Can I Run InternLM 3 20B Instruct on NVIDIA GeForce RTX 4090?

Written by Jakub Rusinowski · Last updated August 15, 2026

Yes. InternLM 3 20B Instruct needs 12.1 GB at Q4_K_M and the NVIDIA GeForce RTX 4090 has 24 GB, leaving about 11.9 GB of headroom, at roughly 62 tok/s (estimated) with room for up to 32K of context.

The numbers

ModelInternLM 3 20B Instruct
Parameters20B
QuantizationQ4_K_M
VRAM needed12.1 GB
NVIDIA GeForce RTX 4090 VRAM24 GB
VerdictRuns
Max context32K
Estimated speed~62 tok/s

What to do next

Nothing to change — run it at Q4_K_M. If you want more capability, check whether the next size up also fits.

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Running InternLM 3 20B Instruct on this card:

NVIDIA GeForce RTX 4090 24GB
24 GB VRAM · 450 W board power
2026 prices are volatile — check the current listing.
Check price on Amazon

Buy vs. rent InternLM 3 20B Instruct
Buy the GPU
~$1,599
NVIDIA GeForce RTX 4090 · MSRP
Rent by the hour
from $0.34/hr
RTX 4090 (24 GB) class

At 2 hrs/day, buying (~$1,599) beats renting at $0.34/hr after about 6.5 years.

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RunPod $0.34/hr
Rent on RunPod →
Vast.ai $0.35/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 InternLM 3 sizes on the NVIDIA GeForce RTX 4090

InternLM 3 20B Instruct on nearby hardware

All InternLM 3 sizes on the NVIDIA GeForce RTX 4090 | VRAM calculator for InternLM 3 20B Instruct | NVIDIA GeForce RTX 4090 GPU page | Check your hardware