NVIDIA B300 SXM 288GB vs NVIDIA GB300 Grace Blackwell Ultra Desktop Superchip 252GB
The GB300 delivers 11% more FP8 throughput than the B300 (5,000 vs 4,500 TFLOPS dense). The B300 counters with 36 GB more memory (288 GB vs 252 GB).
NVIDIA B300 SXM 288GB
Full specs →NVIDIA GB300 Grace Blackwell Ultra Desktop Superchip 252GB
Full specs →Specifications
Performance (TFLOPS)
FLOPS by Precision
What actually differs
Both GPUs launched in 2025: the B300 on Blackwell Ultra and the GB300 on Blackwell Ultra.
Dense throughput for the B300 against the GB300: FP64 1.3 vs 1.3 TFLOPS, FP32 75 vs 80 TFLOPS, FP16 2,250 vs 2,500 TFLOPS, FP8 4,500 vs 5,000 TFLOPS. Sparse figures, where the vendor publishes them, appear under each dense number in the performance table.
Memory is 288 GB against 252 GB, fed at 8.0 TB/s versus 7.1 TB/s. More memory per GPU means larger models fit before you have to shard across cards, which often matters more than raw TFLOPS for inference.
For LLM training and inference, weight the FP8 and FP16 rows and memory capacity most heavily. For scientific and HPC workloads, the FP64 row is the one to read.
Frequently asked questions
Is the B300 faster than the GB300?
At FP8 precision the GB300 reaches 5,000 TFLOPS dense against 4,500 TFLOPS for the B300. The performance table on this page lists every published precision for both GPUs.
Which has more memory, the B300 or the GB300?
The B300 carries 288 GB of VRAM versus 252 GB for the GB300. Memory bandwidth is 8.0 TB/s for the B300 and 7.1 TB/s for the GB300.
Can I rent the B300 or the GB300 in the cloud?
Yes. Live cloud listings tracked by Flopper start at $3.75 per GPU hour. The rental pricing section on this page lists current providers and rates for both GPUs.
Where to Rent
NVIDIA B300 SXM 288GB
| Provider | Instance | Price/GPU-hr | Checked | |
|---|---|---|---|---|
DataCrunch | 1B300.30V (spot) | $3.75 | 3h ago | View → |
Nebius | — | $4.30 | 3h ago | View → |
CoreWeave | nvidia-b300 (spot) | $4.48 | 3h ago | View → |
RunPod | B300 (Community Cloud) | $6.94 | 3h ago | View → |
Hyperstack | — | $7.40 | 3h ago | View → |
DataCrunch | 1B300.30V (on-demand) | $7.50 | 3h ago | View → |
Nebius | — | $7.85 | 3h ago | View → |
RunPod | B300 (Secure Cloud) | $7.89 | 3h ago | View → |
Scaleway | B300-SXM-8-288G | $8.76 | 3h ago | View → |
DigitalOcean | gpu-b300x1-288gb | $11.19 | 3h ago | View → |
DigitalOcean | gpu-b300x8-2304gb | $11.19 | 3h ago | View → |
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