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MI300X 192GB vs RTX 3060 12GB for Local LLMs

The MI300X 192GB has about 1372% more memory bandwidth (5,300 vs 360 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 1372% faster on the MI300X 192GB. The MI300X 192GB fits more of the catalog at Q4/8K — 50 vs 18 of 61 models (192 vs 12 GB VRAM). Largest model that fits the MI300X 192GB but not the RTX 3060 12GB: Qwen3-235B-A22B (235.1B). MSRP is $15,000 for the MI300X 192GB vs $329 for the RTX 3060 12GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: MI300X 192GB (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (40 shared models), the MI300X 192GB posts the higher tok/s in 40 rows vs 0. Methodology.

Spec comparison

MI300X 192GBRTX 3060 12GB
VendorAMDNVIDIA
VRAM192 GB12 GB
Memory typeHBM3GDDR6
Memory bandwidth5,300 GB/s360 GB/s
TDP750 W170 W
MSRP (list)$15,000$329
Buy—MSI GeForce RTX 3060 Ventus 2X 12G OC (affiliate) · More listings

MSRP is the launch list price, not live retail. Buy links are Amazon affiliate links — the price after you click is the live price.

Q4 / 8K head-to-head — top 15 of 40 shared models

ModelParams (B)MI300X 192GB tok/sMI300X 192GB fitsRTX 3060 12GB tok/sRTX 3060 12GB fitsWinner
Qwen3-0.6B0.84215.9 est.Yes286.4 est.YesMI300X 192GB
gemma-3-1b-it1.03372.7 est.Yes229.1 est.YesMI300X 192GB
Llama-3.2-1B-Instruct1.22810.6 est.Yes190.9 est.YesMI300X 192GB
Qwen3-1.7B2.01686.4 est.Yes114.5 est.YesMI300X 192GB
Qwen3-30B-A3B30.51124.2 est.Yes93.0 est.NoMI300X 192GB
Qwen3-Coder-30B-A3B-Instruct30.51124.2 est.Yes93.0 est.NoMI300X 192GB
GLM-4.7-Flash31.21124.2 est.Yes89.3 est.NoMI300X 192GB
Qwen3-30B-A3B-Instruct-250730.51124.2 est.Yes93.0 est.NoMI300X 192GB
Qwen3-Next-80B-A3B-Instruct81.31124.2 est.Yes14.6 est.NoMI300X 192GB
Qwen3-Coder-Next79.71124.2 est.Yes15.2 est.NoMI300X 192GB
Llama-3.2-3B-Instruct3.21054.0 est.Yes122.9 measuredYesMI300X 192GB
gpt-oss-20b21.5936.9 est.Yes84.0 measuredNoMI300X 192GB
Phi-4-mini-instruct3.8887.6 est.Yes60.3 est.YesMI300X 192GB
Phi-4-mini-reasoning3.8887.6 est.Yes60.3 est.YesMI300X 192GB
gemma-3-4b-it4.3864.8 est.Yes58.7 est.YesMI300X 192GB

est. = bandwidth-based estimate; measured = curated real benchmark that overrides the estimate. Fits = weights + KV(8K) + 1 GB overhead ≤ 95% of VRAM.

Fit coverage at Q4 / 8K

MI300X 192GBRTX 3060 12GB
Catalog models that fit50 of 6118 of 61
Largest exclusive fitQwen3-235B-A22B (235.1B)—

MI300X 192GB details → · RTX 3060 12GB details →