Specifications Compared
| Spec | A100 | RTX-4090 |
|---|---|---|
| TDP | 400W | 450W |
| VRAM | 40-80 GB | 24 GB |
| CUDA Cores | 6,912 | 16,384 |
| Memory Type | HBM2e | GDDR6X |
| Architecture | Ampere | Ada Lovelace |
| Form Factors | SXM4, PCIe | PCIe |
| Interconnect | NVLink, PCIe 4.0, InfiniBand | PCIe 4.0 |
| Tensor Cores | 432 | 512 |
| FP16 Performance | 312 TFLOPS | 165 TFLOPS |
| FP32 Performance | 19.5 TFLOPS | 82.6 TFLOPS |
| FP64 Performance | 9.7 TFLOPS | 1.3 TFLOPS |
| INT8 Performance | 624 TOPS | 660 TOPS |
| Memory Bandwidth | 2,039 GB/s | 1,008 GB/s |
Performance Analysis
Memory specifications define workload feasibility: the A100 PCIe 80GB's 80 GB HBM2e VRAM accommodates larger models and batch sizes than the RTX 4090's 24 GB GDDR6X, preventing out-of-memory errors in LLM training. The A100's 2039 GB/s bandwidth, over twice the RTX 4090's 1008 GB/s, accelerates data movement, reducing bottlenecks in memory-bound operations like gradient computations.
Compute throughput varies by precision: A100 delivers 312 TFLOPS FP16 for efficient mixed-precision training, surpassing RTX 4090's 165 TFLOPS, while RTX 4090 leads in FP32 at 82.6 TFLOPS against A100's 19.5 TFLOPS, benefiting single-precision simulations. For inference, RTX 4090's 660 TFLOPS FP8 enables quantized model speedups. Higher TDP on RTX 4090 at 450W versus A100's 400W implies greater power draw per performance in consumer scenarios.
Real-world impacts include faster convergence on A100 for large-scale training due to interconnects like NVLink, unavailable on RTX 4090's PCIe 4.0 only.
Live Cloud Pricing
Real-time prices from 25+ providers. Updated every 60 seconds.
A100 PCIe 80GB
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 Vast.ai | NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 256 vCPU 63GB RAM 2826GB Storage | Slovenia | $0.73/GPU/hr | Available | ||
Vast.ai | 2×NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 256 vCPU 126GB RAM 794GB Storage | Slovenia | $0.73/GPU/hr $1.47/hr total (2×) | Available | ||
 LeaderGPU | 8×NVIDIA A100 PCIe 80GB 80GB VRAM | 80GB | 64 vCPU 384GB RAM 2000GB Storage | Netherlands | $0.90/GPU/hr $7.20/hr total (8×) | Available | ||
Vast.ai | NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 64 vCPU 63GB RAM 557GB Storage | Czechia | $1.00/GPU/hr | Available | ||
 Denvr | 8×NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 128 vCPU 1024GB RAM 15200GB Storage | Virginia | $1.15/GPU/hr $9.20/hr total (8×) |
RTX 4090
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 TensorDock | NVIDIA GeForce RTX 4090 24GB VRAM | 24GB | 0 vCPU 0GB RAM | Chubbuck, Idaho | $0.39/GPU/hr | Available | ||
Vast.ai | NVIDIA GeForce RTX 4090 24GB VRAM | 24GB | 32 vCPU 101GB RAM 152GB Storage | Iceland | $0.40/GPU/hr | Available | ||
TensorDock | NVIDIA GeForce RTX 4090 24GB VRAM | 24GB | 0 vCPU 0GB RAM | Orlando, Florida | $0.48/GPU/hr | Available | ||
Vast.ai | NVIDIA GeForce RTX 4090 24GB VRAM | 24GB | 32 vCPU 101GB RAM 108GB Storage | Iceland | $0.53/GPU/hr | Available | ||
Vast.ai | 4×NVIDIA GeForce RTX 4090 24GB VRAM | 24GB | 80 vCPU 157GB RAM 856GB Storage | United Kingdom | $0.67/GPU/hr $2.67/hr total (4×) | Available |
When to Choose the A100 PCIe 80GB
The A100 PCIe 80GB excels in large-scale AI training and distributed computing: its 80 GB VRAM fits massive LLMs, and 2039 GB/s bandwidth supports high-throughput batches. NVLink and InfiniBand enable efficient multi-GPU scaling, ideal for enterprise clusters where PCIe 4.0 on RTX 4090 falls short.
When to Choose the RTX 4090
The RTX 4090 suits budget-conscious prototyping and inference: from $0.16 per hour average $0.46 per hour, it provides 165 TFLOPS FP16 and 660 TFLOPS FP8 for smaller models within 24 GB VRAM. Ada Lovelace architecture optimizes graphics-heavy tasks like Stable Diffusion over A100's Ampere design.
Use Cases
A100's 80 GB HBM2e VRAM and 2039 GB/s bandwidth support massive models and large batches, exceeding RTX 4090's 24 GB GDDR6X limits.
RTX 4090's 660 TFLOPS FP8 accelerates quantized inference efficiently; A100 handles larger batches with 312 TFLOPS FP16.
RTX 4090's 24 GB VRAM suffices for most fine-tuning at $0.46 per hour average, offering better FP32 82.6 TFLOPS value.
RTX 4090 leverages Ada Lovelace for image generation with 82.6 TFLOPS FP32 and lower $0.16 per hour pricing.
A100's HBM2e memory and InfiniBand interconnect optimize HPC simulations requiring 2039 GB/s bandwidth.
Frequently Asked Questions
Is NVIDIA A100 PCIe 80GB better than RTX 4090 for ML training?▾
Yes, A100 outperforms with 80 GB HBM2e VRAM versus 24 GB GDDR6X and 312 TFLOPS FP16 against 165 TFLOPS. Its 2039 GB/s bandwidth doubles RTX 4090's 1008 GB/s for larger batches. Cloud pricing starts at $0.89 per hour for A100.
What is the VRAM difference between A100 80GB and RTX 4090?▾
A100 PCIe 80GB has 80 GB HBM2e; RTX 4090 offers 24 GB GDDR6X. This gap affects model size capacity in training. Bandwidth follows at 2039 GB/s for A100 versus 1008 GB/s.
RTX 4090 vs A100 cloud pricing?▾
RTX 4090 rents from $0.16 per hour average $0.46 per hour across 113 offers; A100 PCIe 80GB from $0.89 per hour average $2.08 per hour across 28 offers. RTX 4090 provides better value for light workloads.
Which has higher FP16 performance, A100 or RTX 4090?▾
A100 achieves 312 TFLOPS FP16; RTX 4090 reaches 165 TFLOPS. A100 suits training; RTX 4090 compensates with 660 TFLOPS FP8 for inference.
Can RTX 4090 replace A100 in multi-GPU setups?▾
No, RTX 4090 lacks NVLink and relies on PCIe 4.0; A100 supports NVLink and InfiniBand for scaling. A100's 400W TDP also fits data centers better than 450W.
A100 vs RTX 4090 for Stable Diffusion?▾
RTX 4090 performs better with Ada Lovelace architecture and 82.6 TFLOPS FP32 optimized for graphics. Its lower $0.46 per hour cost beats A100's $2.08 per hour average.
Which is cheaper to rent, the A100 or the RTX 4090?▾
Cloud rental prices for both the A100 and RTX 4090 vary by provider, configuration, and availability. This page shows live pricing from 25+ providers updated every 60 seconds. Scroll to the Live Cloud Pricing section to compare current rates.
How much VRAM does the A100 have compared to the RTX 4090?▾
The A100 has 40 to 80 GB of HBM2e memory. The RTX 4090 has 24 GB of GDDR6X memory.
Can I find A100 and RTX 4090 GPUs available to rent right now?▾
Yes. This page shows real-time availability across 25+ cloud GPU providers. The Live Cloud Pricing section displays only in-stock offers with current pricing.
What is the main difference between the A100 and the RTX 4090?▾
The A100 uses the Ampere architecture (2020) while the RTX 4090 uses Ada Lovelace (2022). The A100 delivers 1.9x the FP16 throughput and 2.0x the memory bandwidth of the RTX 4090.