RTX 3090 vs RTX 4090 — VRAM & LLM Inference
24GB vs 24GB but Ada Lovelace vs Ampere. Which GPU runs more LLM models? Full breakdown.
RTX 3090 (24GB)RTX 4090 (24GB)
Feature Comparison
| Feature | RTX 3090 (24GB) | RTX 4090 (24GB) |
|---|---|---|
| VRAM | 24 GB | 24 GB |
| Memory Bandwidth | 936 GB/s | 1008 GB/s |
| Architecture | Ampere | Ada Lovelace |
| Llama 3.3 70B Q4 | ❌ Not a fit (VRAM estimate) | ❌ Not a fit (VRAM estimate) |
| Mistral 8x22B Q4 | ❌ Not a fit (VRAM estimate) | ❌ Not a fit (VRAM estimate) |
| Llama 3.1 8B Q4 | ✅ Fits (VRAM estimate) | ✅ Fits (VRAM estimate) |
| Qwen 2.5 7B Q4 | ✅ Fits (VRAM estimate) | ✅ Fits (VRAM estimate) |
| Typical usage | Commonly seen in dual-GPU setups (24 GB) | Commonly used as a single-GPU inference card |
| Price (used) | Used prices vary — check current listings | Used prices vary — check current listings |
Looking for the right GPU?
RTX 3090 (24GB)
Calculate →Consumer or data-center GPU for local LLM inference. Use our VRAM calculator to check model fit.
RTX 4090 (24GB)
Calculate →Consumer or data-center GPU for local LLM inference. Use our VRAM calculator to check model fit.
Ready to choose?
Check out our other comparisons or browse tools by category.
Affiliate Disclosure
Some links on this page are affiliate links. If you purchase through them, we may earn a small commission at no additional cost to you. We only recommend tools we've thoroughly researched and believe add real value.
Our reviews and comparisons are based on objective analysis and are not influenced by affiliate partnerships.