AMD Radeon Instinct MI455X vs AMD Radeon RX 580
GPU Specs Compare
Graphics Card
Release Date
Jul 2026
Apr 2017
Generation
Radeon Instinct
Polaris
Type
Desktop
Desktop
Bus Interface
PCIe 6.0 x16
PCIe 3.0 x16
Clock Speeds
Base Clock
1000 MHz
1257 MHz
Boost Clock
2400 MHz
1340 MHz
Memory Clock
1900 MHz
2000 MHz
Memory
Memory Size
432GB
8GB
Memory Type
HBM4
GDDR5
Memory Bus
24576bit
256bit
Bandwidth
23.3TB/s
256.0GB/s
Render Config
Compute Units
256
36
Shading Units
32768
2304
TMUs
1024
144
ROPs
0
32
L1 Cache
32 KB (per CU)
16 KB (per CU)
L2 Cache
192 MB
2 MB
Theoretical Performance
Pixel Rate
0 MPixel/s
42.88 GPixel/s
Texture Rate
2457.6 GTexel/s
193.0 GTexel/s
FP16 (half)
157.3 TFLOPS
6.175 TFLOPS
FP32 (float)
157.3 TFLOPS
6.175 TFLOPS
FP64 (double)
2.458 TFLOPS
385.9 GFLOPS
Graphics Processor
GPU Name
MI450 256CU
Polaris 20
Architecture
CDNA 5.0
GCN 4.0
Foundry
TSMC
GlobalFoundries
Process Size
2 nm
14 nm
Transistors
320 billion
5.7 billion
Die Size
Unknown
232 mm²
GPU Variant
-
Polaris 20 XTX(215-0910038)
Board Design
TDP
2300W
185W
Suggested PSU
2700 W
450 W
Outputs
No outputs
1x HDMI 2.0b3x DisplayPort 1.4a
Power Connectors
None
1x 8-pin
Graphics Features
DirectX
N/A
12 (12_0)
OpenGL
N/A
4.6
OpenCL
3.0
2.1
Vulkan
N/A
1.3
Shader Model
N/A
6.7