DeepSeek V4 Flash on A40 48GB (48GB) — VRAM, KV Cache & Throughput

DeepSeek V4 Flash (284B total, 11B active, Sparse MoE + GQA) uses 144.44 GiB of 4-bit weights (UD-Q4_K_XL), requiring 145.06 GiB total at 8K context and 145.22 GiB at 32K on A40 48GB (~11.4 tok/s decode).

Interactive Sizing Workbench

Full Compatibility Report →

Open-Weight Model284B / 11B

Weights & QuantizationUD-Q4_K_XL · 144.44 GiB

Context Window8,192 (8K)

Target Hardware

48 GB · 696 GB/s

GPU Count (Tensor Parallel)

Concurrent Batch Size

KV Cache Precision

Inference Engine

System RAM Offload (CPU)0%

Exceeds Available GPU Memory

Measured GGUF shard size HF config.json ↗

Memory Allocation Breakdown (GiB) 145.06 GiB (155.76 GB) / 48 GiB (302%)

Model Weights: 144.44 GiB KV Cache & State: 0.06 GiB Runtime & Activation Buffers: 0.56 GiB System RAM Offload: 0 GiB

Required GPU Memory

145.06 GiB

155.76 GB (decimal)

Usable Hardware Memory

45.6 GiB

48 GB (physical)

Safe Headroom

-99.46 GiB

302% utilization

Est. Decode Throughput

~11.4 tok/s

11B active params

Est. Prefill Throughput

~3545 tok/s

4K Prompt TTFT: ~1155 ms

Est. Cost / 1M Tokens

$63.11

Sparse MoE + GQA · MIT

Recommended Hardware for Current Configuration

Best Single GPU

Instinct MI300X 192GB (192GB)

~$15,000

Best Value / Used GPU

2x A100 80GB SXM

160GB · ~$24,000

Apple Unified Memory

Mac Studio M4 Ultra 256GB

~$5,999

Cloud From

DigitalOcean · $2.59 / hr

1x Instinct MI300X 192GB

Production Launch Commands

llama.cpp (GGUF)

llama-server -hf unsloth/DeepSeek-V4-Flash-GGUF:UD-Q4_K_XL \
  --ctx-size 8192 -ngl 999 --flash-attn

vLLM

vllm serve deepseek-ai/DeepSeek-V4-Flash-0731 \
  --max-model-len 8192 --gpu-memory-utilization 0.92

Live Token Speed Simulator (TTFT ~1155ms · ~11.4 tok/s)

[DeepSeek V4 Flash · 145.06 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

~21.1 months

Est. local power: $15.96 / mo

Provider	Recommended Instance	Total VRAM	Hourly Rate	Monthly at Selected Hours	Billing Mode	Deploy
RunPod	1x B200 180GB (Community Cloud)	180 GB	$5.98 / hr	$727.17 / mo	Per-second	Deploy GPU ↗
Vast.ai	1x B200 180GB (Verified Host)	180 GB	$7.50 / hr	$912.24 / mo	Spot / On-demand	Deploy GPU ↗
*Vultr ($300 Free Credit)**	4x L40S 48GB (Dedicated Instance · $300 Credit*)	192 GB	$6.68 / hr	$812.77 / mo	Hourly	Deploy GPU ↗
Vultr Cloud GPU	4x L40S 48GB (Dedicated Instance)	192 GB	$6.68 / hr	$812.77 / 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) — DeepSeek V4 Flash

QLoRA (4b) Exceeds Available GPU Memory

147.06 GiB

Model Weights: 144.44 GiB · Gradients + Optimizer: 1.54 GiB · Act: 1.08 GiB

Recommended GPU: Instinct MI300X 192GB (192GB)

LoRA (16b) Exceeds Available GPU Memory

150.65 GiB

Model Weights: 146.8 GiB · Gradients + Optimizer: 2.42 GiB · Act: 1.43 GiB

Recommended GPU: Instinct MI300X 192GB (192GB)

Full BF16 Exceeds Available GPU Memory

604.4 GiB

Model Weights: 146.8 GiB · Gradients + Optimizer: 455.08 GiB · Act: 2.52 GiB

Recommended GPU: 4x B200 180GB (720GB)

Engineering Sizing Notes & Optimization Playbook

Quick Hardware Verdict

A single A40 48GB (48GB) cannot hold 4-bit DeepSeek V4 Flash (145.06 GiB at 8K) entirely in VRAM. Use multi-GPU tensor parallelism, offload layers to system RAM, or deploy on a larger cloud GPU.

KV Cache & Runtime Tuning

DeepSeek V4 Flash uses Sparse MoE + GQA (284B total, 11B active per token). Moving from 8K to 32K context expands FP16 KV cache from 0.06 GiB to 0.22 GiB; enabling 8-bit KV cache (llama.cpp -ctk q8_0 -ctv q8_0 or vLLM --kv-cache-dtype fp8) saves 0.11 GiB at 32K (reducing total VRAM to 145.11 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 — DeepSeek V4 Flash @ 8K

Quantization Format	Weights (GiB)	KV Cache	Total VRAM (GiB)	Decode Speed	Compatibility (A40 48GB)	Recommended GPU	Data Source
Native Weights (BF16 / FP8 / MXFP4 — Lossless) (FP4FP8)	146.8 GiB	0.06 GiB	147.42 GiB (158.29 GB)	~11.1 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Official checkpoint size
FP8 / GGUF Q8_0 (8-bit — Near-Lossless) (Q8_0)	146.5 GiB	0.06 GiB	147.12 GiB (157.97 GB)	~11.2 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
GGUF Q6_K (6-bit — High Precision) (Q6_K)	145.8 GiB	0.06 GiB	146.42 GiB (157.22 GB)	~11.2 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
GGUF Q5_K_M (5-bit — Balanced) (Q5_K_M)	145.1 GiB	0.06 GiB	145.72 GiB (156.47 GB)	~11.3 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
Q4_K_M / UD-Q4_K_XL / AWQ (4-bit — Recommended) (UD-Q4_K_XL)	144.44 GiB	0.06 GiB	145.06 GiB (155.76 GB)	~11.4 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
GGUF IQ4_XS (4.25-bit — Compact) (IQ4_XS)	128.43 GiB	0.06 GiB	129.05 GiB (138.57 GB)	~13.2 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
GGUF Q3_K_M (3-bit — Low VRAM) (Q3_K_M)	120.44 GiB	0.06 GiB	121.06 GiB (129.99 GB)	~14.4 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size
GGUF UD-Q2_K_XL (2-bit — Extreme MoE) (UD-Q2_K_XL)	90.18 GiB	0.06 GiB	90.8 GiB (97.5 GB)	~22.1 tok/s	Exceeds Available GPU Memory	Instinct MI300X 192GB (192GB)	Measured GGUF shard size

Technical Specifications & FAQ

Does DeepSeek V4 Flash fit on A40 48GB (48GB)?

In 4-bit (UD-Q4_K_XL) at 8,192 context, DeepSeek V4 Flash requires 145.06 GiB total GPU memory (144.44 GiB weights + 0.06 GiB KV cache + 0.56 GiB runtime buffers) against 45.6 GiB usable on A40 48GB, delivering ~11.4 tok/s decode.

How much VRAM does DeepSeek V4 Flash need at 32K context?

At 32,768 context tokens, DeepSeek V4 Flash (Sparse MoE + GQA) allocates 0.22 GiB for KV cache and state, bringing total 4-bit VRAM to 145.22 GiB (155.93 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)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)Atlas 300I Duo 96GB (310P) (96GB)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)

Evaluate Other Models on This Hardware

Qwen3.8 Flash Next (125B-A6B)Qwen3.8 27B Qwen3.8 2.4T-A95B Qwen3.6 35B-A3B Qwen3.5 397B-A17B Qwen3.5 122B-A10B Qwen3.5 35B-A3B Qwen3.5 27B Qwen3.5 9B Qwen3.5 4B Qwen3 Coder 480B-A35B Qwen3 Coder Next 80B-A3B Qwen3 Coder 30B-A3B Qwen3 30B-A3B Instruct 2507 Qwen3 235B-A22B Instruct 2507 Qwen3 32B Qwen3 14B Qwen3 8B Qwen3 4B Instruct 2507 Qwen3 1.7B Qwen3 0.6B Qwen2.5 72B Instruct Qwen2.5 Coder 32B Instruct QwQ 32B Reasoning DeepSeek V4.1 Flash (552B-A16B)DeepSeek V3.2 (685B)DeepSeek R1-0528 671B DeepSeek V3-0324 671B DeepSeek R1 Distill Llama 70B DeepSeek R1 Distill Qwen 32B DeepSeek R1 Distill Qwen 14B DeepSeek R1 Distill Llama 8B gpt-oss-20b gpt-oss-120b Gemma 4 31B IT Gemma 4 26B-A4B IT Gemma 4 12B IT Gemma 3 27B IT Gemma 3 12B IT Gemma 3 4B IT GLM-5.3 Flash (320B-A18B)GLM-5.3 (753B)GLM-5 (744B)GLM-4.5 (355B-A32B)GLM-4.5 Air (110B-A12B)GLM-4 32B-0414 Kimi K3 (2.8T-A104B)Kimi K2 Instruct (1T-A32B)Kimi-Dev 72B MiniMax M3.1 Flash (428B-A23B)MiniMax M2.5 (229B-A10B)Step-3.7 Flash (198B-A11B)Step-3.5 Flash (197B-A11B)ERNIE 4.5 300B-A47B (文心)ERNIE 4.5 21B-A3B (文心)Hunyuan A13B Instruct (混元 80B)MiniCPM5 2B (面壁)Llama 4 Maverick 17B-128E (400B)Llama 4 Scout 17B-16E (109B)Llama 3.1 405B Instruct Llama 3.3 70B Instruct Llama 3.1 8B Instruct Llama 3.2 3B Instruct Mistral Large 4 (1T-A52B)Mistral Large 2 123B Mixtral 8x22B Instruct Mixtral 8x7B Instruct Mistral Small 3.2 24B Devstral Small 24B Nemotron 3 Ultra 550B-A55B Nemotron 3 Super 120B-A12B Nemotron 3 Nano 30B-A3B Cohere Command A 111B Phi-4 14B Liquid LFM3 1.7B