direct comparison under identical conditions
RTX 4090 vs RTX 5090 local LLM speed/VRAM comparison
If it's a 24GB model, the 4090 or mid-range might be reasonable, and if you need a 32GB loading limit, it's narrowed down to the 5090.
core difference
| Measure | RTX 4090 24GB | RTX 5090 32GB |
|---|---|---|
| Available fast memory | 22.5GB | 30.5GB |
| Memory bandwidth | 1008GB/s | 1792GB/s |
| Sustained LLM power | about 470W | about 620W |
| Korean price range (KRW) | 348–385 × KRW 10,000 | 620–780 × KRW 10,000 |
Which device suits the task?
| purpose | superior equipment | reason |
|---|---|---|
| Chat / coding | RTX 5090 32GB | In token generation with the same model, the side with higher memory bandwidth has an advantage. |
| Documents / RAG | RTX 5090 32GB | The side with larger available memory provides more headroom for longer contexts and KV cache. |
| Image / video | Similar | Let's look at generation tool compatibility and available GPU memory together. |
| Setup | Similar | Compare finished product status and initial driver·system configuration burden. |
| Power / space | RTX 4090 24GB | Prioritize the side with lower sustained power load. |
Local pricing
RTX 4090 24GB is approximately 3,340,000 KRW cheaper than the mid-range price. Check both perceived speed and task-specific performance.