NVIDIA RTX 3090 vs NVIDIA RTX Pro 4500 Blackwell 32GB for local LLMs
219 reports on the NVIDIA RTX 3090 and 5 on the NVIDIA RTX Pro 4500 Blackwell 32GB
Which is faster for local LLMs?
On Qwen3.6 27B at 4-bit, the NVIDIA RTX 3090 has 42.0 generation tokens/s (one run); prompt processing 1020.0 tokens/s (one run); the NVIDIA RTX Pro 4500 Blackwell 32GB has 45.2 generation tokens/s (one run); prompt processing 2022.5 tokens/s (one run). Those are community reports whose engines and settings differ, so the gap is a rough sign, not a controlled measure of the two cards. Memory bandwidth, which caps how fast a card can write, is about the same on both (936 GB/s on the NVIDIA RTX 3090, 896 on the NVIDIA RTX Pro 4500 Blackwell 32GB).
- Memory
- 24GB
- Memory bandwidth
- 936 GB/s
- FP16 compute
- 142 TFLOPS
- Reports
- 219
- Memory
- 32GB
- Memory bandwidth
- 896 GB/s
- FP16 compute
- 190 TFLOPS
- Reports
- 5
Measured on both
Generation and prompt processing speeds from plain runs (one device, one request, no speculative decoding, the whole model in the device's memory) of the same model size at the same bit class. Each side shows the engines and reported context behind its median. Context can mean a configured window or prompt depth, so these are community comparisons with differing settings. How to read these
| Model | NVIDIA RTX 3090 | NVIDIA RTX Pro 4500 Blackwell 32GB |
|---|---|---|
| Qwen3.6 27B4-bit | 42.0one runPP 1020.0 (one run)llama.cpp100K context | 45.2one runPP 2022.5 (one run)llama.cppcontext not stated |
Estimated by the calculator
The quant the calculator recommends for each card and its estimated speed at a 32,768-token context with 32 GB of system RAM, from memory bandwidth and the model's shape. Where a model was also measured above, the measurement wins.
| Model | NVIDIA RTX 3090 | NVIDIA RTX Pro 4500 Blackwell 32GB |
|---|---|---|
| Qwen3.6 27B | 33.9 t/sQ4_K_M | 22.5 t/sQ6_K |
| Qwen3.8 27B | 33.9 t/sQ4_K_M | 22.5 t/sQ6_K |
| Qwen3.8 125B · 6B active | 19.4 t/sQ2_K, experts in RAM | 19.4 t/sQ2_K, experts in RAM |
| Qwen3.6 35B · 3B active | 120.1 t/sQ4_K_S | 81.5 t/sQ5_K_M |
| DeepSeek V4 Flash 284B · 13B active | doesn't fit at these settings | doesn't fit at these settings |
| Gemma 4 26B · 4B active | 76.4 t/sQ5_K_S | 57.2 t/sQ6_K |
| DeepSeek V4.1 Flash 552B · 16B active | doesn't fit at these settings | doesn't fit at these settings |
Change the context, RAM or model in the calculator: NVIDIA RTX 3090 · NVIDIA RTX Pro 4500 Blackwell 32GB
Every report on each card, with its source: NVIDIA RTX 3090 · NVIDIA RTX Pro 4500 Blackwell 32GB