RTX PRO 4000 vs RTX 4000 SFF Ada for local AI
Today the RTX 4000 SFF Ada is cheaper: $1,510.30 against $2,827.16 for the RTX PRO 4000. Per gigabyte of memory the RTX 4000 SFF Ada wins, $75 against $117. For Qwen3.8 27B · Q4_K_M the RTX PRO 4000 is faster, about 27 against 11 tokens per second. The RTX PRO 4000 holds more, 24 GB against 20 GB, and fits 11 of our 28 reference models at Q4_K_M where the RTX 4000 SFF Ada fits 8.
| NVIDIA RTX PRO 4000 Blackwell | NVIDIA RTX 4000 SFF Ada | |
|---|---|---|
| Lowest price today, delivered | $2,827.16 on eBay | $1,510.30 on eBay |
| Price per GB | $117/GB | $75/GB |
| Memory | 24 GB GDDR7 ECC | 20 GB GDDR6 ECC |
| Memory bandwidth | 672 GB/s | 280 GB/s |
| FP16 compute, dense | n/a | 77 TFLOPS |
| Reference models that fit at Q4_K_M | 11 of 28 | 8 of 28 |
| Power | 140 W | 70 W |
| Form factor | Single slot, full height | Dual slot, low profile, no power connector |
| Interface | PCIe 5 | PCIe 4 |
| Software platform | cuda | cuda |
| Launched | 2025 | 2023 |
| Launch price | $1,500 | $1,250 |
Qwen3.8 27B · Q4_K_M by quantization
| Quant | RTX PRO 4000 | RTX 4000 SFF Ada |
|---|---|---|
| FP16 | does not fit | does not fit |
| Q8_0 | does not fit | does not fit |
| Q6_K | ~20 tok/s, 5K ctx | does not fit |
| Q5_K_M | ~23 tok/s | does not fit |
| Q4_K_M | ~27 tok/s | ~11 tok/s |
| Q3_K_M | ~33 tok/s | ~14 tok/s |
| IQ2_M | ~48 tok/s | ~20 tok/s |
Fit means the weights plus an 8K context cache fit in memory; speed is the estimated decode rate. Prices are the cheapest live eBay listing that passed our filters, item plus shipping. How we estimate.