NVIDIA A40 VS NVIDIA A100 80GB
Both the A40 and A100 80GB are built on NVIDIA's Ampere architecture. This comparison helps you choose between different configurations within the same GPU family.
A100 80GB
📊 Detailed Specifications Comparison
| Specification | A40 | A100 80GB | Difference |
|---|---|---|---|
| Architecture & Design | |||
| Architecture | Ampere | Ampere | - |
| Process Node | 8nm | 7nm | - |
| Target Market | datacenter | datacenter | - |
| Form Factor | Dual-slot PCIe | SXM4 / PCIe | - |
| Memory | |||
| VRAM Capacity | 48GB | 80GB | -40% |
| Memory Type | GDDR6 | HBM2e | - |
| Memory Bandwidth | 696 GB/s | 2.0 TB/s | -66% |
| Memory Bus | 384-bit | 5120-bit | - |
| Compute Units | |||
| CUDA Cores | 10,752 | 6,912 | +56% |
| Tensor Cores | 336 | 432 | -22% |
| Performance (TFLOPS) | |||
| FP32 (Single Precision) | 37.4 TFLOPS | 19.5 TFLOPS | +92% |
| FP16 (Half Precision) | N/A | 312 TFLOPS | |
| TF32 (Tensor Float) | N/A | 156 TFLOPS | |
| FP64 (Double Precision) | N/A | 9.7 TFLOPS | |
| Power & Connectivity | |||
| TDP (Power) | 300W | 400W | -25% |
| PCIe | PCIe 4.0 x16 | PCIe 4.0 x16 | - |
| NVLink | Not available | NVLink 3.0 (600 GB/s) | - |
🎯 Use Case Recommendations
LLM & Large Model Training
NVIDIA A100 80GB
Higher VRAM capacity and memory bandwidth are critical for training large language models. The A100 80GB offers 80GB compared to 48GB.
AI Inference
NVIDIA A100 80GB
For inference workloads, performance per watt matters most. Consider the balance between FP16/INT8 throughput and power consumption.
Budget-Conscious Choice
NVIDIA A40
Based on current cloud pricing, the A40 starts at a lower hourly rate.
NVIDIA A40 is Best For:
- Visual computing
- AI inference
- HPC
NVIDIA A100 80GB is Best For:
- AI model training
- Scientific computing
- Newest FP8 precision workloads
Frequently Asked Questions
Which GPU is better for AI training: A40 or A100 80GB?
For AI training, the key factors are VRAM size, memory bandwidth, and tensor core performance. The A40 offers 48GB of GDDR6 memory with 696 GB/s bandwidth, while the A100 80GB provides 80GB of HBM2e with 2.0 TB/s bandwidth. For larger models, the A100 80GB's higher VRAM capacity gives it an advantage.
What is the price difference between A40 and A100 80GB in the cloud?
Cloud GPU rental prices vary by provider and region. Based on our data, A40 starts at $0.10/hour while A100 80GB starts at $0.40/hour. This represents a 75% price difference.
Can I use A100 80GB instead of A40 for my workload?
It depends on your specific requirements. If your model fits within 80GB of VRAM and you don't need the additional throughput of the A40, the A100 80GB can be a cost-effective alternative. However, for workloads requiring maximum memory capacity or multi-GPU scaling, the A40's architecture may be essential.
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