NVIDIA B300 SXM6 AC vs NVIDIA RTX A4000H
GPU Specs Compare
Graphics Card
Release Date
Sep 2025
Apr 2021
Generation
Server Blackwell
Quadro Ampere
Type
Desktop
Desktop
Bus Interface
PCIe 6.0 x16
PCIe 4.0 x16
Clock Speeds
Base Clock
1665 MHz
735 MHz
Boost Clock
2032 MHz
1560 MHz
Memory Clock
2000 MHz
1750 MHz
Memory
Memory Size
288GB
16GB
Memory Type
HBM3e
GDDR6
Memory Bus
8192bit
256bit
Bandwidth
8.19TB/s
448.0GB/s
Render Config
SM Count
148
48
Shading Units
18944
6144
TMUs
592
192
ROPs
24
96
Tensor Cores
592
192
L1 Cache
256 KB (per SM)
128 KB (per SM)
L2 Cache
126 MB
4 MB
RT Cores
-
48
Theoretical Performance
Pixel Rate
48.77 GPixel/s
149.8 GPixel/s
Texture Rate
1202.9 GTexel/s
299.5 GTexel/s
FP16 (half)
76.99 TFLOPS
19.17 TFLOPS
FP32 (float)
76.99 TFLOPS
19.17 TFLOPS
FP64 (double)
1202.9 GFLOPS
299.5 GFLOPS
Graphics Processor
GPU Name
GB110
GA104
Architecture
Blackwell Ultra
Ampere
Foundry
TSMC
Samsung
Process Size
5 nm
8 nm
Transistors
208 billion
17.4 billion
Die Size
1628 mm²
392 mm²
GPU Variant
-
GA104-???-A1
Board Design
TDP
1100W
140W
Suggested PSU
1500 W
300 W
Outputs
No outputs
4x DisplayPort 1.4a
Power Connectors
-
1x 6-pin
Graphics Features
DirectX
N/A
12 Ultimate (12_2)
OpenGL
N/A
4.6
OpenCL
3.0
3.0
Vulkan
N/A
1.3
CUDA
10.3
8.6
Shader Model
N/A
6.7