Specifications Compared
| Spec | GB300 SXM6 | RTX 5090 |
|---|---|---|
| TDP | 1400W | 575W |
| VRAM | 288 GB | 32 GB |
| CUDA Cores | Not published | 21,760 |
| FP4 (dense) | 13,500 TFLOPS | 1,676 TFLOPS |
| FP8 (dense) | 4,500 TFLOPS | 419 TFLOPS |
| Memory Type | HBM3e | GDDR7 |
| Architecture | Blackwell Ultra | Blackwell |
| FP16 (dense) | 2,250 TFLOPS | 209.5 TFLOPS |
| Form Factors | SXM6 | PCIe |
| INT8 (dense) | 187.5 TOPS | 838 TOPS |
| Interconnect | NVLink, PCIe 6.0, InfiniBand | PCIe 5.0 |
| Tensor Cores | Not published | 680 |
| FP32 Performance | 75 TFLOPS | 104.8 TFLOPS |
| FP64 Performance | 1.25 TFLOPS | 1.6 TFLOPS |
| Memory Bandwidth | 8,000 GB/s | 1,792 GB/s |
| FP4 (with sparsity) | 18,000 TFLOPS | 3,352 TFLOPS |
| FP8 (with sparsity) | 9,000 TFLOPS | 838 TFLOPS |
| FP16 (with sparsity) | 4,500 TFLOPS | 419 TFLOPS |
| INT8 (with sparsity) | 375 TOPS | 1,676 TOPS |
Performance Analysis
The GB300 SXM6 delivers FP16 dense throughput of 2250 TFLOPS compared with the RTX 5090 delivery of FP16 dense throughput of 209.5 TFLOPS. The same pattern holds for FP16 with sparsity where the GB300 SXM6 reaches 4500 TFLOPS against the RTX 5090 reach of 419 TFLOPS. FP32 figures stand at 75 TFLOPS for the GB300 SXM6 family and 104.8 TFLOPS for the RTX 5090 family. Memory bandwidth of 8000 GB/s on the GB300 SXM6 family versus 1792 GB/s on the RTX 5090 family directly influences maximum batch sizes during training or inference passes. TDP values of 1400W for the GB300 SXM6 family and 575W for the RTX 5090 family set power and cooling boundaries for sustained operation.
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 SXM6
GB300 SXM6 is not offered on-demand by any provider we track right now. See the GB300 SXM6 rental page for last-seen listed prices and a price alert.
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When to Choose the GB300 SXM6
The GB300 SXM6 variant suits deployments that need 288 GB HBM3e capacity together with NVLink connectivity for multi GPU scaling. Workloads that process large models benefit from the 8000 GB/s bandwidth figure shared across the GB300 family.
When to Choose the RTX 5090
The RTX 5090 variant suits compact single node installations that operate within a 575W TDP envelope and rely on 32 GB GDDR7 capacity. PCIe 5.0 connectivity matches standard server slots without additional fabric requirements.
Use Cases
The GB300 SXM6 variant supplies 288 GB HBM3e memory and 8000 GB/s bandwidth that accommodate larger batch sizes than the 32 GB and 1792 GB/s figures of the RTX 5090 variant.
FP8 dense throughput of 4500 TFLOPS on the GB300 SXM6 family supports higher concurrency than the 419 TFLOPS figure on the RTX 5090 family.
The 288 GB capacity on the GB300 SXM6 variant holds full precision checkpoints that exceed the 32 GB limit of the RTX 5090 variant.
The RTX 5090 variant TDP of 575W and PCIe form factor fit consumer workstations while FP16 dense throughput of 209.5 TFLOPS meets typical image generation demands.
FP32 throughput of 75 TFLOPS on the GB300 SXM6 family and 104.8 TFLOPS on the RTX 5090 family both address linear algebra kernels depending on node scale.
Frequently Asked Questions
How do the form factors of the GB300 SXM6 and RTX 5090 variants compare?▾
The GB300 SXM6 variant adopts an SXM6 form factor while the RTX 5090 variant adopts a PCIe form factor. The SXM6 design supports NVLink clusters whereas the PCIe design fits standard slots.
What interconnect options exist for the GB300 SXM6 variant versus the RTX 5090 variant?▾
The GB300 SXM6 variant provides NVLink PCIe 6.0 and InfiniBand while the RTX 5090 variant provides only PCIe 5.0. NVLink enables direct high speed GPU to GPU transfers.
Which variant offers higher FP16 dense throughput?▾
The GB300 SXM6 family lists FP16 dense throughput of 2250 TFLOPS while the RTX 5090 family lists 209.5 TFLOPS. The ratio exceeds ten to one in favor of the GB300 SXM6 family.
How does TDP differ between the GB300 SXM6 family and the RTX 5090 family?▾
The GB300 SXM6 family lists a TDP of 1400W while the RTX 5090 family lists 575W. Power delivery and cooling infrastructure must match these family figures.
What memory bandwidth is shared across each GPU family?▾
The GB300 family shares 8000 GB/s bandwidth while the RTX 5090 family shares 1792 GB/s bandwidth. These figures remain constant for every variant within each family.
Which is cheaper to rent, the GB300 SXM6 or the RTX 5090?▾
Cloud rental prices for both the GB300 SXM6 and RTX 5090 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 SXM6 have compared to the RTX 5090?▾
The GB300 SXM6 has 288 GB of HBM3e memory. The RTX 5090 has 32 GB of GDDR7 memory.
Can I find GB300 SXM6 and RTX 5090 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 SXM6 and the RTX 5090?▾
The GB300 SXM6 uses the Blackwell Ultra architecture (2025) while the RTX 5090 uses Blackwell (2025). The GB300 SXM6 delivers 10.7x the dense FP16 throughput (2,250 vs 209.5 TFLOPS, both without sparsity) and 4.5x the memory bandwidth of the RTX 5090.
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 SXM6 and the RTX 5090. 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 RTX 5090Every 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.