MI455X vs B300
The MI455X offers 432GB HBM4 with ROCm, while the B300 (Blackwell Ultra) provides 288GB HBM3E with the CUDA ecosystem. Choose MI455X for maximum per-GPU memory, B300 for ecosystem maturity and availability.
Overview
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AMD MI455X
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Nvidia B300
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| Summary | AMD's CDNA 5 flagship for frontier-scale training and inference in Helios rack systems. | Highest VRAM in the Blackwell lineup for training the largest foundation models. |
| Architecture | CDNA 5 | Blackwell Ultra |
| Memory | 432GB HBM4 | Up to 288 HBM3e |
| Memory Bandwidth | 23,300 GB/s | 8,000 GB/s |
| Performance | 5,030 TFLOPS (FP16) | 9,000 TFLOPS (FP8) |
| Release Date | Unknown | Q4 2025 |
| Performance Segment | High Performance | High Performance |
| Datasheet | Link | Link |
Price comparison
MI455X Pricing
The MI455X is listed by 4 cloud providers, but none offer public on-demand pricing.
How we sort results
Default ranking
Our algorithm weighs five factors to find the most relevant matches for you:
- Price: We blend total hourly price with price-per-GPU to balance affordability and value.
- Specs: We favor offers with higher CPU, RAM, and GPU Memory.
- Billing: We favor on-demand billing for simplicity and flexibility over spot instances, reservations, and custom quotes.
- Location: We blend both datacenter proximity and provider HQ location. Datacenter location matters for latency, while HQ location matters for compliance and support.
- Provider diversity: Each time a provider appears in the list, their subsequent offerings are ranked a little lower, so one provider's offerings don't crowd out the top positions.
Sorting and filtering
Click "View all offerings" to access the full list with sortable columns and filters for billing type, GPU count, vCPUs, and RAM.
Transparency and funding
Ads and sponsors: Any paid placements are fixed at the top and clearly labeled as sponsored content.
Affiliates: Any affiliate links will be indicated to you as well. We may earn a commission if you click them, but this never influences the ranking order.
| Provider | GPUs | Billing | Total/h | |
|---|---|---|---|---|
TensorWave
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1x | Custom Accepting reservations, pricing TBD | Custom | View |
Cirrascale
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1x | Custom Announced for the AI Innovation Cloud, pricing TBD | Custom | View |
Azure
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1x | Custom Custom terms negotiated with the provider. | Custom | View |
Vultr
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1x | Custom Custom terms negotiated with the provider. | Custom | View |
| No offerings matching your filters. | ||||
B300 Pricing
Listings for the B300 reach $17.80/hr, often reflecting a premium for high availability. However, you might be able to find available instances from as low as $0.98/hr per GPU (on-demand).
How we sort results
Default ranking
Our algorithm weighs five factors to find the most relevant matches for you:
- Price: We blend total hourly price with price-per-GPU to balance affordability and value.
- Specs: We favor offers with higher CPU, RAM, and GPU Memory.
- Billing: We favor on-demand billing for simplicity and flexibility over spot instances, reservations, and custom quotes.
- Location: We blend both datacenter proximity and provider HQ location. Datacenter location matters for latency, while HQ location matters for compliance and support.
- Provider diversity: Each time a provider appears in the list, their subsequent offerings are ranked a little lower, so one provider's offerings don't crowd out the top positions.
Sorting and filtering
Click "View all offerings" to access the full list with sortable columns and filters for billing type, GPU count, vCPUs, and RAM.
Transparency and funding
Ads and sponsors: Any paid placements are fixed at the top and clearly labeled as sponsored content.
Affiliates: Any affiliate links will be indicated to you as well. We may earn a commission if you click them, but this never influences the ranking order.
| Provider | GPUs | Billing | Total/h | |
|---|---|---|---|---|
Runpod
Our sponsor
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $6.94 | View |
Nebius
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8x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.85 | View |
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Runpod
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.39 | View |
Hyperstack
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.40 | View |
Lyceum
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.99 | View |
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Runpod
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2x | On-Demand Pay-as-you-go pricing. No term commitments. | $14.78 | View |
Verda
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.50 | View |
DigitalOcean
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1x | Reserved (12mo) Reserved capacity with a 1-year minimum commitment. | $7.94 | View |
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Lyceum
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2x | On-Demand Pay-as-you-go pricing. No term commitments. | $15.98 | View |
Enverge
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $7.50 | View |
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Verda
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2x | On-Demand Pay-as-you-go pricing. No term commitments. | $15.00 | View |
Fal.ai
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1x | On-Demand Pay-as-you-go pricing. No term commitments. | $8.50 | View |
CoreWeave
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8x | Spot Variable spot pricing with potential interruptions. | $35.84 | View |
Impossible Cloud
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8x | Reserved (60mo) Reserved capacity with a 60-month minimum commitment. | $30.88 | View |
Oracle Cloud
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8x | On-Demand Pay-as-you-go pricing. No term commitments. | $120.00 | View |
| No offerings matching your filters. | ||||
Heads up: We do our best to keep these specs & prices accurate. However, cloud costs may fluctuate based on region, usage, and other factors not listed here. These are estimates based on common setups and are for informational purposes only. Always verify current rates & exact specs with the provider before provisioning.
Alternative GPUs
Here's how these GPUs compare against alternatives:
AMD MI455X
vs
AMD MI355X
AMD MI455X
vs
Nvidia GB300
Nvidia B300
vs
Nvidia GB300
Nvidia B300
vs
Nvidia H200
Our data for AMD MI455X was last updated on July 27, 2026, and for Nvidia B300 on July 23, 2026.