NVIDIA GeForce RTX 4090 vs NVIDIA GeForce RTX 5090
Spec-driven comparison from our catalog. For curated editorial verdicts on the most-asked pairs, see the head-to-head index.
Editorial verdict available: We have a hand-written buyer guide for this exact pair. Read the editorial verdict →
Pick your two cards
Spec matrix
| Dimension | NVIDIA GeForce RTX 4090 | NVIDIA GeForce RTX 5090 |
|---|---|---|
| VRAM | 24 GB high (70B Q4 comfortable) | 32 GB flagship (FP16 32B / quantized 70B+) |
| Memory bandwidth | 1008 GB/s strong (800 GB/s - 1.5 TB/s) | 1792 GB/s excellent (>1.5 TB/s) |
| FP16 compute | 82.6 TFLOPS | 125 TFLOPS |
| FP8 compute | — | 250 TFLOPS |
| Power draw | 450 W extreme (1000W+ PSU) | 575 W extreme (1000W+ PSU) |
| Price | ~$1,899 (street) | ~$2,499 (street) |
| Release year | 2022 | 2025 |
| Vendor | nvidia | nvidia |
| Runtime support | CUDA, Vulkan | CUDA, Vulkan |
Spec data from our hardware catalog. This is a generated spec compare, not a hand-written editorial verdict. For editorial picks on the most-asked pairs, see our curated head-to-heads.
Most users should buy
NVIDIA GeForce RTX 5090
32 GB usable VRAM unlocks flagship (FP16 32B / quantized 70B+) workloads that the NVIDIA GeForce RTX 4090's 24 GB ceiling can't reach. For most local AI buyers in 2026, VRAM ceiling is the dimension that matters most.
Decision rules
- You're comfortable with used silicon and prioritize $/GB-VRAM.
- You target flagship (FP16 32B / quantized 70B+) workloads — 32 GB is the working ceiling for that.
- You hate used silicon and want a warranty. The NVIDIA GeForce RTX 5090 is the new-with-warranty alternative.
Biggest buyer mistake on this comparison
Buying based on the spec sheet without verifying the actual workload requirement. Run /will-it-run with your specific model + context-length combination before committing — the math is exact and frequently surprising.
Workload fit
How each card handles common local AI workloads. “Tie” means both cards meet the bar; pick on other axes (price, ecosystem, form factor).
| Workload | Winner | Notes |
|---|---|---|
| Coding agents (Aider, Cursor, Continue) | Tie | Code agents work fine on 16 GB for 13-32B models. 24 GB unlocks 70B-class code models (DeepSeek Coder V3, Qwen 2.5 Coder). |
| Ollama / LM Studio chat | Tie | Both run Ollama fine. 16 GB unlocks multi-model serving via OLLAMA_KEEP_ALIVE. |
| Image generation (SDXL, Flux Dev) | NVIDIA GeForce RTX 5090 | Image gen is compute-bound. 24 GB VRAM unlocks Flux Dev FP16 + LoRA training. Below 24 GB, Flux Dev FP8 only with offloading. |
| Local RAG (embedding + LLM) | Tie | RAG with 70B LLM concurrent fits at 24 GB. Embedding model overhead is negligible (<1 GB). |
| Long-context chat (32K+ context) | Tie | 32 GB unlocks 32K+ context on 70B Q4 comfortably. |
| Voice / Whisper transcription | Tie | Whisper Large V3 fits in 4-8 GB. Both cards likely overkill for transcription-only workloads. |
| Video generation (LTX-Video, Mochi) | Tie | Local video gen production-ready at 32 GB. |
| Multi-GPU tensor parallel (vLLM, ExLlamaV2) | NVIDIA GeForce RTX 4090 | Tensor-parallel scaling works on PCIe 4.0 x8/x16. Used cards typically win on $/GB-VRAM at scale (dual 3090 vs single 5090). |
VRAM reality check
- Multi-GPU does NOT pool VRAM by default. Two 24 GB cards = 48 GB combined ONLY when the runtime supports tensor-parallel inference (vLLM, ExLlamaV2, llama.cpp split-mode). For models that don't tensor-parallel cleanly, you're stuck at single-card VRAM.
- At 32 GB+, FP16 32B inference works comfortably. 70B Q4 with 32K+ context fits. Multi-model serving (parallel KV cache headroom) becomes practical.
Power, noise, and thermals
- NVIDIA GeForce RTX 4090 TDP: 450W. NVIDIA GeForce RTX 5090 TDP: 575W. Plan PSU sizing for transient spikes — sustained AI inference draws closer to nameplate TDP than gaming benchmarks suggest. Add 200-250W headroom over GPU TDP for the rest of the system.
- Used cards: replace thermal pads on any used purchase older than 18 months ($30-50 + 1 hour of work). Ex-mining cards specifically — cooler reseat improves thermals 5-10°C, often the difference between throttling and stable load.
Used-market intelligence
- Mining-rig provenance is dominant for used NVIDIA GeForce RTX 4090 listings. Not inherently disqualifying — mining wears fans (replaceable) and thermal pads (replaceable), rarely silicon. Verify ECC error counts with nvidia-smi (or vendor equivalent); any value above ~100 = walk away.
- Demand a 30-minute under-load demonstration before paying — screen-recorded inference at 90%+ utilization. Sellers refusing this are red flags.
- Replace thermal pads on any used GPU older than 18 months. Cheap insurance ($30-50 + 1 hour) that often delivers 5-10°C cooler operation under sustained inference.
- Used cards have no warranty. Budget for a 2-3 year operational horizon and plan to resell if your usage tier changes. Used silicon resale is mature in 2026 — selling later is realistic.
Upgrade-path logic
- NVIDIA GeForce RTX 4090 → NVIDIA GeForce RTX 5090 is a real VRAM-tier upgrade (24 GB → 32 GB). Worth it if you're outgrowing the lower-tier ceiling on 70B-class workloads.
Better alternatives to consider
Quick takes
NVIDIA GeForce RTX 4090
24 GB GDDR6X at about 1 TB/s. Check 32B Q4 models against your context budget; 70B Q4 weights exceed this card’s memory and require offload or multiple GPUs.
Full verdict →NVIDIA GeForce RTX 5090
Blackwell flagship with 32 GB GDDR7 and about 1.79 TB/s memory bandwidth. More context headroom than a 24 GB card for 32B Q4; 70B Q4 still requires offload or more GPU memory.
Full verdict →