Specifications Compared
| Spec | A100 | RTX-3090 |
|---|---|---|
| TDP | 400W | 350W |
| VRAM | 40-80 GB | 24 GB |
| CUDA Cores | 6,912 | 10,496 |
| Memory Type | HBM2e | GDDR6X |
| Architecture | Ampere | Ampere |
| Form Factors | SXM4, PCIe | PCIe |
| Interconnect | NVLink, PCIe 4.0, InfiniBand | NVLink |
| Tensor Cores | 432 | 328 |
| FP16 Performance | 312 TFLOPS | 35.6 TFLOPS |
| FP32 Performance | 19.5 TFLOPS | 35.6 TFLOPS |
| FP64 Performance | 9.7 TFLOPS | |
| INT8 Performance | 624 TOPS | |
| Memory Bandwidth | 2,039 GB/s | 936 GB/s |
Performance Analysis
FP16 performance creates the starkest divide for AI workloads: the A100 PCIe 80GB reaches 312 TFLOPS, nearly nine times the RTX 3090 Ti's 35.6 TFLOPS, accelerating matrix multiplications essential for training and inference in half-precision deep learning models. FP32 performance reverses this trend, with the RTX 3090 Ti at 35.6 TFLOPS surpassing the A100's 19.5 TFLOPS, favoring workloads like scientific simulations or rendering that rely on single-precision arithmetic.
Memory constraints shape practical deployment: the A100's 80 GB HBM2e VRAM supports models and batch sizes exceeding the RTX 3090 Ti's 24 GB GDDR6X limit, enabling training of large language models without fragmentation. The A100's 2039 GB/s bandwidth doubles the RTX 3090 Ti's 936 GB/s, minimizing data transfer bottlenecks and sustaining higher throughput during memory-bound operations such as gradient computations with large batches.
Live Cloud Pricing
Real-time prices from 25+ providers. Updated every 60 seconds.
A100 PCIe 80GB
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 Vast.ai | NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 256 vCPU 63GB RAM 2826GB Storage | Slovenia | $0.73/GPU/hr | Available | ||
Vast.ai | 2×NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 256 vCPU 126GB RAM 794GB Storage | Slovenia | $0.73/GPU/hr $1.47/hr total (2×) | Available | ||
 LeaderGPU | 8×NVIDIA A100 PCIe 80GB 80GB VRAM | 80GB | 64 vCPU 384GB RAM 2000GB Storage | Netherlands | $0.90/GPU/hr $7.20/hr total (8×) | Available | ||
Vast.ai | NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 64 vCPU 63GB RAM 646GB Storage | Czechia | $1.07/GPU/hr | Available | ||
 Denvr | 8×NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 128 vCPU 1024GB RAM 15200GB Storage | Virginia | $1.15/GPU/hr $9.20/hr total (8×) |
RTX 3090 Ti
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 TensorDock | NVIDIA GeForce RTX 3090 24GB VRAM | 24GB | 0 vCPU 0GB RAM | Wilmington, Delaware | $0.20/GPU/hr | Available | ||
TensorDock | NVIDIA GeForce RTX 3090 24GB VRAM | 24GB | 0 vCPU 0GB RAM | Dallas, Texas | $0.21/GPU/hr | Available | ||
Vast.ai | 4×NVIDIA GeForce RTX 3090 24GB VRAM | 24GB | 32 vCPU 403GB RAM 104GB Storage | Iceland | $0.25/GPU/hr $1.01/hr total (4×) | Available | ||
Vast.ai | 4×NVIDIA GeForce RTX 3090 24GB VRAM | 24GB | 32 vCPU 252GB RAM 1217GB Storage | Finland | $0.27/GPU/hr $1.07/hr total (4×) | Available | ||
LeaderGPU | 8×NVIDIA GeForce RTX 3090 24GB VRAM | 24GB | 64 vCPU 384GB RAM 2000GB Storage | Netherlands | $0.29/GPU/hr $2.29/hr total (8×) | Available |
When to Choose the A100 PCIe 80GB
Professional AI teams choose the NVIDIA A100 PCIe 80GB for large-scale model training: its 80 GB VRAM loads parameter sets over 70 GB, and 312 TFLOPS FP16 reduces epochs significantly. Datacenter environments leverage 2039 GB/s bandwidth for massive batch sizes, optimizing throughput in multi-GPU setups via NVLink and PCIe 4.0.
When to Choose the RTX 3090 Ti
Cost-sensitive users and small teams opt for the NVIDIA GeForce RTX 3090 Ti: rentals from $0.10 per hour enable affordable prototyping and inference. Its 35.6 TFLOPS FP32 and FP16 performance handles models under 20 GB effectively, suiting gaming-integrated workflows or budget fine-tuning.
Use Cases
LLM training requires over 40 GB VRAM for billion-parameter models; the A100 PCIe 80GB provides 80 GB HBM2e and 312 TFLOPS FP16 for efficient scaling.
High-throughput inference demands large VRAM and bandwidth; A100's 80 GB and 2039 GB/s support bigger batches than RTX 3090 Ti's 24 GB and 936 GB/s.
Fine-tuning mid-sized models fits 24 GB VRAM; RTX 3090 Ti offers $0.10 per hour value, while A100 accelerates with 312 TFLOPS FP16.
Image generation workloads utilize 24 GB GDDR6X effectively; RTX 3090 Ti's 35.6 TFLOPS and $0.25 per hour average suit rapid iterations.
FP32-dominant simulations benefit from RTX 3090 Ti's 35.6 TFLOPS over A100's 19.5 TFLOPS; lower 350W TDP aids dense deployments.
Frequently Asked Questions
What is the VRAM capacity of NVIDIA A100 PCIe 80GB versus RTX 3090 Ti?▾
The A100 PCIe 80GB features 80 GB HBM2e VRAM. The RTX 3090 Ti has 24 GB GDDR6X VRAM. This gap allows the A100 to manage much larger AI models without swapping.
How do cloud rental prices compare for these GPUs?▾
NVIDIA A100 PCIe 80GB pricing starts at $0.89 per hour, averaging $2.06 per hour across 29 offers. NVIDIA GeForce RTX 3090 Ti begins at $0.10 per hour, averaging $0.25 per hour across 5 offers. The RTX provides substantial savings for lighter workloads.
Which GPU has superior FP16 performance?▾
The A100 PCIe 80GB delivers 312 TFLOPS FP16. The RTX 3090 Ti achieves 35.6 TFLOPS FP16. This makes A100 ideal for half-precision AI training.
What are the memory bandwidth differences?▾
A100 PCIe 80GB offers 2039 GB/s bandwidth. RTX 3090 Ti provides 936 GB/s. Higher bandwidth on A100 reduces bottlenecks in large-batch processing.
Which is better for FP32 workloads?▾
RTX 3090 Ti leads with 35.6 TFLOPS FP32 versus A100 PCIe 80GB's 19.5 TFLOPS. It suits scientific computing or rendering tasks. A100 prioritizes tensor core FP16 instead.
What are the TDP ratings?▾
The A100 PCIe 80GB has a 400W TDP. The RTX 3090 Ti operates at 350W TDP. Lower TDP on RTX eases power provisioning in consumer setups.
Which is cheaper to rent, the A100 or the RTX 3090?▾
Cloud rental prices for both the A100 and RTX 3090 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 A100 have compared to the RTX 3090?▾
The A100 has 40 to 80 GB of HBM2e memory. The RTX 3090 has 24 GB of GDDR6X memory.
Can I find A100 and RTX 3090 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 A100 and the RTX 3090?▾
The A100 uses the Ampere architecture (2020) while the RTX 3090 uses Ampere (2020). The A100 delivers 8.8x the FP16 throughput and 2.2x the memory bandwidth of the RTX 3090.