Specifications Compared
| Spec | RTX 3080 | RTX 4090 |
|---|---|---|
| TDP | 320W | 450W |
| VRAM | 10-12 GB | 24 GB |
| CUDA Cores | 8,704 | 16,384 |
| FP8 (dense) | Not published | 330.3 TFLOPS |
| Memory Type | GDDR6X | GDDR6X |
| Architecture | Ampere | Ada Lovelace |
| FP16 (dense) | 59.5 TFLOPS | 165.2 TFLOPS |
| Form Factors | PCIe | PCIe |
| INT8 (dense) | 238 TOPS | 660.6 TOPS |
| Interconnect | PCIe 4.0 | PCIe 4.0 |
| Tensor Cores | 272 | 512 |
| FP32 Performance | 29.8 TFLOPS | 82.6 TFLOPS |
| FP64 Performance | Not published | 1.3 TFLOPS |
| Memory Bandwidth | 760 GB/s | 1,008 GB/s |
| FP8 (with sparsity) | Not published | 660.6 TFLOPS |
| FP16 (with sparsity) | 119 TFLOPS | 330.4 TFLOPS |
| INT8 (with sparsity) | 476 TOPS | 1,321.2 TOPS |
Performance Analysis
Dense FP16 performance reaches 59.5 TFLOPS on the RTX 3080 and 165.2 TFLOPS on the RTX 4090 while FP16 with sparsity reaches 119 TFLOPS and 330.4 TFLOPS respectively. The ratio of dense FP16 to FP32 equals approximately 2.0 on both GPUs so the higher absolute numbers on the RTX 4090 translate directly into faster matrix operations during training and inference passes. Memory bandwidth of 1008 GB/s on the RTX 4090 exceeds the 760 GB/s on the RTX 3080 by a factor of 1.33 and this difference supports larger batch sizes before memory capacity of 24 GB versus 10 to 12 GB becomes the limiting factor. INT8 dense throughput of 660.6 TOPS versus 238 TOPS follows the same pattern and favors the RTX 4090 when quantized inference dominates the workload.
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 3080
RTX 3080 is not offered on-demand by any provider we track right now. See the RTX 3080 rental page for last-seen listed prices and a price alert.
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When to Choose the RTX 3080
The RTX 3080 suits environments where TDP must stay at or below 320 W and workloads fit within 12 GB VRAM. Its FP32 rating of 29.8 TFLOPS remains adequate for smaller fine tuning jobs that do not require the 82.6 TFLOPS available on the RTX 4090.
When to Choose the RTX 4090
Its INT8 dense rating of 660.6 TOPS further supports faster inference compared with the 238 TOPS of the RTX 3080.
Use Cases
The RTX 4090 delivers FP32 performance of 82.6 TFLOPS compared with 29.8 TFLOPS on the RTX 3080.
Dense FP16 throughput of 165.2 TFLOPS and 24 GB VRAM on the RTX 4090 exceed the 59.5 TFLOPS and 10 to 12 GB on the RTX 3080.
Both GPUs support FP16 with sparsity at 119 TFLOPS and 330.4 TFLOPS so selection depends on model size relative to available VRAM.
Memory bandwidth of 1008 GB/s on the RTX 4090 exceeds 760 GB/s on the RTX 3080 and enables larger image batches.
The RTX 4090 provides FP32 throughput of 82.6 TFLOPS against 29.8 TFLOPS on the RTX 3080 for double precision heavy codes.
Frequently Asked Questions
How does FP32 performance compare between the two GPUs?▾
The RTX 3080 lists 29.8 TFLOPS while the RTX 4090 lists 82.6 TFLOPS for FP32 operations.
Which GPU has higher memory bandwidth?▾
The RTX 4090 reaches 1008 GB/s while the RTX 3080 reaches 760 GB/s.
What are the TDP ratings for the RTX 3080 and RTX 4090?▾
The RTX 3080 has a TDP of 320 W and the RTX 4090 has a TDP of 450 W.
How do the dense INT8 figures differ?▾
Dense INT8 performance measures 238 TOPS on the RTX 3080 and 660.6 TOPS on the RTX 4090.
Do both GPUs use the same interconnect?▾
Both the RTX 3080 and RTX 4090 employ PCIe 4.0 interconnects.
Which is cheaper to rent, the RTX 3080 or the RTX 4090?▾
Cloud rental prices for both the RTX 3080 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 RTX 3080 have compared to the RTX 4090?▾
The RTX 3080 has 10 to 12 GB of GDDR6X memory. The RTX 4090 has 24 GB of GDDR6X memory.
Can I find RTX 3080 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 RTX 3080 and the RTX 4090?▾
The RTX 3080 uses the Ampere architecture (2020) while the RTX 4090 uses Ada Lovelace (2022). The RTX 4090 delivers 2.8x the dense FP16 throughput (165.2 vs 59.5 TFLOPS, both without sparsity) and 1.3x the memory bandwidth of the RTX 3080.
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 3080 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 RTX 3080Every 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.