B300 vs RTX 3080: Specs, VRAM & Price
Short answer: choose the B300 when 288 GB of VRAM is the gating requirement. Choose the RTX 3080 when 12 GB is enough for the workload and the lower hourly rate points that way.
The B300 has 288 GB of VRAM; the RTX 3080 has 12 GB.
You can rent both by the hour, no purchase required. B300 from $9.89/GPU/hr; RTX 3080 from $0.187/GPU/hr. The RTX 3080 is 98% cheaper at the entry rate.
B300
Good for training and serving frontier-scale LLMs
RTX 3080
Good for inference and small-scale training workloads
Last updated: 2026-10-10 22:00:54 UTCRefreshes hourly
Specs side by side
| Spec | B300 | RTX 3080 |
|---|---|---|
| VRAM | 288 GB | 12 GB |
| Memory bandwidth | – | 760 GB/s |
| Architecture | Blackwell Ultra | Ampere |
| Compute capability | 10.3 | 8.6 |
| Precisions in hardware | FP32, FP16, BF16, FP8, INT4 | FP32, FP16, BF16, INT4 |
| Peak FP16/BF16 tensor TFLOPS | – | 119 TFLOPS |
| Max board power (TDP) | – | 320W |
| Regions | 1 | 1 |
On-demand price
| Rate | B300 | RTX 3080 |
|---|---|---|
| Lowest per GPU/hr | $9.89/GPU/hr | $0.187/GPU/hr (cheapest overall) |
Which is better for AI: B300 or RTX 3080?
Choose the B300 when 288 GB of VRAM is the gating requirement. Choose the RTX 3080 when 12 GB is enough for the workload and the lower hourly rate points that way.
B300 vs RTX 3080: common questions
Is the B300 or the RTX 3080 better for AI?
Short answer: choose the B300 when 288 GB of VRAM is the gating requirement. Choose the RTX 3080 when 12 GB is enough for the workload and the lower hourly rate points that way.
Is the B300 or the RTX 3080 cheaper to rent?
On Aquanode's live marketplace the B300 starts at $9.89/GPU/hr (median $9.89/GPU/hr) and the RTX 3080 starts at $0.187/GPU/hr (median $0.198/GPU/hr). The RTX 3080 is the cheaper of the two at the entry rate, by 98%.
What is the difference between the B300 and the RTX 3080?
The B300 has 288 GB of VRAM against the RTX 3080's 12 GB; the B300 is a Blackwell Ultra part and the RTX 3080 is Ampere (compute capability 10.3 vs 8.6); only the B300 supports FP8 compute. On price, the B300 lists from $9.89/GPU/hr and the RTX 3080 from $0.187/GPU/hr.
How widely available are the B300 and the RTX 3080?
The B300 is listed in 1 region and the RTX 3080 in 1 region right now.
How much does 1,000 GPU-hours cost on the B300 vs the RTX 3080?
At the lowest rates listed today, 1,000 GPU-hours costs $9,889 on the B300 and $187 on the RTX 3080, a difference of $9,702 for the same runtime. Rates are per GPU per hour and update hourly.
How much VRAM does the B300 have compared to the RTX 3080?
The B300 has 288 GB of VRAM; the RTX 3080 has 12 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 B300 page and RTX 3080 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 B300 VRAM calculator and the RTX 3080 VRAM calculator, or browse every model by generation in the GPU index.
More B300 comparisons
More RTX 3080 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.
