B300 SXM6 vs H100 PCIe

Blackwell UltravsHopperUpdated 35 days ago

The NVIDIA B300 SXM6 emerges as the winner for dominant AI use cases like LLM training and inference. Its 288 GB VRAM, 12000 GB/s bandwidth, and 2250 TFLOPS FP16 deliver unmatched scale and speed over the H100's 80-94 GB, 3350 GB/s, and 1979 TFLOPS, despite higher $6.44 per hour average cost.

B300 SXM6 from $7.39/hrH100 PCIe from $1.90/hr

Specifications Compared

SpecB300H100
TDP1200W700W
VRAM288 GB80-94 GB
Memory TypeHBM3eHBM3
ArchitectureBlackwell UltraHopper
Form FactorsSXMSXM5, PCIe, NVL
InterconnectNVSwitch, NVLinkNVLink, PCIe 5.0, InfiniBand
FP8 Performance4,500 TFLOPS3,958 TFLOPS
FP16 Performance2,250 TFLOPS1,979 TFLOPS
FP32 Performance90 TFLOPS67 TFLOPS
FP64 Performance45 TFLOPS34 TFLOPS
INT8 Performance4,500 TOPS3,958 TOPS
Memory Bandwidth12,000 GB/s3,350 GB/s

Performance Analysis

The B300's superior FP16 performance of 2250 TFLOPS over the H100's 1979 TFLOPS accelerates inference tasks, while its 90 TFLOPS FP32 exceeds the H100's 67 TFLOPS for faster model training. FP8 throughput reaches 4500 TFLOPS on the B300 versus 3958 TFLOPS on the H100, benefiting quantized inference in large language models. These deltas translate to reduced training times: for instance, FP32 gains support quicker convergence in scientific simulations. Memory capacity stands out: 288 GB HBM3e on the B300 permits batch sizes impossible on the H100's 80-94 GB HBM3, avoiding out-of-memory errors in LLM fine-tuning. Bandwidth of 12000 GB/s on the B300 minimizes data transfer bottlenecks compared to 3350 GB/s on the H100, enabling larger effective batch sizes and higher throughput in memory-bound workloads. The B300's 1200W TDP demands more cooling than the H100's 700W, impacting deployment in power-constrained environments.

Live Cloud Pricing

Real-time prices from 25+ providers. Updated every 60 seconds.

B300 SXM6

ProviderGPU ModelVRAMHost SpecsRegionPriceStatusAction
RunPod
RunPod
NVIDIA B300 SXM6
262GB VRAM
$7.39/GPU/hr
VERDA
VERDA
NVIDIA B300 SXM6
262GB VRAM
$7.50/GPU/hr
Available
VERDA
VERDA
2×NVIDIA B300 SXM6
262GB VRAM
$7.50/GPU/hr
$15.00/hr total (2×)
Available
VERDA
VERDA
8×NVIDIA B300 SXM6
262GB VRAM
$7.50/GPU/hr
$60.00/hr total (8×)
Available
Scaleway
Scaleway
8×NVIDIA B300 SXM6
262GB VRAM
$8.73/GPU/hr
$69.84/hr total (8×)
Available

H100 PCIe

ProviderGPU ModelVRAMHost SpecsRegionPriceStatusAction
Hyperstack
Hyperstack
4×NVIDIA H100 PCIe
80GB VRAM
$1.90/GPU/hr
$7.60/hr total (4×)
Available
Hyperstack
Hyperstack
2×NVIDIA H100 PCIe
80GB VRAM
$1.90/GPU/hr
$3.80/hr total (2×)
Available
Hyperstack
Hyperstack
8×NVIDIA H100 PCIe
80GB VRAM
$1.90/GPU/hr
$15.20/hr total (8×)
Available
Hyperstack
Hyperstack
NVIDIA H100 PCIe
80GB VRAM
$1.90/GPU/hr
Available
Hyperstack
Hyperstack
8×NVIDIA H100 PCIe
80GB VRAM
$1.95/GPU/hr
$15.60/hr total (8×)
Available

Compare real-time pricing across 25+ providers

When to Choose the B300 SXM6

Opt for the NVIDIA B300 SXM6 in scenarios demanding extreme scale, such as training trillion-parameter LLMs where 288 GB HBM3e VRAM and 12000 GB/s bandwidth prevent memory limitations. Its 2250 TFLOPS FP16 and 4500 TFLOPS FP8 excel in inference for massive models, justifying $2.45 per hour starting pricing for future-proof investments. NVSwitch and NVLink interconnects enhance multi-GPU scaling in data centers.

When to Choose the H100 PCIe

Select the NVIDIA H100 PCIe for cost-effective deployments with mature software support, available from $1.25 per hour across 21 offers. Its 700W TDP suits edge or power-limited setups, while 1979 TFLOPS FP16 handles most current inference needs without excess capacity. PCIe 5.0 and InfiniBand provide flexible interconnects for varied clusters.

Use Cases

LLM Training
B300 SXM6

The B300's 288 GB HBM3e VRAM and 90 TFLOPS FP32 enable training of models too large for the H100's 80-94 GB and 67 TFLOPS.

LLM Inference
B300 SXM6

B300's 4500 TFLOPS FP8 and 12000 GB/s bandwidth support higher throughput for massive models compared to H100's 3958 TFLOPS and 3350 GB/s.

Fine-tuning
B300 SXM6

288 GB VRAM on B300 accommodates larger batch sizes during fine-tuning, reducing iterations versus H100's 80-94 GB limit.

Stable Diffusion
Either

H100's 1979 TFLOPS FP16 suffices for most image generation at lower $1.25 per hour cost, but B300's 2250 TFLOPS accelerates complex workflows.

Scientific Computing
B300 SXM6

B300's 90 TFLOPS FP32 and 12000 GB/s bandwidth outperform H100's 67 TFLOPS and 3350 GB/s in memory-intensive simulations.

Frequently Asked Questions

Which GPU has more VRAM: B300 or H100?

The B300 provides 288 GB HBM3e VRAM, far exceeding the H100's 80-94 GB HBM3. This allows the B300 to handle significantly larger models without memory constraints.

How do B300 and H100 compare in memory bandwidth?

B300 achieves 12000 GB/s, more than triple the H100's 3350 GB/s. Higher bandwidth on B300 reduces bottlenecks in data-heavy AI tasks.

What is the FP16 performance difference between B300 and H100?

B300 delivers 2250 TFLOPS FP16 versus H100's 1979 TFLOPS. This edge benefits inference workloads on the B300.

Which is cheaper in the cloud: B300 SXM6 or H100 PCIe?

H100 PCIe starts at $1.25 per hour with an average of $2.65 across 21 offers, cheaper than B300 SXM6's $2.45 starting and $6.44 average over 7 offers.

What are the TDP ratings for B300 and H100?

B300 requires 1200W TDP, higher than H100's 700W. H100 suits lower-power environments better.

Does B300 support better interconnects than H100?

B300 uses NVSwitch and NVLink, optimized for multi-GPU scaling. H100 offers NVLink, PCIe 5.0, and InfiniBand for broader compatibility.

Which is cheaper to rent, the B300 or the H100?

Cloud rental prices for both the B300 and H100 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 H100?

The B300 has 288 GB of HBM3e memory. The H100 has 80 to 94 GB of HBM3 memory.

Can I find B300 and H100 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 H100?

The B300 uses the Blackwell Ultra architecture (2025) while the H100 uses Hopper (2022). The B300 delivers 1.1x the FP16 throughput and 3.6x the memory bandwidth of the H100.

B300 SXM6 vs H100 PCIe: 288GB HBM3e vs 94GB HBM3 | GPUPerHour