RTX 4090 vs RTX A5000: Specs, VRAM & Price
Short answer: choose the RTX 4090 when your workload uses FP8 quantized inference or serving. Choose the RTX A5000 when your workload is BF16/FP32-only and FP8 buys you nothing.
Both the RTX 4090 and the RTX A5000 ship with 24 GB of VRAM.
You can rent both by the hour, no purchase required. RTX 4090 from $0.374/GPU/hr; RTX A5000 from $0.176/GPU/hr. The RTX A5000 is 53% cheaper at the entry rate.
RTX 4090
Good for inference and light fine-tuning workloads
RTX A5000
Good for inference and small-scale training workloads
Last updated: 2026-10-10 21:04:44 UTCRefreshes hourly
Specs side by side
| Spec | RTX 4090 | RTX A5000 |
|---|---|---|
| VRAM | 24 GB | 24 GB |
| Memory bandwidth | 1,008 GB/s | 768 GB/s |
| Architecture | Ada Lovelace | Ampere |
| Compute capability | 8.9 | 8.6 |
| Precisions in hardware | FP32, FP16, BF16, FP8, INT4 | FP32, FP16, BF16, INT4 |
| NVLink / multi-GPU interconnect | – | NVLink, 112.5 GB/s bidirectional |
| Max board power (TDP) | 450W | 230W |
| Form factor | PCIe 4.0 x16 | – |
| Regions | 3 | 2 |
On-demand price
| Rate | RTX 4090 | RTX A5000 |
|---|---|---|
| Lowest per GPU/hr | $0.761/GPU/hr | $0.297/GPU/hr |
Which is better for AI: RTX 4090 or RTX A5000?
Choose the RTX 4090 when your workload uses FP8 quantized inference or serving. Choose the RTX A5000 when your workload is BF16/FP32-only and FP8 buys you nothing.
RTX 4090 vs RTX A5000: common questions
Is the RTX 4090 or the RTX A5000 better for AI?
Short answer: choose the RTX 4090 when your workload uses FP8 quantized inference or serving. Choose the RTX A5000 when your workload is BF16/FP32-only and FP8 buys you nothing.
Is the RTX 4090 or the RTX A5000 cheaper to rent?
On Aquanode's live marketplace the RTX 4090 starts at $0.374/GPU/hr (median $0.767/GPU/hr) and the RTX A5000 starts at $0.176/GPU/hr (median $0.295/GPU/hr). The RTX A5000 is the cheaper of the two at the entry rate, by 53%.
What is the difference between the RTX 4090 and the RTX A5000?
Both cards report 24 GB of VRAM; the RTX 4090 is an Ada Lovelace part and the RTX A5000 is Ampere (compute capability 8.9 vs 8.6); only the RTX 4090 supports FP8 compute. On price, the RTX 4090 lists from $0.374/GPU/hr and the RTX A5000 from $0.176/GPU/hr.
How widely available are the RTX 4090 and the RTX A5000?
The RTX 4090 is listed in 3 regions and the RTX A5000 in 2 regions right now.
How much does 1,000 GPU-hours cost on the RTX 4090 vs the RTX A5000?
At the lowest rates listed today, 1,000 GPU-hours costs $374 on the RTX 4090 and $176 on the RTX A5000, a difference of $198 for the same runtime. Rates are per GPU per hour and update hourly.
How much VRAM does the RTX 4090 have compared to the RTX A5000?
Both the RTX 4090 and the RTX A5000 ship with 24 GB of VRAM.
Does the RTX 4090 or the RTX A5000 support NVLink?
The RTX A5000 supports NVLink, 112.5 GB/s bidirectional; the RTX 4090 has no dedicated GPU-to-GPU interconnect.
How this comparison is calculated
Every price is normalized to a per-GPU hourly rate using the same pipeline as every other pricing surface on Aquanode, and only the cheapest qualifying offer per provider is shown. A dash means that provider does not currently list that GPU.
Architecture, compute capability and supported precisions come from each vendor's published datasheet for that generation, not from the marketplace feed. This page regenerates at most once per hour.
Memory bandwidth, tensor TFLOPS, NVLink/interconnect and max board power are the same verified-from-datasheet figures shown on each model's own RTX 4090 page and RTX A5000 page, which link the primary vendor source for that model. A dash here means Aquanode hasn't verified that figure from a primary source yet, never a guess.
Go further
Check what fits in each card's memory with the RTX 4090 VRAM calculator and the RTX A5000 VRAM calculator, or browse every model by generation in the GPU index.
More RTX 4090 comparisons
More RTX A5000 comparisons
Related reading: RTX 4090 pricing and specs, RTX 4090 for AI, RTX 5090 vs RTX 4090, and The best GPUs for AI, ranked.
