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RTX 4070 Super 12GB vs RX 7600 XT 16GB for Local LLMs

The RTX 4070 Super 12GB has about 75% more memory bandwidth (504 vs 288 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 75% faster on the RTX 4070 Super 12GB. The RX 7600 XT 16GB fits more of the catalog at Q4/8K — 25 vs 18 of 61 models (16 vs 12 GB VRAM). Largest model that fits the RX 7600 XT 16GB but not the RTX 4070 Super 12GB: gpt-oss-20b (21.5B). MSRP is $599 for the RTX 4070 Super 12GB vs $329 for the RX 7600 XT 16GB. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. In the Q4/8K head-to-head below (40 shared models), the RTX 4070 Super 12GB posts the higher tok/s in 25 rows vs 15. Methodology.

Spec comparison

RTX 4070 Super 12GBRX 7600 XT 16GB
VendorNVIDIAAMD
VRAM12 GB16 GB
Memory typeGDDR6XGDDR6
Memory bandwidth504 GB/s288 GB/s
TDP220 W190 W
MSRP (list)$599$329
BuySearch Amazon (affiliate)Search Amazon (affiliate)

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)RTX 4070 Super 12GB tok/sRTX 4070 Super 12GB fitsRX 7600 XT 16GB tok/sRX 7600 XT 16GB fitsWinner
Qwen3-0.6B0.8400.9 est.Yes229.1 est.YesRTX 4070 Super 12GB
gemma-3-1b-it1.0320.7 est.Yes183.3 est.YesRTX 4070 Super 12GB
Llama-3.2-1B-Instruct1.2267.3 est.Yes152.7 est.YesRTX 4070 Super 12GB
gpt-oss-20b21.5199.6 est.No50.9 est.YesRTX 4070 Super 12GB
Qwen3-1.7B2.0160.4 est.Yes91.6 est.YesRTX 4070 Super 12GB
Qwen3-30B-A3B30.5130.2 est.No132.3 est.NoRX 7600 XT 16GB
Qwen3-Coder-30B-A3B-Instruct30.5130.2 est.No132.3 est.NoRX 7600 XT 16GB
Qwen3-30B-A3B-Instruct-250730.5130.2 est.No132.3 est.NoRX 7600 XT 16GB
GLM-4.7-Flash31.2125.0 est.No127.0 est.NoRX 7600 XT 16GB
Llama-3.2-3B-Instruct3.2100.2 est.Yes57.3 est.YesRTX 4070 Super 12GB
Phi-4-mini-instruct3.884.4 est.Yes48.2 est.YesRTX 4070 Super 12GB
Phi-4-mini-reasoning3.884.4 est.Yes48.2 est.YesRTX 4070 Super 12GB
gemma-3-4b-it4.382.2 est.Yes47.0 est.YesRTX 4070 Super 12GB
Qwen3-4B-Instruct-25074.080.2 est.Yes45.8 est.YesRTX 4070 Super 12GB
Qwen3-4B-Thinking-25074.080.2 est.Yes45.8 est.YesRTX 4070 Super 12GB

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

RTX 4070 Super 12GBRX 7600 XT 16GB
Catalog models that fit18 of 6125 of 61
Largest exclusive fit—gpt-oss-20b (21.5B)

RTX 4070 Super 12GB details → · RX 7600 XT 16GB details →