GB300 SXM6 vs RTX 4080 SUPER

Blackwell UltravsAda LovelaceUpdated 35 days ago

The GB300 SXM6 triumphs for dominant AI use cases like LLM training: 288 GB VRAM and 2250 TFLOPS FP16 enable massive scale unattainable by RTX 4080 SUPER's 16 GB and 48.7 TFLOPS, despite the latter's immediate $0.17 per hour availability.

RTX 4080 SUPER from $0.50/hr

Specifications Compared

SpecGB300RTX-4080
TDP1400W320W
VRAM288 GB16 GB
Memory TypeHBM3eGDDR6X
ArchitectureBlackwell UltraAda Lovelace
Form FactorsSXMPCIe
InterconnectNVSwitch, NVLink
FP8 Performance4,500 TFLOPS
FP16 Performance2,250 TFLOPS48.7 TFLOPS
FP32 Performance90 TFLOPS48.7 TFLOPS
FP64 Performance45 TFLOPS
INT8 Performance4,500 TOPS780 TOPS
Memory Bandwidth12,000 GB/s717 GB/s

Performance Analysis

Compute disparities define capabilities: the GB300 SXM6's 2250 TFLOPS FP16 crushes the RTX 4080 SUPER's 48.7 TFLOPS, slashing training times for neural networks by over 46 times. FP8 at 4500 TFLOPS optimizes inference on quantized models, while FP32's 90 TFLOPS edges out 48.7 TFLOPS for simulation tasks.

Memory transforms real-world use: 288 GB HBM3e versus 16 GB GDDR6X loads full large language models without model parallelism, and 12000 GB/s bandwidth sustains batch sizes 16 times larger, accelerating convergence. RTX 4080 SUPER limits to smaller models or inference with frequent swapping.

Interconnects and power scale deployments: NVLink on GB300 SXM6 enables terascale clusters, but 1400W TDP requires enterprise infrastructure. RTX 4080 SUPER's PCIe and 320W suit edge or multi-GPU via standard slots without specialized cooling.

Live Cloud Pricing

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

RTX 4080 SUPER

ProviderGPU ModelVRAMHost SpecsRegionPriceStatusAction
RunPod
RunPod
NVIDIA GeForce RTX 4080 SUPER
16GB VRAM
$0.50/GPU/hr
RunPod
RunPod
NVIDIA GeForce RTX 4080
16GB VRAM
$0.50/GPU/hr

Compare real-time pricing across 25+ providers

When to Choose the GB300 SXM6

Select the GB300 SXM6 for hyperscale AI: 288 GB VRAM fits trillion-parameter models intact, and 12000 GB/s bandwidth supports enormous batches in training. NVLink interconnects cluster thousands for exascale inference at 4500 TFLOPS FP8.

Datacenters prioritize it over consumer cards for sustained 2250 TFLOPS FP16 in production ML pipelines.

When to Choose the RTX 4080 SUPER

The RTX 4080 SUPER serves cost-sensitive prototyping: cloud pricing from $0.17 per hour enables accessible 48.7 TFLOPS FP16 for fine-tuning or inference on models under 16 GB.

Its 320W TDP and PCIe form factor integrate easily into workstations or small clusters for gaming, Stable Diffusion, or light scientific computing without datacenter overhead.

Use Cases

LLM Training
GB300 SXM6

GB300 SXM6's 288 GB HBM3e VRAM and 2250 TFLOPS FP16 manage trillion-parameter models with large batches. RTX 4080 SUPER's 16 GB limits scale.

LLM Inference
GB300 SXM6

4500 TFLOPS FP8 and 12000 GB/s bandwidth on GB300 SXM6 deliver low-latency serving for huge models. RTX 4080 SUPER bottlenecks at 16 GB.

Fine-tuning
RTX 4080 SUPER

RTX 4080 SUPER's 48.7 TFLOPS FP16 and $0.17 per hour pricing suit parameter-efficient tuning on mid-size models. GB300 SXM6 overkill for sub-16 GB tasks.

Stable Diffusion
RTX 4080 SUPER

16 GB GDDR6X and 48.7 TFLOPS handle image generation efficiently at low cost. GB300 SXM6's 1400W TDP unnecessary.

Scientific Computing
Either

GB300 SXM6's 90 TFLOPS FP32 excels in simulations; RTX 4080 SUPER's 48.7 TFLOPS fits smaller jobs affordably.

Frequently Asked Questions

What is the VRAM capacity of NVIDIA GB300 SXM6 versus RTX 4080 SUPER?

The GB300 SXM6 provides 288 GB HBM3e VRAM, dwarfing the RTX 4080 SUPER's 16 GB GDDR6X. This gap allows GB300 SXM6 to load massive AI models without partitioning.

How do FP16 performance levels compare?

GB300 SXM6 achieves 2250 TFLOPS FP16, over 46 times the RTX 4080 SUPER's 48.7 TFLOPS. This accelerates deep learning training dramatically.

What are the power requirements?

GB300 SXM6 demands 1400W TDP in SXM form factor, while RTX 4080 SUPER uses 320W in PCIe. RTX 4080 SUPER suits lower-power setups.

Is there cloud pricing for these GPUs?

No live offers exist for GB300 SXM6. RTX 4080 SUPER starts at $0.17 per hour, averaging $0.32 per hour across three providers.

What memory bandwidth do they offer?

GB300 SXM6 delivers 12000 GB/s, versus 717 GB/s on RTX 4080 SUPER. Higher bandwidth on GB300 SXM6 supports larger batch sizes in ML.

Which has better interconnects?

GB300 SXM6 features NVSwitch and NVLink for multi-GPU scaling. RTX 4080 SUPER lacks dedicated high-speed interconnects, relying on PCIe.

Which is cheaper to rent, the GB300 or the RTX 4080?

Cloud rental prices for both the GB300 and RTX 4080 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 RTX 4080?

The GB300 has 288 GB of HBM3e memory. The RTX 4080 has 16 GB of GDDR6X memory.

Can I find GB300 and RTX 4080 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 RTX 4080?

The GB300 uses the Blackwell Ultra architecture (2025) while the RTX 4080 uses Ada Lovelace (2022). The GB300 delivers 46.2x the FP16 throughput and 16.7x the memory bandwidth of the RTX 4080.

GB300 SXM6 vs RTX 4080 SUPER: 288GB vs 16GB | GPUPerHour