NVIDIA H800 SXM5 vs NVIDIA B300
GPU · Specs Compare
Graphics Card
Release Date
Mar 2023
Sep 2025
Generation
Server Hopper
Server Blackwell
Type
AI GPU
Desktop
Bus Interface
PCIe 5.0 x16
PCIe 5.0 x16
Clock Speeds
Base Clock
1095 MHz
1665 MHz
Boost Clock
1755 MHz
2032 MHz
Memory Clock
1313 MHz
2000 MHz
Memory
Memory Size
80GB
144GB
Memory Type
HBM3
HBM3e
Memory Bus
5120bit
4096bit
Bandwidth
3.36TB/s
4.10TB/s
Render Config
SM Count
132
148
Shading Units
16896
18944
TMUs
528
592
ROPs
24
24
Tensor Cores
528
592
L1 Cache
256 KB (per SM)
256 KB (per SM)
L2 Cache
50 MB
50 MB
Theoretical Performance
Pixel Rate
42.12 GPixel/s
48.77 GPixel/s
Texture Rate
926.6 GTexel/s
1202.9 GTexel/s
FP16 (half)
237.2 TFLOPS
1231.8 TFLOPS
FP32 (float)
59.30 TFLOPS
76.99 TFLOPS
FP64 (double)
29.65 TFLOPS
1202.9 GFLOPS
Graphics Processor
GPU Name
GH100
GB110
Architecture
Hopper
Blackwell Ultra
Foundry
TSMC
TSMC
Process Size
5 nm
5 nm
Transistors
80 billion
104 billion
Die Size
814 mm²
Unknown
Board Design
TDP
700W
1400W
Suggested PSU
1100 W
1800 W
Outputs
No outputs
No outputs
Power Connectors
8-pin EPS
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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
10.3
Shader Model
N/A
N/A
▲ Specs Compare
Data sourced from official specifications and benchmark tests.