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Qwen / qwen2

Qwen2.5-0.5B

494.0 million parameters.

Open in the calculator →

Architecturepublished data
Quick answer
Qwen2.5-0.5B needs about 1.31 GB at Q4_K_M — the format most people download — with 8,192 tokens of context. It fits entirely on 18 of 18 common devices, starting with the NVIDIA GeForce RTX 5070 (12 GB). What else fits in 12 GB. No hardware for it? Rent a GPU that runs it, priced live.

Sized at 8,192 tokens of context with the whole model in device memory, across 18 common devices. Speeds are estimates, not benchmarks.

Find the NVIDIA GeForce RTX 5070, the smallest card listed here that holds it: Amazon ↗ · eBay (new and used) ↗Store links may pay us a commission. They never decide which card is suggested — the memory arithmetic does.

The base (pre-instruct) checkpoint, catalogued alongside Qwen2.5-0.5B-Instruct because it is downloaded in its own right. Licence declared on the repository: apache-2.0.

Weight-file size by format

FormatSizeRangeBasis
FP161.27 GB0.99 GB – 1.27 GBreconstructed size
Q8_00.68 GB0.53 GB – 0.93 GBreconstructed size
Q6_K0.52 GB0.41 GB – 0.84 GBreconstructed size
Q5_K_M0.46 GB0.35 GB – 0.80 GBreconstructed size
Q5_00.46 GB0.34 GB – 0.80 GBreconstructed size
Q4_K_M0.41 GB0.29 GB – 0.77 GBreconstructed size
Q4_00.40 GB0.28 GB – 0.75 GBreconstructed size
Q3_K_M0.35 GB0.23 GB – 0.73 GBreconstructed size
Q2_K0.29 GB0.17 GB – 0.68 GBreconstructed size

A file size is not the memory a run needs: the KV cache and the runtime reserve come on top, and the calculator adds both.

What the labels mean
published data
Read from a published source — a file's byte count, a model's configuration or a manufacturer's specification — or exact arithmetic on such values. Not a measurement on a machine.
reconstructed size
Weight size reconstructed from the pinned architecture, because no published file exists.
size range
Only a lower and an upper bound are claimed for this weight size.

Hardware ladder

Q4_K_M at 8,192 tokens · 18 of 18 devices hold it entirely
DeviceMemoryVerdictDecodeCalculator
NVIDIA GeForce RTX 50701.31 GB of 12 GBfits~1067 tok/sOpen →
AMD Radeon™ RX 9070 XT1.31 GB of 16 GBfits~1165 tok/sOpen →
NVIDIA GeForce RTX 40801.31 GB of 16 GBfits~1139 tok/sOpen →
NVIDIA GeForce RTX 50801.31 GB of 16 GBfits~1525 tok/sOpen →
NVIDIA GeForce RTX 5070 Ti1.31 GB of 16 GBfits~1423 tok/sOpen →
NVIDIA GeForce RTX 5060 Ti 16GB1.31 GB of 16 GBfits~712 tok/sOpen →
NVIDIA GeForce RTX 40901.31 GB of 24 GBfits~1601 tok/sOpen →
AMD Radeon™ RX 7900 XTX1.31 GB of 24 GBfits~1747 tok/sOpen →
NVIDIA GeForce RTX 30901.31 GB of 24 GBfits~1487 tok/sOpen →
NVIDIA GeForce RTX 50901.31 GB of 32 GBfits~2846 tok/sOpen →
NVIDIA RTX 6000 Ada Generation1.31 GB of 48 GBfits~1525 tok/sOpen →
Apple M4 Pro1.31 GB of 64 GBfits~136 tok/sOpen →
Apple M5 Pro1.31 GB of 64 GBfits~139 tok/sOpen →
AMD Ryzen AI Max+ 395 with Radeon 8060S1.31 GB of 128 GBfits~466 tok/sOpen →
Apple M3 Max1.31 GB of 128 GBfits~146 tok/sOpen →
Apple M4 Max1.31 GB of 128 GBfits~153 tok/sOpen →
NVIDIA DGX Spark1.31 GB of 128 GBfits~434 tok/sOpen →
Apple M2 Ultra1.31 GB of 192 GBfits~160 tok/sOpen →

Decode is a calibrated estimate from the published calibration; capacity is the manufacturer's published ceiling, not guaranteed free memory. Fitting in memory is not the same as loading: whether the runtime and version you have supports this architecture and format on that machine has not been tested here. Offloaded rows assume there is enough system RAM for the overflow — the calculator checks that against the RAM you declare. Each “Open” link keeps this model, format and context.

Run it in the cloud

Rent a GPU that runs Qwen2.5-0.5B

Every rentable machine that holds the whole model, from Vast.ai and RunPod, with this site's speed estimate for each and the provider's own price, read live. Cheapest first; sort by cost per token or speed instead, or switch the format.

Prices · 18:30 UTC, 22 Sept
28 configurations in stock · 5 out of stock
MachineSpeedPer hourPer M tokensWhereRent
1× RTX 306012 GBrecommendedcheapestbest value~571 tok/sFaster than you read$0.036$0.017Vast.aiMarketplace · 99.8% reliableRent on Vast.ai
1× RTX 308010 GB~1207 tok/sFaster than you read$0.082$0.019Vast.aiMarketplace · 98.3% reliableRent on Vast.ai
1× RTX 30708 GB~711 tok/sFaster than you read$0.082$0.032Vast.aiMarketplace · 99.1% reliableRunPod $0.13/h Rent on Vast.ai
1× RTX 4060 Ti 16GB16 GB~457 tok/sFaster than you read$0.090$0.054Vast.aiMarketplace · 99.4% reliableRent on Vast.ai
1× RTX 407012 GB~800 tok/sFaster than you read$0.096$0.033Vast.aiMarketplace · 99.8% reliableRent on Vast.ai
1× RTX 309024 GB~1486 tok/sFaster than you read$0.12$0.023Vast.aiMarketplace · 99.5% reliableRunPod $0.50/h Rent on Vast.ai
1× RTX 5060 Ti 16GB16 GB~711 tok/sFaster than you read$0.12$0.048Vast.aiMarketplace · 99.1% reliableRent on Vast.ai
1× RTX 3080 Ti12 GB~1448 tok/sFaster than you read$0.14$0.026Vast.aiMarketplace · 99.9% reliableRent on Vast.ai

First time renting a GPU? How it works, in four steps
  1. Create an account and add credit. Both providers are prepaid: $10 is enough to try any card on this page for hours. A new RunPod account that arrives through a referral link gets a one-time $5 credit when it first adds $10.
  2. Pick the card and the count shown here, and a template: llama.cpp or vLLM for an OpenAI-compatible API, or one with a web chat if you only want to talk to the model. “How to launch it” below gives the exact image and command.
  3. Wait for the download. The weights are fetched on the machine; tens of gigabytes take a few minutes on a data-centre connection. You pay by the second from the moment it starts.
  4. Stop it when you are done. A running machine bills even when idle. A stopped one costs nothing per hour, though its disk is usually still billed until you delete it.
How to launch it

No Q4_K_M file of Qwen2.5-0.5B is catalogued here, so there is no exact command to vouch for. Start the machine from the llama.cpp server image ghcr.io/ggml-org/llama.cpp:server-cuda and point -hf at a Q4_K_M build from the publisher or a quantizer you trust — search Hugging Face for one. Check its file size against the memory figure on this page before you rent.

Every machine holds the whole model at Q4_K_M and 8,192 tokens of context, no offload. Speeds are this site’s single-stream decode estimates; prices are what each provider’s own API quoted, on-demand, for the whole machine. Vast hosts below 98% measured reliability are left out.

Referral links Vast.ai, RunPod and Novita pay us a share of what you spend if you sign up through these buttons. It costs you nothing, and it never decides an order or a recommendation: both are computed from the live price and the speed, and options that pay us nothing are listed and recommended on the same terms. How we rank

Buying a card instead, or paying by the token? Compare a year of Qwen2.5-0.5B three ways →

Under the hood

Architecture, read from the publisher’s file

The numbers every figure above is computed from, with the file they came from.

Architecture

✓ Architecture read from the published config.json

Retrieved 2026-09-20 at pinned commit 060db6499f32; parameter count from the safetensors index at the same revision.

Architecture
qwen2
Layers
24
Hidden size
896
Attention heads
14
KV heads
2
Feed-forward width
4,864
Vocabulary
151,936
Context ceiling
32,768
Sliding window
32,768
RoPE theta
1,000,000

Where the memory goes

tokenembedding× 24 decoder blocksGrouped-query attention14 query · 2 KV headswindow 32,768Feed-forwardone networkall activeoutputprojectiongrows with contextfixed per token

Grouped-query attention shares each key/value head across 7 query heads, so the KV cache is 14% of what multi-head attention would need at the same context.

Open the exact official config.json ↗

Qwen2.5-0.5B, card by card

One page per device: whether Qwen2.5-0.5B fits, at which formats, and how fast.

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Use this answer in your own product

As JSON, from the API
curl -s https://llmbottleneck.com/v1/analyze \
  -H "Authorization: Bearer $LLMB_KEY" -H "content-type: application/json" \
  -d '{"model":"qwen-qwen2-5-0-5b","quantization":"Q4_K_M","context":8192,"hardware":"nvidia-geforce-rtx-4090"}'

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On your page, as a widget
<script src="https://llmbottleneck.com/widget.js"
  data-model="qwen-qwen2-5-0-5b" data-quantization="Q4_K_M"
  data-hardware="nvidia-geforce-rtx-4090" data-context="8192"></script>

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Citing this page

LLM Bottleneck. “Qwen2.5-0.5B VRAM and hardware requirements.” Architecture from Qwen/Qwen2.5-0.5B at revision 060db6499f32, retrieved 2026-09-20. https://llmbottleneck.com/models/qwen-qwen2-5-0-5b

Every figure above is either the published value or a reconstruction whose measured error is on the accuracy page.

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catalogue 2026-10-03models 327devices 135