Specifications Compared
| Spec | GB300 | MI300X |
|---|---|---|
| TDP | 1400W | 750W |
| VRAM | 262-288 GB | 192 GB |
| FP4 (dense) | 13,500 TFLOPS | Not published |
| FP8 (dense) | 4,500 TFLOPS | 2,614.9 TFLOPS |
| Memory Type | HBM3e | HBM3 |
| Architecture | Blackwell Ultra | CDNA 3 |
| FP16 (dense) | 2,250 TFLOPS | 1,307.4 TFLOPS |
| Form Factors | SXM6 | OAM |
| INT8 (dense) | 187.5 TOPS | 2,614.9 TOPS |
| Interconnect | NVLink, PCIe 6.0, InfiniBand | Infinity Fabric, PCIe 5.0 |
| FP32 Performance | 75 TFLOPS | 163.4 TFLOPS |
| FP64 Performance | 1.25 TFLOPS | 81.7 TFLOPS |
| Memory Bandwidth | 8,000 GB/s | 5,300 GB/s |
| FP4 (with sparsity) | 18,000 TFLOPS | Not published |
| FP8 (with sparsity) | 9,000 TFLOPS | 5,229.8 TFLOPS |
| FP16 (with sparsity) | 4,500 TFLOPS | 2,614.9 TFLOPS |
| INT8 (with sparsity) | 375 TOPS | 5,229.8 TOPS |
Performance Analysis
FP32 performance reverses the pattern with the MI300X delivering 163.4 TFLOPS against the GB300 value of 75 TFLOPS. Workloads that remain in dense FP16 or FP8 therefore finish faster on the GB300 while workloads that stay in FP32 finish faster on the MI300X. The GB300 also lists FP4 dense performance at 13500 TFLOPS and FP8 dense performance at 4500 TFLOPS numbers absent from the MI300X specification.
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.
GB300
GB300 is not offered on-demand by any provider we track right now. See the GB300 rental page for last-seen listed prices and a price alert.
MI300X
1 provider in stock, 1 offer. All MI300X offers, price history and alerts
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When to Choose the GB300
The GB300 suits LLM training and inference pipelines that exploit its FP16 dense performance of 2250 TFLOPS or its FP8 dense performance of 4500 TFLOPS. Its 8000 GB/s memory bandwidth further enables larger batch sizes than the 5300 GB/s bandwidth of the alternative.
When to Choose the MI300X
The MI300X suits scientific computing workloads that exploit its FP32 performance of 163.4 TFLOPS. Its TDP of 750W also fits deployments that prioritize lower power draw over the 1400W TDP of the GB300.
Use Cases
The GB300 supplies FP16 dense performance of 2250 TFLOPS and memory bandwidth of 8000 GB/s that together exceed the MI300X values.
The GB300 supplies FP8 dense performance of 4500 TFLOPS and FP16 with sparsity performance of 4500 TFLOPS that together exceed the MI300X values.
The GB300 supplies FP16 dense performance of 2250 TFLOPS together with 262-288 GB HBM3e capacity that together exceed the MI300X values.
The GB300 supplies FP8 dense performance of 4500 TFLOPS and FP4 dense performance of 13500 TFLOPS that together exceed any listed MI300X figures.
The MI300X supplies FP32 performance of 163.4 TFLOPS that exceeds the GB300 value of 75 TFLOPS.
Frequently Asked Questions
What is the memory bandwidth of each GPU?▾
The GB300 reaches 8000 GB/s. The MI300X reaches 5300 GB/s.
What FP16 performance does each GPU list?▾
The GB300 lists FP16 dense performance of 2250 TFLOPS and FP16 with sparsity performance of 4500 TFLOPS. The MI300X lists FP16 dense performance of 1307.4 TFLOPS and FP16 with sparsity performance of 2614.9 TFLOPS.
What FP32 performance does each GPU list?▾
The GB300 lists FP32 performance of 75 TFLOPS. The MI300X lists FP32 performance of 163.4 TFLOPS.
What TDP does each GPU carry?▾
The GB300 carries a TDP of 1400W. The MI300X carries a TDP of 750W.
Which interconnects does each GPU support?▾
The GB300 supports NVLink, PCIe 6.0, and InfiniBand. The MI300X supports Infinity Fabric and PCIe 5.0.
Which is cheaper to rent, the GB300 or the MI300X?▾
Cloud rental prices for both the GB300 and MI300X 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 GB300 have compared to the MI300X?▾
The GB300 has 262 to 288 GB of HBM3e memory. The MI300X has 192 GB of HBM3 memory.
Can I find GB300 and MI300X 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 GB300 and the MI300X?▾
The GB300 uses the Blackwell Ultra architecture (2025) while the MI300X uses CDNA 3 (2023). The GB300 delivers 1.7x the dense FP16 throughput (2,250 vs 1,307.4 TFLOPS, both without sparsity) and 1.5x the memory bandwidth of the MI300X.
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 GB300 and the MI300X. 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 GB300Every current offer by provider, daily price history and a price alert.
- Rent MI300XEvery 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.