Can I Run Cosmos 3 Nano on NVIDIA GeForce RTX 4080 Super?

Name: LLM Configurator — GPU VRAM Checker
Author: LLM Configurator

Written by Jakub Rusinowski · Last updated August 15, 2026

Not at BF16 — that needs 32.0 GB and the NVIDIA GeForce RTX 4080 Super has 16 GB. Drop to Q5_K_M and it fits in 13.6 GB, with up to 16K of context.

The numbers

Model	Cosmos 3 Nano
Parameters	16B
Quantization	BF16
VRAM needed	32.0 GB
NVIDIA GeForce RTX 4080 Super VRAM	16 GB
Verdict	Runs at a lower quant
Fits at	Q5_K_M (13.6 GB)
Max context	16K

What to do next

Quantize to Q5_K_M. That is the cheapest fix — it costs some quality but no money.

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Running Cosmos 3 Nano on this card:

NVIDIA GeForce RTX 4080 Super 16GB

16 GB VRAM · 320 W board power

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Check price on Amazon

Won't fit — rent Cosmos 3 Nano instead

Cosmos 3 Nano needs ~32 GB but this GPU has 16 GB. Rent a A100 (40 GB)-class GPU by the hour instead of buying one:

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Vast.ai $0.55/hr · typical low · varies

Rent on Vast.ai →

Cloud rates verified 2026-07 — estimates, and marketplace prices vary. Buying price is GPU MSRP only, not a full PC.

Other Cosmos 3 sizes on the NVIDIA GeForce RTX 4080 Super

Cosmos 3 Super — does not fit (128.0 GB)
Cosmos 3 Edge — runs (8.0 GB)

Cosmos 3 Nano on nearby hardware

Intel Arc B580 (12 GB) — runs at a lower quant
AMD Radeon RX 7900 XT (20 GB) — runs at a lower quant

All Cosmos 3 sizes on the NVIDIA GeForce RTX 4080 Super | VRAM calculator for Cosmos 3 Nano | NVIDIA GeForce RTX 4080 Super GPU page | Check your hardware