AMD Radeon Instinct MI455X vs NVIDIA A40 PCIe
GPU Specs Compare
Graphics Card
Release Date
Jul 2026
Oct 2020
Generation
Radeon Instinct
Tesla
Type
Desktop
Desktop
Bus Interface
PCIe 6.0 x16
PCIe 4.0 x16
Clock Speeds
Base Clock
1000 MHz
1305 MHz
Boost Clock
2400 MHz
1740 MHz
Memory Clock
1900 MHz
1812 MHz
Memory
Memory Size
432GB
48GB
Memory Type
HBM4
GDDR6
Memory Bus
24576bit
384bit
Bandwidth
23.3TB/s
695.8GB/s
Render Config
Compute Units
256
-
Shading Units
32768
10752
TMUs
1024
336
ROPs
0
112
L1 Cache
32 KB (per CU)
128 KB (per SM)
L2 Cache
192 MB
6 MB
SM Count
-
84
Tensor Cores
-
336
RT Cores
-
84
Theoretical Performance
Pixel Rate
0 MPixel/s
194.9 GPixel/s
Texture Rate
2457.6 GTexel/s
584.6 GTexel/s
FP16 (half)
157.3 TFLOPS
37.42 TFLOPS
FP32 (float)
157.3 TFLOPS
37.42 TFLOPS
FP64 (double)
2.458 TFLOPS
584.6 GFLOPS
Graphics Processor
GPU Name
MI450 256CU
GA102
Architecture
CDNA 5.0
Ampere
Foundry
TSMC
Samsung
Process Size
2 nm
8 nm
Transistors
320 billion
28.3 billion
Die Size
Unknown
628 mm²
Board Design
TDP
2300W
300W
Suggested PSU
2700 W
700 W
Outputs
No outputs
3x DisplayPort 1.4a
Power Connectors
None
8-pin EPS
Graphics Features
DirectX
N/A
12 Ultimate (12_2)
OpenGL
N/A
4.6
OpenCL
3.0
3.0
Vulkan
N/A
1.3
Shader Model
N/A
6.6
CUDA
-
8.6