MI325X vs RTX 3080 Ti

CDNA 3vsAmpereUpdated 33 days ago

The MI325X emerges as the clear winner for AI and compute-intensive tasks: 1307 TFLOPS FP16/FP32 and 256 GB VRAM deliver over 40x the performance of the RTX 3080 Ti's 29.8 TFLOPS and 10-12 GB. Datacenter users demand this scale, despite higher power and absent pricing.

Specifications Compared

SpecMI325XRTX-3080
TDP750W320W
VRAM256 GB10-12 GB
Memory TypeHBM3eGDDR6X
ArchitectureCDNA 3Ampere
Form FactorsOAMPCIe
InterconnectInfinity Fabric
FP8 Performance2,614 TFLOPS
FP16 Performance1,307 TFLOPS29.8 TFLOPS
FP32 Performance1307 TFLOPS29.8 TFLOPS
FP64 Performance40.9 TFLOPS
INT8 Performance2,614 TOPS
Memory Bandwidth6,000 GB/s760 GB/s

Performance Analysis

Raw compute power sets the MI325X far ahead: its 1307 TFLOPS FP16 and FP32 ratings enable rapid training of large models, while the RTX 3080 Ti manages only 29.8 TFLOPS, limiting it to smaller batches. Equal FP16/FP32 performance on both suggests balanced tensor core utilization, but the MI325X's FP8 at 2614 TFLOPS accelerates inference for quantized models. Memory differences prove critical: 256 GB HBM3e on the MI325X supports enormous batch sizes in LLM training, avoiding out-of-memory errors common with the RTX 3080 Ti's 10-12 GB GDDR6X. The MI325X's 6000 GB/s bandwidth sustains data flow for multi-GPU setups via Infinity Fabric, compared to the RTX 3080 Ti's 760 GB/s which bottlenecks large datasets. Power draw reflects this: 750W TDP for MI325X demands robust cooling, versus 320W for RTX 3080 Ti suiting edge deployments.

Live Cloud Pricing

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When to Choose the MI325X

Opt for the MI325X in datacenter-scale AI training or inference: its 256 GB HBM3e VRAM handles models exceeding 100B parameters without splitting. The 6000 GB/s bandwidth and 1307 TFLOPS FP16 excel in distributed workloads over Infinity Fabric. Enterprise users prioritize this for production HPC where OAM form factor integrates seamlessly.

When to Choose the RTX 3080 Ti

Select the RTX 3080 Ti for budget-conscious prototyping or gaming: cloud pricing from $0.08/hr makes it accessible for small-scale inference. Its PCIe form factor and 320W TDP fit consumer rigs or light cloud instances. Developers testing Stable Diffusion or fine-tuning under 10 GB models benefit from 29.8 TFLOPS FP32 at low cost.

Use Cases

LLM Training
MI325X

MI325X's 256 GB HBM3e VRAM accommodates massive datasets for billion-parameter models. 1307 TFLOPS FP16 speeds convergence far beyond RTX 3080 Ti's limits.

LLM Inference
MI325X

2614 TFLOPS FP8 on MI325X optimizes quantized serving at scale. 6000 GB/s bandwidth handles high-throughput queries unlike RTX 3080 Ti's 760 GB/s.

Fine-tuning
Either

RTX 3080 Ti suffices for datasets under 10 GB at $0.08/hr. MI325X accelerates larger adaptations with 1307 TFLOPS FP32.

Stable Diffusion
RTX 3080 Ti

RTX 3080 Ti's 29.8 TFLOPS FP16 generates images efficiently on 10-12 GB VRAM. Low $0.14/hr average suits creative workflows.

Scientific Computing
MI325X

MI325X's 6000 GB/s bandwidth processes simulations with huge arrays. 1307 TFLOPS FP32 outperforms RTX 3080 Ti in HPC clusters.

Frequently Asked Questions

What is the VRAM capacity of MI325X versus RTX 3080 Ti?

MI325X offers 256 GB HBM3e VRAM for large models. RTX 3080 Ti provides 10-12 GB GDDR6X, suitable for smaller workloads.

How do FP16 performance figures compare?

MI325X achieves 1307 TFLOPS FP16 for AI acceleration. RTX 3080 Ti delivers 29.8 TFLOPS, about 44 times less.

What are the memory bandwidth differences?

MI325X bandwidth reaches 6000 GB/s with HBM3e. RTX 3080 Ti offers 760 GB/s GDDR6X, impacting large batch processing.

What is the TDP for each GPU?

MI325X requires 750W for datacenter use. RTX 3080 Ti uses 320W, ideal for consumer systems.

Is there cloud pricing for these GPUs?

RTX 3080 Ti starts at $0.08/hr, averaging $0.14/hr over four offers. MI325X has no live offers currently.

Which architecture do they use?

MI325X employs CDNA 3 from 2024 for AI. RTX 3080 Ti uses Ampere from 2020 for gaming and compute.

Which is cheaper to rent, the MI325X or the RTX 3080?

Cloud rental prices for both the MI325X and RTX 3080 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 MI325X have compared to the RTX 3080?

The MI325X has 256 GB of HBM3e memory. The RTX 3080 has 10 to 12 GB of GDDR6X memory.

Can I find MI325X and RTX 3080 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 MI325X and the RTX 3080?

The MI325X uses the CDNA 3 architecture (2024) while the RTX 3080 uses Ampere (2020). The MI325X delivers 43.9x the FP16 throughput and 7.9x the memory bandwidth of the RTX 3080.