L40S vs A100

Ada LovelacevsAmpereUpdated 40 days ago

The A100 emerges as the winner for most common AI training and inference use cases. Its 2039 GB/s bandwidth and NVLink support outperform L40S in scaling large models, paired with lower pricing from $0.13 per hour across 34 offers. While L40S excels in FP32 at 91 TFLOPS, bandwidth dominance tips the scale for throughput-critical workloads.

L40S from $0.55/hrA100 from $0.73/hr

Specifications Compared

SpecL40SA100
TDP350W400W
VRAM48 GB40-80 GB
CUDA Cores18,1766,912
Memory TypeGDDR6XHBM2e
ArchitectureAda LovelaceAmpere
Form FactorsPCIeSXM4, PCIe
InterconnectPCIe 4.0NVLink, PCIe 4.0, InfiniBand
Tensor Cores568432
FP8 Performance724 TFLOPS
FP16 Performance362 TFLOPS312 TFLOPS
FP32 Performance91 TFLOPS19.5 TFLOPS
FP64 Performance1.4 TFLOPS9.7 TFLOPS
INT8 Performance724 TOPS624 TOPS
Memory Bandwidth864 GB/s2,039 GB/s

Performance Analysis

Performance gaps between the L40S and A100 center on precision formats critical for AI. The L40S delivers 362 TFLOPS in FP16 and 91 TFLOPS in FP32, surpassing the A100's 312 TFLOPS FP16 and 19.5 TFLOPS FP32: this favors L40S for FP32-dominant tasks like scientific simulations, while FP16 edges aid mixed-precision training.

Memory bandwidth reveals a stark divide: the A100's 2039 GB/s HBM2e dwarfs the L40S's 864 GB/s GDDR6X, enabling larger batch sizes in training and inference for models like LLMs. Higher bandwidth reduces data bottlenecks, allowing the A100 to process bigger datasets without stalling compute units.

FP8 capability on the L40S at 724 TFLOPS accelerates quantized inference, cutting latency for deployment. Power draw differs at 350W for L40S versus 400W for A100, impacting density in clusters. Interconnects favor A100 with NVLink alongside PCIe 4.0, boosting multi-GPU scaling over L40S's PCIe 4.0 alone.

Live Cloud Pricing

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

L40S

ProviderGPU ModelVRAMHost SpecsRegionPriceStatusAction
TensorDock
TensorDock
NVIDIA L40S
48GB VRAM
$0.55/GPU/hr
Available
RunPod
RunPod
NVIDIA L40S
48GB VRAM
$0.86/GPU/hr
Massed Compute
Massed Compute
4×NVIDIA L40S
48GB VRAM
$0.88/GPU/hr
$3.52/hr total (4×)
Available
Massed Compute
Massed Compute
2×NVIDIA L40S
48GB VRAM
$0.88/GPU/hr
$1.76/hr total (2×)
Available
Massed Compute
Massed Compute
NVIDIA L40S
48GB VRAM
$0.88/GPU/hr
Available

A100

ProviderGPU ModelVRAMHost SpecsRegionPriceStatusAction
Vast.ai
Vast.ai
2×NVIDIA A100 SXM4 80GB
80GB VRAM
$0.73/GPU/hr
$1.47/hr total (2×)
Available
Vast.ai
Vast.ai
2×NVIDIA A100 SXM4 80GB
80GB VRAM
$0.73/GPU/hr
$1.47/hr total (2×)
Available
LeaderGPU
LeaderGPU
8×NVIDIA A100 PCIe 80GB
80GB VRAM
$0.90/GPU/hr
$7.20/hr total (8×)
Available
Vast.ai
Vast.ai
2×NVIDIA A100 SXM4 80GB
80GB VRAM
$1.00/GPU/hr
$2.00/hr total (2×)
Available
Denvr
Denvr
4×NVIDIA A100 PCIe 80GB
80GB VRAM
$1.15/GPU/hr
$4.60/hr total (4×)

Compare real-time pricing across 25+ providers

When to Choose the L40S

Opt for the L40S in workloads demanding high FP32 throughput: its 91 TFLOPS crushes the A100's 19.5 TFLOPS for graphics rendering or simulations. The 2023 Ada Lovelace architecture with 724 TFLOPS FP8 suits modern quantized inference, and 48 GB GDDR6X handles diverse models efficiently at 350W TDP.

PCIe form factor simplifies single-node deployments without NVLink complexity, ideal for cost-conscious users despite $1.65 per hour starting price.

When to Choose the A100

Choose the A100 for bandwidth-intensive AI training: 2039 GB/s supports massive batch sizes versus L40S's 864 GB/s, accelerating LLM convergence. NVLink and InfiniBand enable superior multi-GPU scaling over PCIe-only L40S.

Abundant supply at $0.13 per hour from 34 offers makes it economical for large-scale deployments, with up to 80 GB HBM2e VRAM fitting enormous models.

Use Cases

LLM Training
A100

A100's 2039 GB/s bandwidth enables larger batch sizes critical for LLM training convergence. NVLink scaling outperforms L40S PCIe in multi-GPU setups.

LLM Inference
L40S

L40S FP8 at 724 TFLOPS accelerates quantized serving. Its 362 TFLOPS FP16 edges A100's 312 TFLOPS for low-latency responses.

Fine-tuning
Either

L40S 91 TFLOPS FP32 suits parameter-efficient methods, while A100 2039 GB/s handles data-heavy fine-tuning. Choice depends on model scale and budget.

Stable Diffusion
L40S

L40S Ada architecture with 48 GB VRAM and 362 TFLOPS FP16 optimizes diffusion model generation. Higher FP32 at 91 TFLOPS aids rendering fidelity.

Scientific Computing
L40S

L40S 91 TFLOPS FP32 vastly exceeds A100's 19.5 TFLOPS for simulations. Lower 350W TDP supports dense compute clusters.

Frequently Asked Questions

Which GPU has higher FP32 performance?

The L40S achieves 91 TFLOPS FP32, far exceeding the A100's 19.5 TFLOPS. This gap benefits FP32-heavy tasks like simulations. FP16 remains close at 362 TFLOPS for L40S versus 312 TFLOPS for A100.

How does memory bandwidth compare?

A100 offers 2039 GB/s with HBM2e, over twice the L40S 864 GB/s GDDR6X. Higher bandwidth supports larger batches in training. VRAM is 40-80 GB for A100 against 48 GB for L40S.

What are the current cloud prices?

L40S starts at $1.65 per hour, averaging $1.66 across three offers. A100 begins at $0.13 per hour, averaging $1.33 across 34 offers. Availability favors A100 significantly.

Which has better interconnects?

A100 supports NVLink, PCIe 4.0, and InfiniBand for multi-GPU scaling. L40S limits to PCIe 4.0. This makes A100 superior for clusters.

What is the TDP difference?

L40S draws 350W, lower than A100's 400W. This aids power-efficient deployments. Form factors include PCIe for both, with A100 adding SXM4.

Does L40S support FP8?

L40S provides 724 TFLOPS FP8 for quantized inference, unavailable on A100. This leverages Ada Lovelace advances. FP16 is 362 TFLOPS on L40S.

Which is cheaper to rent, the L40S or the A100?

Cloud rental prices for both the L40S and A100 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 L40S have compared to the A100?

The L40S has 48 GB of GDDR6X memory. The A100 has 40 to 80 GB of HBM2e memory.

Can I find L40S and A100 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 L40S and the A100?

The L40S uses the Ada Lovelace architecture (2023) while the A100 uses Ampere (2020). The A100 delivers 0.9x the FP16 throughput and 2.4x the memory bandwidth of the L40S.

L40S vs A100: Inference vs Training Compared | GPUPerHour