NVIDIA H100 SXM5 80 GB vs AMD Radeon Instinct MI455X
GPU Specs Compare
Graphics Card
Release Date
Oct 2022
Jul 2026
Generation
Server Hopper
Radeon Instinct
Type
AI GPU
Desktop
Bus Interface
PCIe 5.0 x16
PCIe 6.0 x16
Clock Speeds
Base Clock
1590 MHz
1000 MHz
Boost Clock
1980 MHz
2400 MHz
Memory Clock
1313 MHz
1900 MHz
Memory
Memory Size
80GB
432GB
Memory Type
HBM3
HBM4
Memory Bus
5120bit
24576bit
Bandwidth
3.36TB/s
23.3TB/s
Render Config
SM Count
132
-
Shading Units
16896
32768
TMUs
528
1024
ROPs
24
0
Tensor Cores
528
-
L1 Cache
256 KB (per SM)
32 KB (per CU)
L2 Cache
50 MB
192 MB
Compute Units
-
256
Theoretical Performance
Pixel Rate
47.52 GPixel/s
0 MPixel/s
Texture Rate
1045 GTexel/s
2457.6 GTexel/s
FP16 (half)
267.6 TFLOPS
157.3 TFLOPS
FP32 (float)
66.91 TFLOPS
157.3 TFLOPS
FP64 (double)
33.45 TFLOPS
2.458 TFLOPS
Graphics Processor
GPU Name
GH100
MI450 256CU
Architecture
Hopper
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
5 nm
2 nm
Transistors
80 billion
320 billion
Die Size
814 mm²
Unknown
Board Design
TDP
700W
2300W
Suggested PSU
1100 W
2700 W
Outputs
No outputs
No outputs
Power Connectors
None
None
Graphics Features
DirectX
N/A
N/A
OpenGL
N/A
N/A
OpenCL
3.0
3.0
Vulkan
N/A
N/A
CUDA
9.0
-
Shader Model
N/A
N/A