estimate
Can I run Ornith-1.5-122B on a Dual RTX 4090?
Only with CPU offload (slow) (estimate)
speed: not estimated for MoE yet
Can I run Ornith-1.5-122B on a Dual RTX 4090? Only with CPU offload (slow) (estimate). About 76.8 GB at Q4_K_M (estimate).
VRAM per quant for Ornith-1.5-122B
Updated . The later of the hardware price date and the formula date.
| Quant | Context | Weights | KV | Overhead | Total | Usable | Fit |
|---|---|---|---|---|---|---|---|
| Q4 Q4_K_M | 8,192 tokens | 75.8 GB measured GGUF file size | 0.2 GB estimate | 0.8 GB estimate | 76.8 GB estimate | 46.8 GB estimate | offload |
| Q5 Q5 (~0.71 bytes/param) | 8,192 tokens | 88.8 GB estimate | 0.2 GB estimate | 0.8 GB estimate | 89.8 GB estimate | 46.8 GB estimate | offload |
| Q8 Q8 | 8,192 tokens | 133.8 GB estimate | 0.2 GB estimate | 0.8 GB estimate | 134.8 GB estimate | 46.8 GB estimate | offload |
| FP16 FP16 | 8,192 tokens | 250.2 GB estimate | 0.2 GB estimate | 0.8 GB estimate | 251.2 GB estimate | 46.8 GB estimate | no |
| Q4, longer context | 32,768 tokens | 75.8 GB measured GGUF file size | 0.8 GB estimate | 0.8 GB estimate | 77.4 GB estimate | 46.8 GB estimate | offload |
Formula estimate, not a benchmark. Method →
Cheapest catalog option that fits at Q4
Mac Studio M4 Max 128GB, catalog price, €3,290, dated 2026-10-16. No buy link.
This hardware
$8,206€7,330
price as of 16 Oct 2026
128 GB DDR4 (estimate): $2,754€2,460. From the 16 Oct 2026 fact-check.
rest of system (estimate): $560€500. The total is the GPU price plus the RAM line plus this estimate. It is not a checked system price.
price unverifiedGPU line is 2× the used median €2,185 (€4,370), labelled used, from pcprice.watch (https://www.pcprice.watch/gpu-buying-guide/rtx-4090-price-used-and-specs). 128 GB DDR4 (estimate) €2,460, from the 16 Oct 2026 fact-check. Rest of system (estimate) €500. Other parts from €500 in that fact-check. Not a shop listing. DDR5 was not separately priced, so this total uses the sourced 128 GB DDR4 line. The total is the GPU price plus the RAM line plus that rest estimate. It is not a checked system price.
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Ornith-1.5-122B on Dual RTX 4090
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Questions
- Can I run Ornith-1.5-122B on a Dual RTX 4090?
- Only with CPU offload (slow) (estimate).
- How much memory does Ornith-1.5-122B need at Q4?
- About 76.8 GB at 8,192 tokens (estimate): 75.8 GB weights (measured GGUF file size), 0.2 GB KV cache, 0.8 GB overhead.
- How fast is Ornith-1.5-122B on Dual RTX 4090 (estimate)?
- speed: not estimated for MoE yet
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Read next: Building a local LLM rig in the RAMageddon.