOPS
FP64 (double)
541.2 GFLOPS
2.458 TFLOPS
Graphics Processor
GPU Name
Navi 23
MI450 256CU
Architecture
RDNA 2.0
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
7 nm
2 nm
Transistors
11.06 billion
320 billion
Die Size
237 mm²
Unknown
Board Design
TDP
100W
2300W
Outputs
No outputs
No outputs
Power Connectors
None
None
Suggested PSU
-
2700 W
Graphics Features
DirectX
12 Ultimate (12_2)
N/A
OpenGL
4.6
N/A
OpenCL
2.1
3.0
Vulkan
1.3
N/A
Shader Model
6.5
N/A