estimate
Can I run Ornith-1.5-122B on an RTX 4090?
No: needs ~76.8 GB, this card has ~23.4 GB usable (estimate)
speed: not estimated for MoE yet
Can I run Ornith-1.5-122B on an RTX 4090? No: needs ~76.8 GB, this card has ~23.4 GB usable (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 | 23.4 GB estimate | no |
| 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 | 23.4 GB estimate | no |
| Q8 Q8 | 8,192 tokens | 133.8 GB estimate | 0.2 GB estimate | 0.8 GB estimate | 134.8 GB estimate | 23.4 GB estimate | no |
| FP16 FP16 | 8,192 tokens | 250.2 GB estimate | 0.2 GB estimate | 0.8 GB estimate | 251.2 GB estimate | 23.4 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 | 23.4 GB estimate | no |
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
$2,446€2,185
used (median of sold listings)
price as of 16 Oct 2026
new (lowest in-stock EU): $4,243€3,790. GPU PRIX. Current low €3,790, MSI Gaming X Slim, Belgium. Page last updated 15 Oct 2026, checked 16 Oct 2026. In-stock boards in that table start at €3,990.
pcprice.watchUsed median €2,185, typical €2,074–€2,290, 111 sales, updated 16 Oct 2026. Not an EU retail listing.
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Ornith-1.5-122B on RTX 4090
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Questions
- Can I run Ornith-1.5-122B on an RTX 4090?
- No: needs ~76.8 GB, this card has ~23.4 GB usable (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 RTX 4090 (estimate)?
- speed: not estimated for MoE yet
Rig Report waitlist
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Read next: Building a local LLM rig in the RAMageddon.