Specifications Compared
| Spec | B300 | MI250X |
|---|---|---|
| TDP | 1400W | 560W |
| VRAM | 262-288 GB | 128 GB |
| FP4 (dense) | 13,500 TFLOPS | Not published |
| FP8 (dense) | 4,500 TFLOPS | Not published |
| Memory Type | HBM3e | HBM2e |
| Architecture | Blackwell Ultra | CDNA 2 |
| FP16 (dense) | 2,250 TFLOPS | 383 TFLOPS |
| Form Factors | SXM6 | OAM |
| INT8 (dense) | 187.5 TOPS | 383 TOPS |
| Interconnect | NVLink, PCIe 6.0, InfiniBand | Infinity Fabric, PCIe 4.0 |
| FP32 Performance | 75 TFLOPS | 47.9 TFLOPS |
| FP64 Performance | 1.25 TFLOPS | 47.9 TFLOPS |
| Memory Bandwidth | 8,000 GB/s | 3,277 GB/s |
| FP4 (with sparsity) | 18,000 TFLOPS | Not published |
| FP8 (with sparsity) | 9,000 TFLOPS | Not published |
| FP16 (with sparsity) | 4,500 TFLOPS | Not published |
| INT8 (with sparsity) | 375 TOPS | Not published |
Performance Analysis
Memory bandwidth of 8000 GB/s on the B300 versus 3277 GB/s on the MI250X directly influences sustainable batch sizes during large model training. Larger batches become feasible on the B300 because data movement keeps pace with its 2250 TFLOPS dense FP16 throughput. In contrast the MI250X bandwidth limit constrains batch scaling even though its TDP of 560 W remains lower than the 1400 W TDP of the B300.
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
MI250X
MI250X is not offered on-demand by any provider we track right now. See the MI250X rental page for last-seen listed prices and a price alert.
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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 deployments that require VRAM between 262 GB and 288 GB for models exceeding the 128 GB capacity of the MI250X. Its 8000 GB/s bandwidth and 2250 TFLOPS dense FP16 rating support larger batch sizes and higher throughput in LLM training pipelines.
When to Choose the MI250X
The MI250X fits environments constrained by a 560 W TDP limit where the 1400 W TDP of the B300 exceeds available power budgets. Its 383 TFLOPS dense FP16 and 383 TOPS dense INT8 ratings remain adequate for moderate scale inference tasks that fit within 128 GB VRAM. Teams already invested in Infinity Fabric interconnects may retain the MI250X to avoid migration to NVLink or PCIe 6.0 fabrics.
Use Cases
The B300 supplies 2250 TFLOPS dense FP16 and up to 288 GB VRAM which exceed the 383 TFLOPS dense FP16 and 128 GB VRAM of the MI250X.
The B300 achieves 4500 TFLOPS FP8 dense performance and 8000 GB/s bandwidth allowing larger concurrent batch inference than the MI250X specifications permit.
Higher dense FP16 throughput of 2250 TFLOPS and greater memory capacity on the B300 support efficient parameter updates compared with the MI250X.
The B300 2250 TFLOPS dense FP16 rating and 8000 GB/s bandwidth accelerate diffusion model iterations beyond the MI250X limits.
The B300 delivers 75 TFLOPS FP32 performance which surpasses the 47.9 TFLOPS FP32 performance of the MI250X for precision heavy simulations.
Frequently Asked Questions
What is the memory bandwidth difference between these GPUs?▾
The B300 reaches 8000 GB/s bandwidth whereas the MI250X reaches 3277 GB/s bandwidth.
Which GPU offers higher dense FP16 performance?▾
The B300 lists 2250 TFLOPS dense FP16 performance while the MI250X lists 383 TFLOPS dense FP16 performance.
How do the TDP ratings compare?▾
The B300 carries a 1400 W TDP rating and the MI250X carries a 560 W TDP rating.
What FP32 performance do the GPUs deliver?▾
The B300 provides 75 TFLOPS FP32 performance and the MI250X provides 47.9 TFLOPS FP32 performance.
Which interconnects are supported on each device?▾
The B300 supports NVLink, PCIe 6.0 and InfiniBand while the MI250X supports Infinity Fabric and PCIe 4.0.
Which is cheaper to rent, the B300 or the MI250X?▾
Cloud rental prices for both the B300 and MI250X 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 MI250X?▾
The B300 has 262 to 288 GB of HBM3e memory. The MI250X has 128 GB of HBM2e memory.
Can I find B300 and MI250X 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 MI250X?▾
The B300 uses the Blackwell Ultra architecture (2025) while the MI250X uses CDNA 2 (2021). The B300 delivers 5.9x the dense FP16 throughput (2,250 vs 383 TFLOPS, both without sparsity) and 2.4x the memory bandwidth of the MI250X.
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 MI250X. 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 MI250XEvery 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.