AMD Radeon Instinct MI325X vs NVIDIA B300 SXM6 AC
GPU Specs Compare
Graphics Card
Release Date
Oct 2024
Sep 2025
Generation
Radeon Instinct
Server Blackwell
Type
Professional
Desktop
Bus Interface
PCIe 5.0 x16
PCIe 6.0 x16
Clock Speeds
Base Clock
1000 MHz
1665 MHz
Boost Clock
2100 MHz
2032 MHz
Memory Clock
1500 MHz
2000 MHz
Memory
Memory Size
256GB
288GB
Memory Type
HBM3e
HBM3e
Memory Bus
8192bit
8192bit
Bandwidth
6.14TB/s
8.19TB/s
Render Config
Compute Units
304
-
Shading Units
19456
18944
TMUs
1216
592
ROPs
0
24
Tensor Cores
1216
592
L1 Cache
16 KB (per CU)
256 KB (per SM)
L2 Cache
16 MB
126 MB
L3 Cache
256 MB
-
SM Count
-
148
Theoretical Performance
Pixel Rate
0 MPixel/s
48.77 GPixel/s
Texture Rate
2553.6 GTexel/s
1202.9 GTexel/s
FP16 (half)
81.72 TFLOPS
76.99 TFLOPS
FP32 (float)
81.72 TFLOPS
76.99 TFLOPS
FP64 (double)
40.86 TFLOPS
1202.9 GFLOPS
Graphics Processor
GPU Name
Aqua Vanjaram
GB110
Architecture
CDNA 3.0
Blackwell Ultra
Foundry
TSMC
TSMC
Process Size
5 nm
5 nm
Transistors
153 billion
208 billion
Die Size
1017 mm²
1628 mm²
Board Design
TDP
1000W
1100W
Suggested PSU
1400 W
1500 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
Shader Model
N/A
N/A
CUDA
-
10.3