Specifications Compared
| Spec | A100 SXM4 80GB | RTX 4090 |
|---|---|---|
| TDP | 400W | 450W |
| VRAM | 80 GB | 24 GB |
| CUDA Cores | 6,912 | 16,384 |
| FP8 (dense) | Not published | 330.3 TFLOPS |
| Memory Type | HBM2e | GDDR6X |
| Architecture | Ampere | Ada Lovelace |
| FP16 (dense) | 312 TFLOPS | 165.2 TFLOPS |
| Form Factors | SXM4 | PCIe |
| INT8 (dense) | 624 TOPS | 660.6 TOPS |
| Interconnect | NVLink, PCIe 4.0, InfiniBand | PCIe 4.0 |
| Tensor Cores | 432 | 512 |
| FP32 Performance | 19.5 TFLOPS | 82.6 TFLOPS |
| FP64 Performance | 9.7 TFLOPS | 1.3 TFLOPS |
| Memory Bandwidth | 2,039 GB/s | 1,008 GB/s |
| FP8 (with sparsity) | Not published | 660.6 TFLOPS |
| FP16 (with sparsity) | 624 TFLOPS | 330.4 TFLOPS |
| INT8 (with sparsity) | 1,248 TOPS | 1,321.2 TOPS |
Performance Analysis
The A100 delivers 312 TFLOPS in dense FP16 while the RTX 4090 reaches 165.2 TFLOPS in dense FP16 so training sessions on the A100 process larger models without sparsity techniques. Sparse FP16 figures show 624 TFLOPS on the A100 against 330.4 TFLOPS on the RTX 4090 allowing equivalent scaling when sparsity applies. Memory bandwidth shared at 2039 GB/s for the A100 family versus 1008 GB/s for the RTX 4090 family permits larger batch sizes on the A100 during inference or training. FP32 performance shared at 19.5 TFLOPS for the A100 family versus 82.6 TFLOPS for the RTX 4090 family favors the RTX 4090 for precision sensitive scientific tasks.
Current On-Demand Offers
Cheapest secure on-demand offer per provider that is reported in stock right now, per GPU per hour; multi-GPU instances show the whole-instance price alongside. Deploy opens the DeployGPU console for providers on the platform, otherwise the provider's own site. Stock is rechecked every minute.
A100 SXM4 80GB
| Provider | Region | GPUs | Per GPU / hr | Instance / hr | Deploy |
|---|---|---|---|---|---|
| Vast.ai | Slovenia, SI | 2 | $0.67 | $1.33 | Deploy |
| LeaderGPU | The Netherlands | 8 | $0.68 | $5.42 | Deploy |
| ThunderCompute | USA | 1 | $1.09 | — | Deploy |
| Hyperstack | CANADA-1 | 2 | $1.35 | $2.70 | Deploy |
| Massed Compute | us-central-3 | 8 | $1.38 | $11.04 | Deploy |
11 providers in stock, 41 offers (cheapest per provider shown). All A100 SXM4 80GB offers, price history and alerts
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When to Choose the A100 SXM4 80GB
The A100 SXM4 80GB suits large scale model training that needs 80 GB HBM2e capacity and NVLink interconnect. Its 2039 GB/s bandwidth supports extended batch processing in dense FP16 at 312 TFLOPS for memory bound workloads.
When to Choose the RTX 4090
The RTX 4090 fits FP32 heavy inference or simulation jobs that use its 82.6 TFLOPS throughput and 24 GB GDDR6X memory. Its 450W TDP and PCIe form factor integrate easily into standard consumer systems for dense FP16 workloads at 165.2 TFLOPS.
Use Cases
The A100 SXM4 80GB supplies 80 GB HBM2e memory and 312 TFLOPS dense FP16 for handling large models.
The A100 provides 2039 GB/s bandwidth and 624 TFLOPS sparse FP16 to manage extended sequences.
Both GPUs handle fine-tuning with the A100 offering 80 GB capacity and the RTX 4090 providing 82.6 TFLOPS FP32.
The RTX 4090 achieves 165.2 TFLOPS dense FP16 and 450W TDP for image generation pipelines.
The RTX 4090 delivers 82.6 TFLOPS FP32 on a PCIe form factor suited to precision calculations.
Frequently Asked Questions
What FP16 performance do these GPUs provide in dense mode?▾
The A100 family shares 312 TFLOPS dense FP16 and the RTX 4090 family shares 165.2 TFLOPS dense FP16. Direct comparison uses these matching dense figures.
Which GPU offers higher memory bandwidth?▾
The A100 family shares 2039 GB/s memory bandwidth while the RTX 4090 family shares 1008 GB/s. Bandwidth remains a family level specification for both.
What interconnect options exist on the A100 SXM4 80GB versus the RTX 4090?▾
The A100 SXM4 80GB supports NVLink and InfiniBand in addition to PCIe 4.0 while the RTX 4090 supports PCIe 4.0 only.
How do TDP values compare between these two GPUs?▾
The A100 family shares a 400W TDP and the RTX 4090 family shares a 450W TDP. These figures apply across variants within each family.
Which is cheaper to rent, the A100 SXM4 80GB or the RTX 4090?▾
Cloud rental prices for both the A100 SXM4 80GB 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 SXM4 80GB have compared to the RTX 4090?▾
The A100 SXM4 80GB has 80 GB of HBM2e memory. The RTX 4090 has 24 GB of GDDR6X memory.
Can I find A100 SXM4 80GB 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 SXM4 80GB and the RTX 4090?▾
The A100 SXM4 80GB uses the Ampere architecture (2020) while the RTX 4090 uses Ada Lovelace (2022). The A100 SXM4 80GB delivers 1.9x the dense FP16 throughput (312 vs 165.2 TFLOPS, both without sparsity) and 2.0x the memory bandwidth of the RTX 4090.
Rent these GPUs
Each GPU page lists every current on-demand offer by provider, per GPU-hour, updated every minute.
Related comparisons
How this page is made
- Specifications come from the NVIDIA, AMD and Intel datasheets for the A100 SXM4 80GB and the RTX 4090. Dense and sparse throughput are listed separately.
- Prices and availability are live: every offer shown is an in-stock, on-demand listing from a provider we track, rechecked every minute.
- The written comparison (overview, performance notes, when to choose each card, verdict, use cases and FAQ) was drafted with an AI model from the specification table above and passed an automated check that rejects any figure not in that table. It was last generated on . It contains no prices; those are always read live.
- Read how we collect the data, or report an error on this page.
Next steps
- Rent A100Every current offer by provider, daily price history and a price alert.
- Rent RTX 4090Every current offer by provider, daily price history and a price alert.
- GPU price indexHow on-demand prices for the major GPUs have moved, updated daily.
- All GPUsEvery GPU we track, with current lows and provider counts.