NVIDIA Rubin GPU vs AMD Radeon Instinct MI455X
GPU Specs Compare
Graphics Card
Release Date
Jan 2026
Jul 2026
Generation
Server Rubin
Radeon Instinct
Type
Desktop
Desktop
Bus Interface
PCIe 6.0 x16
PCIe 6.0 x16
Clock Speeds
Base Clock
700 MHz
1000 MHz
Boost Clock
2267 MHz
2400 MHz
Memory Clock
2695 MHz
1900 MHz
Memory
Memory Size
288GB
432GB
Memory Type
HBM4
HBM4
Memory Bus
16384bit
24576bit
Bandwidth
22.1TB/s
23.3TB/s
Render Config
SM Count
224
-
Shading Units
28672
32768
TMUs
896
1024
ROPs
24
0
Tensor Cores
896
-
L1 Cache
256 KB (per SM)
32 KB (per CU)
L2 Cache
128 MB
192 MB
Compute Units
-
256
Theoretical Performance
Pixel Rate
54.41 GPixel/s
0 MPixel/s
Texture Rate
2031.2 GTexel/s
2457.6 GTexel/s
FP16 (half)
260.0 TFLOPS
157.3 TFLOPS
FP32 (float)
130.0 TFLOPS
157.3 TFLOPS
FP64 (double)
32.50 TFLOPS
2.458 TFLOPS
Graphics Processor
GPU Name
GR100
MI450 256CU
Architecture
Rubin
CDNA 5.0
Foundry
TSMC
TSMC
Process Size
3 nm
2 nm
Transistors
336 billion
320 billion
Die Size
1456 mm²
Unknown
Board Design
TDP
2300W
2300W
Suggested PSU
2700 W
2700 W
Outputs
No outputs
No outputs
Power Connectors
-
None
Graphics Features
DirectX
N/A
N/A
OpenGL
N/A
N/A
OpenCL
3.0
3.0
Vulkan
N/A
N/A
CUDA
10.7
-
Shader Model
N/A
N/A