AMD Radeon Instinct MI455X vs NVIDIA RTX 4000 SFF Ada Generation
GPU · Specs Compare
Graphics Card
Release Date
Jul 2026
Nov 2018
Generation
Radeon Instinct
Radeon Instinct
Type
Desktop
Professional
Bus Interface
PCIe 6.0 x16
PCIe 4.0 x16
Clock Speeds
Base Clock
1000 MHz
1200 MHz
Boost Clock
2400 MHz
1746 MHz
Memory Clock
1900 MHz
1000 MHz
Memory
Memory Size
432GB
16GB
Memory Type
HBM4
HBM2
Memory Bus
24576bit
4096bit
Bandwidth
23.3TB/s
1.02TB/s
Render Config
Compute Units
256
60
Shading Units
32768
3840
TMUs
1024
240
ROPs
0
64
L1 Cache
32 KB (per CU)
16 KB (per CU)
L2 Cache
192 MB
4 MB
SM Count
—
48
Tensor Cores
—
192
RT Cores
—
48
Theoretical Performance
Pixel Rate
0 MPixel/s
111.7 GPixel/s
Texture Rate
2457.6 GTexel/s
419.0 GTexel/s
FP16 (half)
157.3 TFLOPS
26.82 TFLOPS
FP32 (float)
157.3 TFLOPS
13.41 TFLOPS
FP64 (double)
2.458 TFLOPS
6.705 TFLOPS
Graphics Processor
GPU Name
MI450 256CU
Vega 20
Architecture
CDNA 5.0
GCN 5.1
Foundry
TSMC
TSMC
Process Size
2 nm
7 nm
Transistors
320 billion
13.23 billion
Die Size
Unknown
331 mm²
GPU Variant
—
Vega 20 GLXT
Board Design
TDP
2300W
300W
Suggested PSU
2700 W
700 W
Outputs
No outputs
1x mini-DisplayPort 1.4a
Power Connectors
None
2x 8-pin
Graphics Features
DirectX
N/A
12 (12_1)
OpenGL
N/A
4.6
OpenCL
3.0
2.1
Vulkan
N/A
1.3
Shader Model
N/A
6.7
CUDA
—
8.9
▲ Specs Compare
Data sourced from official specifications and benchmark tests.