Mixtral 8x22B Instruct on Atlas 300I Duo 96GB (310P) (96GB) — VRAM, KV Cache & Throughput

Q: Does Mixtral 8x22B Instruct fit on Atlas 300I Duo 96GB (310P) (96GB)?

In 4-bit (Q4_K_M) at 8,192 context, Mixtral 8x22B Instruct requires 81.78 GiB total GPU memory (79.46 GiB weights + 1.75 GiB KV cache + 0.57 GiB runtime buffers) against 91.2 GiB usable on Atlas 300I Duo 96GB (310P), delivering ~8.6 tok/s decode.

Q: How much VRAM does Mixtral 8x22B Instruct need at 32K context?

At 32,768 context tokens, Mixtral 8x22B Instruct (Sparse MoE + GQA) allocates 7 GiB for KV cache and state, bringing total 4-bit VRAM to 87.03 GiB (93.45 GB decimal).

Mixtral 8x22B Instruct (140.6B total, 39.1B active, Sparse MoE + GQA) uses 79.46 GiB of 4-bit weights (Q4_K_M), requiring 81.78 GiB total at 8K context and 87.03 GiB at 32K on Atlas 300I Duo 96GB (310P) (~8.6 tok/s decode).

Interactive Sizing Workbench

Full Compatibility Report →

Open-Weight Model140.6B / 39.1B

Weights & QuantizationQ4_K_M · 79.46 GiB

Context Window8,192 (8K)

Target Hardware

96 GB · 408 GB/s

GPU Count (Tensor Parallel)

Concurrent Batch Size

KV Cache Precision

Inference Engine

System RAM Offload (CPU)0%

Fits with Safe Headroom

Config-derived formula HF config.json ↗

Memory Allocation Breakdown (GiB) 81.78 GiB (87.81 GB) / 96 GiB (85%)

Model Weights: 79.46 GiB KV Cache & State: 1.75 GiB Runtime & Activation Buffers: 0.57 GiB System RAM Offload: 0 GiB

Required GPU Memory

81.78 GiB

87.81 GB (decimal)

Usable Hardware Memory

91.2 GiB

96 GB (physical)

Safe Headroom

+9.42 GiB

85% utilization

Est. Decode Throughput

~8.6 tok/s

39.1B active params

Est. Prefill Throughput

~931 tok/s

4K Prompt TTFT: ~4400 ms

Est. Cost / 1M Tokens

$54.04

Sparse MoE + GQA · Apache-2.0

Recommended Hardware for Current Configuration

Best Single GPU

RTX PRO 6000 Blackwell (96GB)

~$8,500

Best Value / Used GPU

2x A100 80GB SXM

160GB · ~$24,000

Apple Unified Memory

Ryzen AI Max+ 395 128GB

~$1,999

Cloud From

Vast.ai · $1.67 / hr

1x RTX PRO 6000 Blackwell

Production Launch Commands

llama.cpp (GGUF)

llama-server -hf mistralai/Mixtral-8x22B-Instruct-v0.1:Q4_K_M \
  --ctx-size 8192 -ngl 999 --flash-attn

vLLM

vllm serve mistralai/Mixtral-8x22B-Instruct-v0.1 \
  --max-model-len 8192 --gpu-memory-utilization 0.92

Live Token Speed Simulator (TTFT ~4400ms · ~8.6 tok/s)

[Mixtral 8x22B Instruct · 81.78 GiB] allocated on target GPU. Prefill completed in TTFT window; streaming autoregressive tokens at memory-bandwidth-bound rate...

Cloud GPU Comparison & Rent-vs-Buy TCO

Verified public rates across RunPod, Vast.ai, Vultr, and DigitalOcean.

Verified: 2026-11-04

Active usage (hours / day)4 h / day

Local hardware budget ($)

Electricity rate ($/kWh)

Purchase break-even

~44.1 months

Est. local power: $12.77 / mo

Provider	Recommended Instance	Total VRAM	Hourly Rate	Monthly at Selected Hours	Billing Mode	Deploy
RunPod	1x RTX PRO 6000 Blackwell (Community Cloud)	96 GB	$1.69 / hr	$205.50 / mo	Per-second	Deploy GPU ↗
Vast.ai	1x RTX PRO 6000 Blackwell (Verified Host)	96 GB	$1.67 / hr	$203.44 / mo	Spot / On-demand	Deploy GPU ↗
*Vultr ($300 Free Credit)**	2x L40S 48GB (Dedicated Instance · $300 Credit*)	96 GB	$3.34 / hr	$406.39 / mo	Hourly	Deploy GPU ↗
Vultr Cloud GPU	2x L40S 48GB (Dedicated Instance)	96 GB	$3.34 / hr	$406.39 / mo	Hourly	Deploy GPU ↗
DigitalOcean	1x Instinct MI300X 192GB (Dedicated Instance)	192 GB	$2.59 / hr	$314.94 / mo	Per-second	Deploy GPU ↗

Rates reflect public listings on the verification date and fluctuate with regional inventory.

Fine-Tuning VRAM Requirements (QLoRA / LoRA / Full) — Mixtral 8x22B Instruct

QLoRA (4b) Fits with Safe Headroom

86.07 GiB

Model Weights: 79.46 GiB · Gradients + Optimizer: 5.47 GiB · Act: 1.14 GiB

Recommended GPU: RTX PRO 6000 Blackwell (96GB)

LoRA (16b) Exceeds Available GPU Memory

272.01 GiB

Model Weights: 261.89 GiB · Gradients + Optimizer: 8.6 GiB · Act: 1.52 GiB

Recommended GPU: 2x B200 180GB (360GB)

Full BF16 Exceeds Available GPU Memory

1076.44 GiB

Model Weights: 261.89 GiB · Gradients + Optimizer: 811.86 GiB · Act: 2.69 GiB

Recommended GPU: 8x B200 180GB (1440GB)

Engineering Sizing Notes & Optimization Playbook

Quick Hardware Verdict

Atlas 300I Duo 96GB (310P) (96GB physical, 91.2 GiB usable) runs 4-bit (Q4_K_M) Mixtral 8x22B Instruct at 8K context using 81.78 GiB with 9.42 GiB of safe headroom (~8.6 tok/s single-stream decode).

KV Cache & Runtime Tuning

Mixtral 8x22B Instruct uses Sparse MoE + GQA (140.6B total, 39.1B active per token). Moving from 8K to 32K context expands FP16 KV cache from 1.75 GiB to 7 GiB; enabling 8-bit KV cache (llama.cpp -ctk q8_0 -ctv q8_0 or vLLM --kv-cache-dtype fp8) saves 3.5 GiB at 32K (reducing total VRAM to 83.53 GiB).

VRAM Scaling Across Context Windows (4K to 128K, 4-bit Weights)

Model weights remain constant while attention KV cache grows with context length and batch size.

Quantization Precision & Memory Matrix — Mixtral 8x22B Instruct @ 8K

Quantization Format	Weights (GiB)	KV Cache	Total VRAM (GiB)	Decode Speed	Compatibility (Atlas 300I Duo 96GB (310P))	Recommended GPU	Data Source
Native Weights (BF16 / FP8 / MXFP4 — Lossless) (BF16)	261.89 GiB	1.75 GiB	264.21 GiB (283.69 GB)	~1 tok/s	Exceeds Available GPU Memory	Instinct MI355X 288GB (288GB)	Official checkpoint size
FP8 / GGUF Q8_0 (8-bit — Near-Lossless) (Q8_0)	139.13 GiB	1.75 GiB	141.45 GiB (151.88 GB)	~2.6 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Config-derived formula
GGUF Q6_K (6-bit — High Precision) (Q6_K)	107.37 GiB	1.75 GiB	109.69 GiB (117.78 GB)	~4.7 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Config-derived formula
GGUF Q5_K_M (5-bit — Balanced) (Q5_K_M)	93.17 GiB	1.75 GiB	95.49 GiB (102.53 GB)	~7.4 tok/s	Tight Fit (<8% Headroom)	Instinct MI300X 192GB (192GB)	Config-derived formula
Q4_K_M / UD-Q4_K_XL / AWQ (4-bit — Recommended) (Q4_K_M)	79.46 GiB	1.75 GiB	81.78 GiB (87.81 GB)	~8.6 tok/s	Fits with Safe Headroom	RTX PRO 6000 Blackwell (96GB)	Config-derived formula
GGUF IQ4_XS (4.25-bit — Compact) (IQ4_XS)	69.62 GiB	1.75 GiB	71.94 GiB (77.24 GB)	~9.8 tok/s	Fits with Safe Headroom	RTX PRO 6000 Blackwell (96GB)	Config-derived formula
GGUF Q3_K_M (3-bit — Low VRAM) (Q3_K_M)	64.05 GiB	1.75 GiB	66.37 GiB (71.26 GB)	~10.6 tok/s	Fits with Safe Headroom	RTX PRO 6000 Blackwell (96GB)	Config-derived formula
GGUF UD-Q2_K_XL (2-bit — Extreme MoE) (UD-Q2_K_XL)	45.09 GiB	1.75 GiB	47.41 GiB (50.91 GB)	~14.7 tok/s	Fits with Safe Headroom	RTX PRO 6000 Blackwell (96GB)	Config-derived formula

Technical Specifications & FAQ

Does Mixtral 8x22B Instruct fit on Atlas 300I Duo 96GB (310P) (96GB)?

In 4-bit (Q4_K_M) at 8,192 context, Mixtral 8x22B Instruct requires 81.78 GiB total GPU memory (79.46 GiB weights + 1.75 GiB KV cache + 0.57 GiB runtime buffers) against 91.2 GiB usable on Atlas 300I Duo 96GB (310P), delivering ~8.6 tok/s decode.

How much VRAM does Mixtral 8x22B Instruct need at 32K context?

At 32,768 context tokens, Mixtral 8x22B Instruct (Sparse MoE + GQA) allocates 7 GiB for KV cache and state, bringing total 4-bit VRAM to 87.03 GiB (93.45 GB decimal).

Evaluate This Model on Other GPUs

RTX 3060 12GB (12GB)RTX 4060 Ti 16GB (16GB)RTX 4070 Ti Super (16GB)RTX 4080 Super (16GB)RTX 5070 12GB (12GB)RTX 5070 Ti (16GB)RTX 5080 (16GB)RTX 3090 (24GB)RTX 4090 (24GB)RTX 4090 D (24GB)RTX 5090 (32GB)RTX 5090 D (32GB)RTX A6000 (48GB)RTX 6000 Ada (48GB)RTX PRO 6000 Blackwell (96GB)DGX Spark (GB10 128GB) (128GB)L4 24GB (24GB)A40 48GB (48GB)L20 48GB (48GB)L40S 48GB (48GB)A800 80GB SXM (80GB)A100 80GB SXM (80GB)H800 80GB SXM (80GB)H100 80GB SXM (80GB)H20 96GB HBM3 (96GB)H20 141GB HBM3e (141GB)H200 141GB SXM (141GB)B200 180GB (180GB)B300 288GB Blackwell Ultra (288GB)Ascend 910B 64GB (昇腾) (64GB)Ascend 910C 128GB (昇腾) (128GB)MLU590 80GB (寒武纪思元) (80GB)DCU K100-AI 64GB (海光深算) (64GB)MetaX C500 64GB (沐曦曦云) (64GB)Kunlunxin P800 64GB (昆仑芯) (64GB)MTT S4000 48GB (摩尔线程) (48GB)Radeon RX 7900 XTX 24GB (24GB)Radeon AI PRO R9700 32GB (32GB)Ryzen AI Max+ 395 128GB (128GB)Instinct MI300X 192GB (192GB)Instinct MI325X 256GB (256GB)Instinct MI355X 288GB (288GB)Arc Pro B60 24GB (24GB)Gaudi 3 128GB HBM2e (128GB)Mac mini M4 Pro 64GB (64GB)MacBook Pro M4 Max 128GB (128GB)Mac Studio M4 Ultra 256GB (256GB)Mac Studio M3 Ultra 512GB (512GB)

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