Specifications Compared
| Spec | RTX 4090 | RTX A4000 |
|---|---|---|
| TDP | 450W | 140W |
| VRAM | 24 GB | 16-20 GB |
| CUDA Cores | 16,384 | 6,144 |
| FP8 (dense) | 330.3 TFLOPS | Not published |
| Memory Type | GDDR6X | GDDR6 |
| Architecture | Ada Lovelace | Ampere |
| FP16 (dense) | 165.2 TFLOPS | Not published |
| Form Factors | PCIe | PCIe |
| INT8 (dense) | 660.6 TOPS | Not published |
| Interconnect | PCIe 4.0 | PCIe 4.0 |
| Tensor Cores | 512 | 192 |
| FP32 Performance | 82.6 TFLOPS | 19.2 TFLOPS |
| FP64 Performance | 1.3 TFLOPS | Not published |
| Memory Bandwidth | 1,008 GB/s | 448 GB/s |
| FP8 (with sparsity) | 660.6 TFLOPS | Not published |
| FP16 (with sparsity) | 330.4 TFLOPS | 153.4 TFLOPS |
| INT8 (with sparsity) | 1,321.2 TOPS | Not published |
Performance Analysis
The RTX 4090 delivers 165.2 TFLOPS in dense FP16 while the RTX A4000 publishes no dense FP16 figure. In FP16 with sparsity the RTX 4090 reaches 330.4 TFLOPS against 153.4 TFLOPS on the RTX A4000. The RTX 4090 also supplies 82.6 TFLOPS in FP32 compared with 19.2 TFLOPS on the RTX A4000. Higher memory bandwidth on the RTX 4090 supports larger batch sizes during both training and inference workloads that move substantial tensor data. The FP16 with sparsity advantage on the RTX 4090 scales similarly to its dense FP16 advantage when both figures are compared directly to the corresponding RTX A4000 values.
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.
RTX 4090
| Provider | Region | GPUs | Per GPU / hr | Instance / hr | Deploy |
|---|---|---|---|---|---|
| Vast.ai | United Kingdom, GB | 2 | $0.43 | $0.85 | Deploy |
| RunPod | global | 1 | $0.74 | — | Deploy |
| LeaderGPU | The Netherlands | 8 | $0.88 | $7.04 | Deploy |
3 providers in stock, 9 offers (cheapest per provider shown). All RTX 4090 offers, price history and alerts
RTX A4000
| Provider | Region | GPUs | Per GPU / hr | Instance / hr | Deploy |
|---|---|---|---|---|---|
| Hyperstack | NORWAY-1 | 1 | $0.15 | — | Deploy |
| Paperspace | ca1 | 1 | $0.76 | — | Deploy |
2 providers in stock, 10 offers (cheapest per provider shown). All RTX A4000 offers, price history and alerts
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When to Choose the RTX 4090
The RTX 4090 suits workloads that require the 24 GB VRAM capacity and the 1008 GB per second bandwidth together with 165.2 TFLOPS dense FP16. Users running large batch inference or training steps benefit from these numbers over the corresponding RTX A4000 specifications.
When to Choose the RTX A4000
The RTX A4000 fits deployments where the 140 W TDP must remain the primary constraint and where 19.2 TFLOPS FP32 meets the required throughput. Its lower power draw supports denser rack configurations than the 450 W TDP of the RTX 4090.
Use Cases
The RTX 4090 supplies 24 GB VRAM and 1008 GB per second bandwidth that exceed the RTX A4000 limits for large model training runs.
The RTX 4090 provides 165.2 TFLOPS dense FP16 and 330.4 TFLOPS FP16 with sparsity that surpass the RTX A4000 sparse FP16 value of 153.4 TFLOPS.
The RTX 4090 24 GB VRAM capacity and 82.6 TFLOPS FP32 enable larger fine-tuning batches than the RTX A4000 16 to 20 GB VRAM and 19.2 TFLOPS FP32.
The RTX 4090 memory bandwidth of 1008 GB per second supports higher resolution image generation workloads compared with the 448 GB per second on the RTX A4000.
The RTX A4000 140 W TDP may suit power constrained scientific nodes while the RTX 4090 82.6 TFLOPS FP32 offers higher throughput when power limits allow.
Frequently Asked Questions
What is the FP32 performance difference between the RTX 4090 and the RTX A4000?▾
The RTX 4090 lists 82.6 TFLOPS in FP32. The RTX A4000 lists 19.2 TFLOPS in FP32. This produces a ratio of roughly four times higher FP32 throughput on the RTX 4090.
Which GPU offers higher memory bandwidth?▾
The RTX 4090 reaches 1008 GB per second. The RTX A4000 reaches 448 GB per second. The bandwidth advantage on the RTX 4090 is more than double the RTX A4000 figure.
What are the TDP values for each card?▾
The RTX 4090 carries a 450 W TDP. The RTX A4000 carries a 140 W TDP. The RTX A4000 therefore draws less than one third the power of the RTX 4090.
Can the RTX A4000 run the same FP16 workloads as the RTX 4090?▾
The RTX 4090 supplies both 165.2 TFLOPS dense FP16 and 330.4 TFLOPS FP16 with sparsity. The RTX A4000 publishes only 153.4 TFLOPS FP16 with sparsity. Direct dense FP16 comparisons are not possible from the published RTX A4000 data.
Which is cheaper to rent, the RTX 4090 or the RTX A4000?▾
Cloud rental prices for both the RTX 4090 and RTX A4000 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 RTX 4090 have compared to the RTX A4000?▾
The RTX 4090 has 24 GB of GDDR6X memory. The RTX A4000 has 16 to 20 GB of GDDR6 memory.
Can I find RTX 4090 and RTX A4000 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 RTX 4090 and the RTX A4000?▾
The RTX 4090 uses the Ada Lovelace architecture (2022) while the RTX A4000 uses Ampere (2021). The RTX 4090 has 24 GB of GDDR6X at 1,008 GB/s; the RTX A4000 has 16-20 GB of GDDR6 at 448 GB/s, so the RTX 4090 has 2.3x the memory bandwidth of the RTX A4000.
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 RTX 4090 and the RTX A4000. 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 RTX 4090Every current offer by provider, daily price history and a price alert.
- Rent RTX A4000Every 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.