AMD Radeon 660M vs NVIDIA B300 SXM6 AC
GPU Specs Compare
Graphics Card
Release Date
Jan 2022
Sep 2025
Generation
Rembrandt
Server Blackwell
Type
Integrated
Desktop
Bus Interface
PCIe 4.0 x8
PCIe 6.0 x16
Clock Speeds
Base Clock
1500 MHz
1665 MHz
Boost Clock
1900 MHz
2032 MHz
Memory Clock
System Shared
2000 MHz
Memory
Memory Size
System Shared
288GB
Memory Type
System Shared
HBM3e
Memory Bus
System Shared
8192bit
Bandwidth
System Dependent
8.19TB/s
Render Config
Compute Units
6
-
Shading Units
384
18944
TMUs
24
592
ROPs
16
24
RT Cores
6
-
L1 Cache
128 KB per Array
256 KB (per SM)
L2 Cache
2 MB
126 MB
SM Count
-
148
Tensor Cores
-
592
Theoretical Performance
Pixel Rate
30.40 GPixel/s
48.77 GPixel/s
Texture Rate
45.60 GTexel/s
1202.9 GTexel/s
FP16 (half)
2.918 TFLOPS
76.99 TFLOPS
FP32 (float)
1459 GFLOPS
76.99 TFLOPS
FP64 (double)
91.20 GFLOPS
1202.9 GFLOPS
Graphics Processor
GPU Name
Rembrandt
GB110
Architecture
RDNA 2.0
Blackwell Ultra
Foundry
TSMC
TSMC
Process Size
6 nm
5 nm
Transistors
13.1 billion
208 billion
Die Size
210 mm²
1628 mm²
Board Design
TDP
15W
1100W
Outputs
No outputs
No outputs
Power Connectors
None
-
Suggested PSU
-
1500 W
Graphics Features
DirectX
12 Ultimate (12_2)
N/A
OpenGL
4.6
N/A
OpenCL
2.0
3.0
Vulkan
1.2
N/A
Shader Model
6.5
N/A
CUDA
-
10.3
📊 Benchmark
3DMark Time Spy
1,537
-
3DMark Time Spy Extreme
701
-