Specifications Compared
| Spec | B300 | RTX A4000 |
|---|---|---|
| TDP | 1400W | 140W |
| VRAM | 262-288 GB | 16-20 GB |
| CUDA Cores | Not published | 6,144 |
| FP4 (dense) | 13,500 TFLOPS | Not published |
| FP8 (dense) | 4,500 TFLOPS | Not published |
| Memory Type | HBM3e | GDDR6 |
| Architecture | Blackwell Ultra | Ampere |
| FP16 (dense) | 2,250 TFLOPS | Not published |
| Form Factors | SXM6 | PCIe |
| INT8 (dense) | 187.5 TOPS | Not published |
| Interconnect | NVLink, PCIe 6.0, InfiniBand | PCIe 4.0 |
| Tensor Cores | Not published | 192 |
| FP32 Performance | 75 TFLOPS | 19.2 TFLOPS |
| FP64 Performance | 1.25 TFLOPS | Not published |
| Memory Bandwidth | 8,000 GB/s | 448 GB/s |
| FP4 (with sparsity) | 18,000 TFLOPS | Not published |
| FP8 (with sparsity) | 9,000 TFLOPS | Not published |
| FP16 (with sparsity) | 4,500 TFLOPS | 153.4 TFLOPS |
| INT8 (with sparsity) | 375 TOPS | Not published |
Performance Analysis
FP16 dense performance of 2250 TFLOPS on the B300 exceeds the FP16 figure with sparsity of 153.4 TFLOPS on the RTX A4000 by a wide margin. The same pattern appears in FP32 where the B300 reaches 75 TFLOPS against 19.2 TFLOPS on the RTX A4000. Memory bandwidth of 8000 GB/s on the B300 supports larger batch sizes than the 448 GB/s available on the RTX A4000. FP16 dense throughput on the B300 enables faster training iterations than FP16 with sparsity on the RTX A4000. FP32 dense execution on the B300 likewise accelerates scientific workloads relative to the RTX A4000.
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
RTX A4000
| Provider | Region | GPUs | Per GPU / hr | Instance / hr | Deploy |
|---|---|---|---|---|---|
| Paperspace | ny2 | 2 | $0.76 | $1.52 | Deploy |
1 provider in stock, 9 offers (cheapest per provider shown). All RTX A4000 offers, price history and alerts
Notify me when B300 drops below a price
One email when the cheapest in-stock on-demand price per GPU-hour falls below your threshold. Cheapest right now: $0.50/GPU-hr.
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When to Choose the B300
The B300 suits LLM training that requires 2250 TFLOPS FP16 dense and 262-288 GB VRAM. Workloads needing 8000 GB/s bandwidth and 75 TFLOPS FP32 also favor the B300 over alternatives with lower specifications.
When to Choose the RTX A4000
The RTX A4000 fits inference tasks that operate within 16-20 GB VRAM and 140W TDP. PCIe form factor deployments benefit from the 19.2 TFLOPS FP32 and 448 GB/s bandwidth of the RTX A4000.
Use Cases
The B300 supplies 2250 TFLOPS FP16 dense and 262-288 GB VRAM that exceed RTX A4000 limits.
FP8 dense at 4500 TFLOPS on the B300 supports higher throughput than the RTX A4000 can achieve.
Memory bandwidth of 8000 GB/s on the B300 permits larger batch sizes than 448 GB/s on the RTX A4000.
The RTX A4000 operates at 140W TDP and fits within 16-20 GB VRAM for lighter image generation.
FP32 performance of 75 TFLOPS on the B300 surpasses the 19.2 TFLOPS of the RTX A4000.
Frequently Asked Questions
What is the memory bandwidth difference between these GPUs?▾
The B300 reaches 8000 GB/s and the RTX A4000 reaches 448 GB/s.
Which GPU offers higher FP16 performance?▾
The B300 delivers 2250 TFLOPS FP16 dense while the RTX A4000 delivers 153.4 TFLOPS FP16 with sparsity.
How do the power requirements compare?▾
The B300 lists 1400W TDP and the RTX A4000 lists 140W TDP.
What interconnect options exist for each card?▾
The B300 supports NVLink and the RTX A4000 supports PCIe 4.0.
Which GPU provides more FP32 throughput?▾
The B300 provides 75 TFLOPS FP32 and the RTX A4000 provides 19.2 TFLOPS FP32.
Which is cheaper to rent, the B300 or the RTX A4000?▾
Cloud rental prices for both the B300 and RTX A4000 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 A4000?▾
The B300 has 262 to 288 GB of HBM3e memory. The RTX A4000 has 16 to 20 GB of GDDR6 memory.
Can I find B300 and RTX A4000 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 A4000?▾
The B300 uses the Blackwell Ultra architecture (2025) while the RTX A4000 uses Ampere (2021). The B300 has 262-288 GB of HBM3e at 8,000 GB/s; the RTX A4000 has 16-20 GB of GDDR6 at 448 GB/s, so the B300 has 17.9x the memory bandwidth of the RTX A4000.
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 A4000. 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 A4000Every 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.