P4 vs RTX 4090: Specs, VRAM & Price
Short answer: choose the RTX 4090 when 24 GB of VRAM is the gating requirement. Choose the P4 when 8 GB is enough for the workload and the lower hourly rate points that way.
The P4 has 8 GB of VRAM; the RTX 4090 has 24 GB.
You can rent both by the hour, no purchase required. P4 from $0.069/GPU/hr; RTX 4090 from $0.374/GPU/hr. The P4 is 81% cheaper at the entry rate.
P4
Good for inference workloads on older-generation hardware
RTX 4090
Good for inference and light fine-tuning workloads
Last updated: 2026-10-10 22:01:32 UTCRefreshes hourly
Specs side by side
| Spec | P4 | RTX 4090 |
|---|---|---|
| VRAM | 8 GB | 24 GB |
| Memory bandwidth | – | 1,008 GB/s |
| Architecture | Pascal | Ada Lovelace |
| Compute capability | 6.1 | 8.9 |
| Precisions in hardware | FP32, FP16 | FP32, FP16, BF16, FP8, INT4 |
| Max board power (TDP) | – | 450W |
| Form factor | PCIe | PCIe 4.0 x16 |
| Regions | 1 | 3 |
On-demand price
| Rate | P4 | RTX 4090 |
|---|---|---|
| Lowest per GPU/hr | $0.069/GPU/hr (cheapest overall) | $0.761/GPU/hr |
Which is better for AI: P4 or RTX 4090?
Choose the RTX 4090 when 24 GB of VRAM is the gating requirement. Choose the P4 when 8 GB is enough for the workload and the lower hourly rate points that way.
P4 vs RTX 4090: common questions
Is the P4 or the RTX 4090 better for AI?
Short answer: choose the RTX 4090 when 24 GB of VRAM is the gating requirement. Choose the P4 when 8 GB is enough for the workload and the lower hourly rate points that way.
Is the P4 or the RTX 4090 cheaper to rent?
On Aquanode's live marketplace the P4 starts at $0.069/GPU/hr (median $0.069/GPU/hr) and the RTX 4090 starts at $0.374/GPU/hr (median $0.766/GPU/hr). The P4 is the cheaper of the two at the entry rate, by 81%.
What is the difference between the P4 and the RTX 4090?
The P4 has 8 GB of VRAM against the RTX 4090's 24 GB; the P4 is a Pascal part and the RTX 4090 is Ada Lovelace (compute capability 6.1 vs 8.9); only the RTX 4090 supports BF16, FP8, INT4 compute. On price, the P4 lists from $0.069/GPU/hr and the RTX 4090 from $0.374/GPU/hr.
How widely available are the P4 and the RTX 4090?
The P4 is listed in 1 region and the RTX 4090 in 3 regions right now.
How much does 1,000 GPU-hours cost on the P4 vs the RTX 4090?
At the lowest rates listed today, 1,000 GPU-hours costs $69 on the P4 and $374 on the RTX 4090, a difference of $305 for the same runtime. Rates are per GPU per hour and update hourly.
How much VRAM does the P4 have compared to the RTX 4090?
The P4 has 8 GB of VRAM; the RTX 4090 has 24 GB.
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 P4 page and RTX 4090 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 P4 VRAM calculator and the RTX 4090 VRAM calculator, or browse every model by generation in the GPU index.
More P4 comparisons
More RTX 4090 comparisons
Related reading: H100 pricing and specs, H100 vs H200, A100 vs H100, H100 and H200: SXM vs NVL vs PCIe, and The best GPUs for AI, ranked.
