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MI300X 192GB vs RTX 4090D 24GB (China) for Local LLMs

The MI300X 192GB has about 426% more memory bandwidth (5,300 vs 1,008 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 426% faster on the MI300X 192GB. The MI300X 192GB fits more of the catalog at Q4/8K — 50 vs 33 of 61 models (192 vs 24 GB VRAM). Largest model that fits the MI300X 192GB but not the RTX 4090D 24GB (China): Qwen3-235B-A22B (235.1B). MSRP is $15,000 for the MI300X 192GB vs $1,599 for the RTX 4090D 24GB (China). MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: MI300X 192GB, RTX 4090D 24GB (China) (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (47 shared models), the MI300X 192GB posts the higher tok/s in 47 rows vs 0. Methodology.

Spec comparison

MI300X 192GBRTX 4090D 24GB (China)
VendorAMDNVIDIA
VRAM192 GB24 GB
Memory typeHBM3GDDR6X
Memory bandwidth5,300 GB/s1,008 GB/s
TDP750 W425 W
MSRP (list)$15,000$1,599
Buy——

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 47 shared models

ModelParams (B)MI300X 192GB tok/sMI300X 192GB fitsRTX 4090D 24GB (China) tok/sRTX 4090D 24GB (China) fitsWinner
Qwen3-0.6B0.84215.9 est.Yes801.8 est.YesMI300X 192GB
gemma-3-1b-it1.03372.7 est.Yes641.5 est.YesMI300X 192GB
Llama-3.2-1B-Instruct1.22810.6 est.Yes534.5 est.YesMI300X 192GB
Qwen3-1.7B2.01686.4 est.Yes320.7 est.YesMI300X 192GB
Qwen3-30B-A3B30.51124.2 est.Yes213.8 est.YesMI300X 192GB
Qwen3-Coder-30B-A3B-Instruct30.51124.2 est.Yes213.8 est.YesMI300X 192GB
GLM-4.7-Flash31.21124.2 est.Yes213.8 est.YesMI300X 192GB
Qwen3-30B-A3B-Instruct-250730.51124.2 est.Yes213.8 est.YesMI300X 192GB
Qwen3-Next-80B-A3B-Instruct81.31124.2 est.Yes164.0 est.NoMI300X 192GB
Qwen3-Coder-Next79.71124.2 est.Yes170.4 est.NoMI300X 192GB
Llama-3.2-3B-Instruct3.21054.0 est.Yes200.5 est.YesMI300X 192GB
gpt-oss-20b21.5936.9 est.Yes178.2 est.YesMI300X 192GB
Phi-4-mini-instruct3.8887.6 est.Yes168.8 est.YesMI300X 192GB
Phi-4-mini-reasoning3.8887.6 est.Yes168.8 est.YesMI300X 192GB
gemma-3-4b-it4.3864.8 est.Yes164.5 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 4090D 24GB (China)
Catalog models that fit50 of 6133 of 61
Largest exclusive fitQwen3-235B-A22B (235.1B)—

MI300X 192GB details → · RTX 4090D 24GB (China) details →