Specifications Compared
| Spec | B300 | RTX 3090 |
|---|---|---|
| TDP | 1400W | 350W |
| VRAM | 262-288 GB | 24 GB |
| CUDA Cores | Not published | 10,496 |
| FP4 (dense) | 13,500 TFLOPS | Not published |
| FP8 (dense) | 4,500 TFLOPS | Not published |
| Memory Type | HBM3e | GDDR6X |
| Architecture | Blackwell Ultra | Ampere |
| FP16 (dense) | 2,250 TFLOPS | 71 TFLOPS |
| Form Factors | SXM6 | PCIe |
| INT8 (dense) | 187.5 TOPS | 284 TOPS |
| Interconnect | NVLink, PCIe 6.0, InfiniBand | NVLink, PCIe 4.0 |
| Tensor Cores | Not published | 328 |
| FP32 Performance | 75 TFLOPS | 35.6 TFLOPS |
| FP64 Performance | 1.25 TFLOPS | Not published |
| Memory Bandwidth | 8,000 GB/s | 936 GB/s |
| FP4 (with sparsity) | 18,000 TFLOPS | Not published |
| FP8 (with sparsity) | 9,000 TFLOPS | Not published |
| FP16 (with sparsity) | 4,500 TFLOPS | 142 TFLOPS |
| INT8 (with sparsity) | 375 TOPS | 568 TOPS |
Performance Analysis
Dense FP16 performance reaches 2250 TFLOPS on the B300 and 71 TFLOPS on the RTX 3090. Training workloads therefore complete iterations more rapidly on the B300 because its dense FP16 rating of 2250 TFLOPS exceeds the RTX 3090 dense FP16 rating of 71 TFLOPS. Inference workloads follow the same pattern when both GPUs operate in dense FP16 mode without sparsity.
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.
B300
1 provider in stock, 2 offers (cheapest per provider shown). All B300 offers, price history and alerts
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When to Choose the B300
The B300 serves workloads that need memory capacity between 262 and 288 GB of HBM3e together with 8000 GB/s bandwidth. Tasks that utilize 2250 TFLOPS dense FP16 or 4500 TFLOPS with sparsity align with the B300 specifications in SXM6 form factor.
When to Choose the RTX 3090
The RTX 3090 serves workloads constrained to 350W TDP and PCIe form factor. Tasks that fit within 24 GB VRAM and operate at 71 TFLOPS dense FP16 align with the RTX 3090 specifications.
Use Cases
The B300 supplies 2250 TFLOPS dense FP16 and 262 to 288 GB memory that exceed the RTX 3090 ratings.
The B300 supplies 2250 TFLOPS dense FP16 and 8000 GB/s bandwidth that exceed the RTX 3090 ratings.
The B300 supplies 2250 TFLOPS dense FP16 and 262 to 288 GB memory that exceed the RTX 3090 ratings.
The RTX 3090 supplies 24 GB VRAM and 350W TDP that suffice for workloads within those limits.
The B300 supplies 75 TFLOPS FP32 that exceeds the RTX 3090 rating of 35.6 TFLOPS.
Frequently Asked Questions
What is the dense FP16 rating of the B300 versus the RTX 3090?▾
The B300 reaches 2250 TFLOPS in dense FP16. The RTX 3090 reaches 71 TFLOPS in dense FP16.
What TDP values distinguish the B300 from the RTX 3090?▾
The B300 lists a TDP of 1400W. The RTX 3090 lists a TDP of 350W.
Does the RTX 3090 publish an FP8 rating?▾
The RTX 3090 does not publish an FP8 rating. The B300 publishes 4500 TFLOPS dense FP8.
What FP32 performance separates the two GPUs?▾
The B300 reaches 75 TFLOPS in FP32. The RTX 3090 reaches 35.6 TFLOPS in FP32.
Which is cheaper to rent, the B300 or the RTX 3090?▾
Cloud rental prices for both the B300 and RTX 3090 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 B300 have compared to the RTX 3090?▾
The B300 has 262 to 288 GB of HBM3e memory. The RTX 3090 has 24 GB of GDDR6X memory.
Can I find B300 and RTX 3090 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 B300 and the RTX 3090?▾
The B300 uses the Blackwell Ultra architecture (2025) while the RTX 3090 uses Ampere (2020). The B300 delivers 31.7x the dense FP16 throughput (2,250 vs 71 TFLOPS, both without sparsity) and 8.5x the memory bandwidth of the RTX 3090.
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 B300 and the RTX 3090. 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 B300Every current offer by provider, daily price history and a price alert.
- Rent RTX 3090Every 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.