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RTX 4070 Super 12GB vs RX 7700 XT 12GB for Local LLMs

The RTX 4070 Super 12GB has about 17% more memory bandwidth (504 vs 432 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 17% faster on the RTX 4070 Super 12GB. Both fit the same number of catalog models at Q4/8K (18 of 61; 12 vs 12 GB VRAM). MSRP is $599 for the RTX 4070 Super 12GB vs $449 for the RX 7700 XT 12GB. 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 40 rows vs 0. Methodology.

Spec comparison

RTX 4070 Super 12GBRX 7700 XT 12GB
VendorNVIDIAAMD
VRAM12 GB12 GB
Memory typeGDDR6XGDDR6
Memory bandwidth504 GB/s432 GB/s
TDP220 W245 W
MSRP (list)$599$449
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 7700 XT 12GB tok/sRX 7700 XT 12GB fitsWinner
Qwen3-0.6B0.8400.9 est.Yes343.6 est.YesRTX 4070 Super 12GB
gemma-3-1b-it1.0320.7 est.Yes274.9 est.YesRTX 4070 Super 12GB
Llama-3.2-1B-Instruct1.2267.3 est.Yes229.1 est.YesRTX 4070 Super 12GB
gpt-oss-20b21.5199.6 est.No171.1 est.NoRTX 4070 Super 12GB
Qwen3-1.7B2.0160.4 est.Yes137.5 est.YesRTX 4070 Super 12GB
Qwen3-30B-A3B30.5130.2 est.No111.6 est.NoRTX 4070 Super 12GB
Qwen3-Coder-30B-A3B-Instruct30.5130.2 est.No111.6 est.NoRTX 4070 Super 12GB
Qwen3-30B-A3B-Instruct-250730.5130.2 est.No111.6 est.NoRTX 4070 Super 12GB
GLM-4.7-Flash31.2125.0 est.No107.1 est.NoRTX 4070 Super 12GB
Llama-3.2-3B-Instruct3.2100.2 est.Yes85.9 est.YesRTX 4070 Super 12GB
Phi-4-mini-instruct3.884.4 est.Yes72.3 est.YesRTX 4070 Super 12GB
Phi-4-mini-reasoning3.884.4 est.Yes72.3 est.YesRTX 4070 Super 12GB
gemma-3-4b-it4.382.2 est.Yes70.5 est.YesRTX 4070 Super 12GB
Qwen3-4B-Instruct-25074.080.2 est.Yes68.7 est.YesRTX 4070 Super 12GB
Qwen3-4B-Thinking-25074.080.2 est.Yes68.7 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 7700 XT 12GB
Catalog models that fit18 of 6118 of 61
Largest exclusive fit——

RTX 4070 Super 12GB details → · RX 7700 XT 12GB details →