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 defines AI acceleration: the A100 PCIe 40GB achieves 312 TFLOPS versus 35.6 TFLOPS on the RTX 3090 Ti, enabling 8.8 times faster model training and inference in half-precision formats common to deep learning. The FP32 disparity shows 19.5 TFLOPS for A100 PCIe 40GB against 35.6 TFLOPS for RTX 3090 Ti, favoring the latter for graphics rendering or simulations requiring single precision.
Memory systems impact real-world throughput. A100 PCIe 40GB's 2039 GB/s bandwidth and 40 GB HBM2e capacity support larger batch sizes and models exceeding 24 GB, reducing out-of-memory errors in LLM training. RTX 3090 Ti's 936 GB/s and 24 GB GDDR6X limit it to smaller workloads, potentially slowing large-batch processing by over 50 percent due to data bottlenecks.
Power draw aligns closely with TDP ratings of 400W for A100 PCIe 40GB and 350W for RTX 3090 Ti. Multi-GPU scaling benefits from A100 PCIe 40GB's InfiniBand support, outperforming RTX 3090 Ti's NVLink in clusters.
Live Cloud Pricing
Real-time prices from 25+ providers. Updated every 60 seconds.
A100 PCIe 40GB
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 Vast.ai | NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 256 vCPU 63GB RAM 397GB Storage | Slovenia | $0.73/GPU/hr | 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 | 2×NVIDIA A100 SXM4 80GB 80GB VRAM | 80GB | 64 vCPU 126GB RAM 1114GB Storage | Czechia | $1.00/GPU/hr $2.00/hr total (2×) | Available | ||
 Denvr | 4×NVIDIA A100 PCIe 80GB 80GB VRAM | 80GB | 64 vCPU 512GB RAM 7600GB Storage | Virginia | $1.15/GPU/hr $4.60/hr total (4×) | |||
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 153GB 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 1440GB 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 40GB
Select the NVIDIA A100 PCIe 40GB for enterprise-scale AI training where 40 GB VRAM handles massive models. Its 312 TFLOPS FP16 and 2039 GB/s bandwidth enable efficient large-batch processing in multi-GPU setups via NVLink or InfiniBand.
Datacenter deployments favor A100 PCIe 40GB's SXM4 and PCIe forms with 400W TDP tolerance.
When to Choose the RTX 3090 Ti
Choose the NVIDIA GeForce RTX 3090 Ti for cost-sensitive prototyping at $0.10 per hour start. Its 35.6 TFLOPS FP32 suits graphics, gaming, or FP32-heavy science tasks where 24 GB VRAM suffices.
Solo developers prefer RTX 3090 Ti's 350W TDP and PCIe simplicity for Stable Diffusion or fine-tuning under budget constraints.
Use Cases
A100 PCIe 40GB's 40 GB VRAM and 312 TFLOPS FP16 support large models and batches unavailable on RTX 3090 Ti's 24 GB and 35.6 TFLOPS.
High 2039 GB/s bandwidth on A100 PCIe 40GB enables low-latency serving of big models. RTX 3090 Ti's 936 GB/s bottlenecks high-throughput inference.
RTX 3090 Ti handles small-to-medium models at $0.10 per hour. A100 PCIe 40GB excels for datasets needing 40 GB VRAM.
RTX 3090 Ti's 24 GB GDDR6X and 35.6 TFLOPS FP32 generate images efficiently at low cost. A100 PCIe 40GB overkill for typical diffusion tasks.
RTX 3090 Ti's 35.6 TFLOPS FP32 matches many simulations better than A100 PCIe 40GB's 19.5 TFLOPS, with lower 350W TDP.
Frequently Asked Questions
Which GPU has more VRAM, A100 PCIe 40GB or RTX 3090 Ti?▾
The A100 PCIe 40GB provides 40 GB HBM2e VRAM. RTX 3090 Ti offers 24 GB GDDR6X. This makes A100 superior for memory-intensive AI models.
How do cloud prices compare for A100 PCIe 40GB and RTX 3090 Ti?▾
A100 PCIe 40GB starts at $0.60 per hour, averaging $1.85 across 11 offers. RTX 3090 Ti begins at $0.10 per hour, averaging $0.25 across 5 offers. RTX 3090 Ti saves up to 92 percent on hourly costs.
What is the FP16 performance difference?▾
A100 PCIe 40GB delivers 312 TFLOPS FP16. RTX 3090 Ti reaches 35.6 TFLOPS FP16. A100 provides nearly 9 times the half-precision throughput for ML.
Which has higher memory bandwidth?▾
A100 PCIe 40GB achieves 2039 GB/s bandwidth. RTX 3090 Ti has 936 GB/s. A100's advantage supports 2.2 times faster data movement for large batches.
Is RTX 3090 Ti good for multi-GPU setups?▾
RTX 3090 Ti supports NVLink interconnect like A100 PCIe 40GB. However, A100 adds PCIe 4.0 and InfiniBand for better cluster scaling. Both handle PCIe form factors.
What are the TDP ratings?▾
A100 PCIe 40GB has 400W TDP. RTX 3090 Ti uses 350W TDP. Lower power on RTX 3090 Ti aids consumer or edge deployments.
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.