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Can my GPU run it? VRAM calculator

Pick a 2026 model, a quant and your GPU. We show the memory the weights need and whether they fit, with the math shown, then link real measured speeds.

The formula

weights (GB) = parameters (billions) × bits-per-weight ÷ 8
fits if weights + headroom ≤ VRAM
Bits-per-weight for each GGUF quant are llama.cpp's own measured values (llama.cpp quantize README): Q8_0 8.50, Q6_K 6.56, Q5_K_M 5.70, Q4_K_M 4.89, Q3_K_M 4.00, Q2_K 3.16. Real files vary slightly by model. For MoE models all experts must sit in memory (or be offloaded to system RAM), but speed depends mostly on the active parameters.
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Referral link: if you sign up with Google and add $10, Runpod gives you and RigBase bonus credit (terms). It never affects our data.

Weights size by quant (GB)

ModelParamsQ6_KQ5_K_MQ4_K_MQ3_K_MParam source
Qwen3.8 27B27B22.219.216.513.5Ollama library tag 27b (nominal)
Qwen3.6 35B-A3B35.51B (3B active)29.125.321.717.7GGUF param count via llamabench.ai; 3B active per name
Qwen3.6 27B27.32B22.419.516.713.6GGUF param count via llamabench.ai
Gemma 4 31B30.7B25.221.918.815.3GGUF param count via llamabench.ai
Gemma 4 26B-A4B25.23B (4B active)20.718.015.412.6GGUF param count via llamabench.ai
Gemma 4 12B11.91B9.88.57.35.9GGUF param count via llamabench.ai
gpt-oss 20B20.91B (3.6B active)17.214.912.810.4GGUF param count via llamabench.ai (OpenAI model card: 21B total, 3.6B active)
gpt-oss 120B117B (5.1B active)96.083.471.658.4OpenAI model card: 117B total, 5.1B active
Qwen3.5 9B8.95B7.36.45.54.5GGUF param count via llamabench.ai
Qwen3.5 122B122B100.187.074.660.9Ollama library tag 122b (nominal)
LFM2.5 24B-A2B23.97B (2.45B active)19.717.114.712.0via llamabench.ai
Nemotron 3.5 Bolt 74B-A9B74.04B (9B active)60.752.845.337.0via llamabench.ai
Nemotron 3 Super 120B-A12B120B (12B active)98.485.673.459.9Ollama library: 120B, 12B active
Nemotron 3.5 Super VL 120B-A12B120B (12B active)98.485.673.459.9NVIDIA launch blog (15 Oct 2026): 120B params; 12B active per model name
Mistral Medium 3.5 128B128B105.091.378.363.9Ollama library: 128B weights
Devstral Small 2 24B24B19.717.114.712.0Ollama library tag 24b
Muse Spark Open 816B-A42B816B (42B active)669.5581.8499.2407.6Hugging Face launch post: ~816B total, ~42B active
GLM-5.3753B617.8536.9460.7376.1Hugging Face listing: 753B
DeepSeek R1 671B671B (37B active)550.5478.4410.5335.2Ollama library: 671B total, 37B active (V3 base)
Llama 3.3 70B (older)70B57.449.942.835.0Ollama library tag 70b
Llama 3.1 8B (older)8B6.65.74.94.0Ollama library tag 8b
Qwen3.8 Flash-Next180B (6B active)147.7128.3110.189.9~180B total per the model card as summarised by strata→signal (125B main network, ~6B active per token, 51B lookup table, 4B draft head)
Nemotron 3.5 Lightning 30B-A3B30B (3B active)24.621.418.415.030B total / 3B active MoE (hybrid Mamba), per DGX Spark benchmark table
Flint 40B-A2.5B39.8B (2.5B active)32.728.424.319.939.8B total / ~2.5B active MoE coding model (Recursive, Apache 2.0), per Hugging Face model card
GLM-5.3 Flash320B (18B active)262.5228.1195.8159.8Z.ai model card: 320B total, 18B active (Hugging Face lists 321B)
Ornith 1.5 122B125.1B (10B active)102.689.276.562.5Hugging Face: 125B incl. vision tower + MTP layer (122B language model, 10B active per halt95/Ornith-1.5-122B-A10B card)
DeepSeek V4.1 Flash748.6B (16B active)614.2533.7458.0373.9vLLM recipe: 552B backbone + 196.6B Engram tables, 16B active per output token; official MXFP4/FP8 checkpoint ~511 GB
GLM-5.2753.3B618.0537.1460.9376.3Hugging Face safetensors total: 753.3B parameters (MoE; the model card does not state the active count)
Ornith 1.5 35B-A3B35.95B (3B active)29.525.622.018.0Hugging Face safetensors total: 35.95B; model card: activates ~3B parameters per token

gpt-oss ships natively in MXFP4; OpenAI's card says gpt-oss-120b runs on a single 80 GB GPU and gpt-oss-20b within 16 GB of memory.