Specifications Compared
| Spec | MI300X | RTX-3090 |
|---|---|---|
| TDP | 750W | 350W |
| VRAM | 192 GB | 24 GB |
| Memory Type | HBM3 | GDDR6X |
| Architecture | CDNA 3 | Ampere |
| Form Factors | OAM | PCIe |
| Interconnect | Infinity Fabric, PCIe 5.0 | NVLink |
| FP8 Performance | 2,614 TFLOPS | |
| FP16 Performance | 1,307 TFLOPS | 35.6 TFLOPS |
| FP32 Performance | 163 TFLOPS | 35.6 TFLOPS |
| FP64 Performance | 81.7 TFLOPS | |
| INT8 Performance | 2,614 TOPS | |
| Memory Bandwidth | 5,300 GB/s | 936 GB/s |
Performance Analysis
The MI300X delivers 1307 TFLOPS in FP16 and 2614 TFLOPS in FP8, dwarfing the RTX 3090 Ti's 35.6 TFLOPS in FP16: this enables the MI300X to train large neural networks 36 times faster in half-precision formats prevalent in modern AI. Its FP32 throughput of 163 TFLOPS also outpaces the RTX 3090 Ti's 35.6 TFLOPS, benefiting general-purpose computing tasks. The pronounced FP16/FP32 ratio on MI300X accelerates mixed-precision training and inference pipelines.
Memory bandwidth defines scalability: the MI300X's 5300 GB/s supports batch sizes for models exceeding 100 billion parameters, minimizing data bottlenecks in LLM training. The RTX 3090 Ti's 936 GB/s restricts it to smaller batches, prolonging iteration times on memory-intensive workloads. Power draw further differentiates them, with MI300X at 750W for sustained high throughput versus RTX 3090 Ti's 350W for efficiency in lighter loads.
Live Cloud Pricing
Real-time prices from 25+ providers. Updated every 60 seconds.
MI300X
| Provider | GPU Model | VRAM | Host Specs | Region | Price | Status | Action | |
|---|---|---|---|---|---|---|---|---|
 RunPod | AMD Instinct MI300X 192GB VRAM | 192GB | 24 vCPU 256GB RAM | 🌍global | $1.99/GPU/hr | |||
 Hot Aisle | AMD Instinct MI300X 192GB VRAM | 192GB | 8 vCPU 224GB RAM 12288GB Storage | Michigan | $1.99/GPU/hr | Available | ||
 Cirrascale | 8×AMD Instinct MI300X 192GB VRAM | 192GB | 192 vCPU 2355GB RAM 44538GB Storage | United States | $3.08/GPU/hr $24.64/hr total (8×) | |||
 Crusoe | AMD Instinct MI300X 192GB VRAM | 192GB | 0 vCPU 0GB RAM | United States | $3.45/GPU/hr | |||
Cirrascale | 8×AMD Instinct MI300X 192GB VRAM | 192GB | 192 vCPU 2355GB RAM 44538GB Storage | United States | $3.47/GPU/hr $27.76/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 MI300X
Opt for the MI300X in large-scale AI training or inference where 192 GB HBM3 VRAM handles massive models without multi-GPU sharding. Its 1307 TFLOPS FP16 and 5300 GB/s bandwidth excel in HPC simulations or LLMs over 70B parameters, justifying $2.63 hourly average for rapid ROI.
Datacenter environments with Infinity Fabric interconnects benefit from MI300X's OAM form factor for dense clusters.
When to Choose the RTX 3090 Ti
Select the RTX 3090 Ti for budget-driven tasks like gaming, video rendering, or small-scale inference at $0.25 hourly average. Its 24 GB GDDR6X suffices for Stable Diffusion or fine-tuning models under 13B parameters, with 350W TDP enabling easy integration in consumer clouds.
NVLink support aids dual-GPU setups for cost-effective prototyping without datacenter overhead.
Use Cases
MI300X's 192 GB HBM3 and 1307 TFLOPS FP16 support training models over 100B parameters with large batches. RTX 3090 Ti's 24 GB limits scale.
2614 TFLOPS FP8 on MI300X accelerates high-throughput serving for 70B+ models. RTX 3090 Ti handles only smaller deployments efficiently.
163 TFLOPS FP32 and 5300 GB/s bandwidth on MI300X speed iterations on large datasets. RTX 3090 Ti suffices for models under 7B but bottlenecks sooner.
RTX 3090 Ti's 35.6 TFLOPS FP16 and $0.25 hourly cost optimize image generation pipelines. MI300X overkill for 512x512 resolutions.
MI300X's 750W TDP sustains 163 TFLOPS FP32 for simulations like molecular dynamics. RTX 3090 Ti's lower bandwidth constrains complex meshes.
Frequently Asked Questions
What is the VRAM difference between MI300X and RTX 3090 Ti?▾
MI300X offers 192 GB HBM3, eight times the RTX 3090 Ti's 24 GB GDDR6X. This enables larger models and batches on MI300X. Bandwidth follows suit at 5300 GB/s versus 936 GB/s.
How do cloud prices compare for these GPUs?▾
MI300X rentals start at $0.50 per hour, averaging $2.63 across 9 providers. RTX 3090 Ti begins at $0.10 per hour, averaging $0.25 across 5 offers. Prices reflect datacenter versus consumer positioning.
Which has higher FP16 performance?▾
MI300X achieves 1307 TFLOPS FP16, 36 times the RTX 3090 Ti's 35.6 TFLOPS. This gap accelerates AI training significantly. FP8 on MI300X reaches 2614 TFLOPS for inference.
What are the power requirements?▾
MI300X draws 750W TDP for peak performance. RTX 3090 Ti uses 350W, suiting lower-power setups. Higher TDP on MI300X correlates with 5300 GB/s bandwidth.
Can RTX 3090 Ti handle large LLMs?▾
RTX 3090 Ti's 24 GB VRAM limits it to models under 13B parameters without quantization. MI300X's 192 GB supports 70B+ natively. Use Ti for prototyping only.
What interconnects do they support?▾
MI300X uses Infinity Fabric and PCIe 5.0 for datacenter scaling. RTX 3090 Ti relies on NVLink and PCIe for consumer multi-GPU. MI300X excels in clusters.
Which is cheaper to rent, the MI300X or the RTX 3090?▾
Cloud rental prices for both the MI300X 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 MI300X have compared to the RTX 3090?▾
The MI300X has 192 GB of HBM3 memory. The RTX 3090 has 24 GB of GDDR6X memory.
Can I find MI300X 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 MI300X and the RTX 3090?▾
The MI300X uses the CDNA 3 architecture (2023) while the RTX 3090 uses Ampere (2020). The MI300X delivers 36.7x the FP16 throughput and 5.7x the memory bandwidth of the RTX 3090.