How much VRAM does VoxCPM2 need?

Q4_K is exactly 1,689,498,432 bytes (1.57 GiB) in weights. Add the KV cache, which depends on context length, plus roughly half a gigabyte of runtime overhead.

openbmb · audio tts

VoxCPM2

openbmb/VoxCPM2

VoxCPM2 at Q4_K is exactly 1,689,498,432 bytes (1.57 GiB / 1.69 GB) — an effective 5.902 bits per weight, not the nominal 4.

From the file· summed from 1 file(s)From the file· KV per layer

Parameters

2.3B

Architecture

voxcpm-acoustic

null layers

Context

—

native (config.json)

License

apache-2.0

Shipped quantizations

● exact bytes, summed from published files

Quant	Size●	Exact bytes●	Effective bpw●	Tensors●	Publisher
Q4_K	1.57 GiB	1,689,498,432	5.902	—	cstr
Q8_0	1.61 GiB	1,727,309,920	6.034	—	wt5719001
Q8_0	1.61 GiB	1,727,309,920	6.034	—	DennisHuang648
Q8_0	2.63 GiB	2,827,049,792	9.876	—	cstr
F16	4.63 GiB	4,972,550,208	17.371	—	cstr
F162 shards	4.72 GiB	5,073,076,896	17.723	—	wt5719001
F162 shards	4.72 GiB	5,073,076,896	17.723	—	DennisHuang648

Compare with

same modality, comparable size

vs Ace-Step1.5 vs Qwen3-TTS-12Hz-0.6B-Base vs OmniVoice vs orpheus-3b-0.1-ft vs neutts-air vs s2-pro All alternatives →Will it fit on my card? →

Why other calculators give a different number

A parameters × bits ÷ 8 estimate puts Q4_K at roughly 1.20 GiB. The real file is 1.57 GiB, because a quantization is a mixture and some tensors are always kept at higher precision.

Architecture

from config.json

Layers

—

Attention heads

—

KV heads

—

Head dim

—

Hidden size

—

Vocab

—

Sliding window

none

SWA period

—

MLA

Experts

—

Experts per token

—

use_sliding_window

—

Questions people ask

How much VRAM does VoxCPM2 need?: Q4_K is exactly 1,689,498,432 bytes (1.57 GiB) in weights. Add the KV cache, which depends on your context length, plus roughly half a gigabyte of runtime overhead.
Which quantization of VoxCPM2 should I use?: Q4_K_M is the usual default. Pick the largest quantization that fits your card at the context you actually need — the table above gives exact sizes for every one published.