RTX 4000 SFF Ada vs RTX A4000: Specs, VRAM & Price
Short answer: choose the RTX 4000 SFF Ada when 20 GB of VRAM is the gating requirement. Choose the RTX A4000 when 16 GB is enough for the workload and the lower hourly rate points that way.
The RTX 4000 SFF Ada has 20 GB of VRAM; the RTX A4000 has 16 GB.
You can rent both by the hour, no purchase required. RTX 4000 SFF Ada from $0.198/GPU/hr; RTX A4000 from $0.167/GPU/hr. The RTX A4000 is 16% cheaper at the entry rate.
RTX 4000 SFF Ada
Good for inference and light fine-tuning workloads
RTX A4000
Good for inference and small-scale training workloads
Last updated: 2026-10-10 22:03:04 UTCRefreshes hourly
Specs side by side
| Spec | RTX 4000 SFF Ada | RTX A4000 |
|---|---|---|
| VRAM | 20 GB | 16 GB |
| Memory bandwidth | – | 448 GB/s |
| Architecture | Ada Lovelace | Ampere |
| Compute capability | 8.9 | 8.6 |
| Precisions in hardware | FP32, FP16, BF16, FP8, INT4 | FP32, FP16, BF16, INT4 |
| Max board power (TDP) | – | 140W |
| Regions | 1 | 2 |
On-demand price
| Rate | RTX 4000 SFF Ada | RTX A4000 |
|---|---|---|
| Lowest per GPU/hr | $0.198/GPU/hr (cheapest overall) | $0.167/GPU/hr |
Which is better for AI: RTX 4000 SFF Ada or RTX A4000?
Choose the RTX 4000 SFF Ada when 20 GB of VRAM is the gating requirement. Choose the RTX A4000 when 16 GB is enough for the workload and the lower hourly rate points that way.
RTX 4000 SFF Ada vs RTX A4000: common questions
Is the RTX 4000 SFF Ada or the RTX A4000 better for AI?
Short answer: choose the RTX 4000 SFF Ada when 20 GB of VRAM is the gating requirement. Choose the RTX A4000 when 16 GB is enough for the workload and the lower hourly rate points that way.
Is the RTX 4000 SFF Ada or the RTX A4000 cheaper to rent?
On Aquanode's live marketplace the RTX 4000 SFF Ada starts at $0.198/GPU/hr (median $0.198/GPU/hr) and the RTX A4000 starts at $0.167/GPU/hr (median $0.187/GPU/hr). The RTX A4000 is the cheaper of the two at the entry rate, by 16%.
What is the difference between the RTX 4000 SFF Ada and the RTX A4000?
The RTX 4000 SFF Ada has 20 GB of VRAM against the RTX A4000's 16 GB; the RTX 4000 SFF Ada is an Ada Lovelace part and the RTX A4000 is Ampere (compute capability 8.9 vs 8.6); only the RTX 4000 SFF Ada supports FP8 compute. On price, the RTX 4000 SFF Ada lists from $0.198/GPU/hr and the RTX A4000 from $0.167/GPU/hr.
How widely available are the RTX 4000 SFF Ada and the RTX A4000?
The RTX 4000 SFF Ada is listed in 1 region and the RTX A4000 in 2 regions right now.
How much does 1,000 GPU-hours cost on the RTX 4000 SFF Ada vs the RTX A4000?
At the lowest rates listed today, 1,000 GPU-hours costs $198 on the RTX 4000 SFF Ada and $167 on the RTX A4000, a difference of $31 for the same runtime. Rates are per GPU per hour and update hourly.
How much VRAM does the RTX 4000 SFF Ada have compared to the RTX A4000?
The RTX 4000 SFF Ada has 20 GB of VRAM; the RTX A4000 has 16 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 RTX 4000 SFF Ada page and RTX A4000 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 4000 SFF Ada VRAM calculator and the RTX A4000 VRAM calculator, or browse every model by generation in the GPU index.
More RTX 4000 SFF Ada comparisons
More RTX A4000 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.
