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RTX 4080 Super 16GB vs RTX 5070 12GB for Local LLMs

The RTX 4080 Super 16GB has about 10% more memory bandwidth (736 vs 672 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 10% faster on the RTX 4080 Super 16GB. The RTX 4080 Super 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 RTX 4080 Super 16GB but not the RTX 5070 12GB: gpt-oss-20b (21.5B). MSRP is $999 for the RTX 4080 Super 16GB vs $549 for the RTX 5070 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 4080 Super 16GB posts the higher tok/s in 31 rows vs 9. Methodology.

Spec comparison

RTX 4080 Super 16GBRTX 5070 12GB
VendorNVIDIANVIDIA
VRAM16 GB12 GB
Memory typeGDDR6XGDDR7
Memory bandwidth736 GB/s672 GB/s
TDP320 W250 W
MSRP (list)$999$549
BuyASUS ProArt GeForce RTX 4080 Super OC (affiliate) · More listingsSearch 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 4080 Super 16GB tok/sRTX 4080 Super 16GB fitsRTX 5070 12GB tok/sRTX 5070 12GB fitsWinner
Qwen3-0.6B0.8585.5 est.Yes534.5 est.YesRTX 4080 Super 16GB
gemma-3-1b-it1.0468.4 est.Yes427.6 est.YesRTX 4080 Super 16GB
Llama-3.2-1B-Instruct1.2390.3 est.Yes356.4 est.YesRTX 4080 Super 16GB
Qwen3-30B-A3B30.5338.0 est.No173.6 est.NoRTX 4080 Super 16GB
Qwen3-Coder-30B-A3B-Instruct30.5338.0 est.No173.6 est.NoRTX 4080 Super 16GB
Qwen3-30B-A3B-Instruct-250730.5338.0 est.No173.6 est.NoRTX 4080 Super 16GB
GLM-4.7-Flash31.2324.5 est.No166.6 est.NoRTX 4080 Super 16GB
gpt-oss-20b21.5186.5 measuredYes266.2 est.NoRTX 5070 12GB
Qwen3-1.7B2.0234.2 est.Yes213.8 est.YesRTX 4080 Super 16GB
Llama-3.2-3B-Instruct3.2146.4 est.Yes133.6 est.YesRTX 4080 Super 16GB
Phi-4-mini-instruct3.8123.3 est.Yes112.5 est.YesRTX 4080 Super 16GB
Phi-4-mini-reasoning3.8123.3 est.Yes112.5 est.YesRTX 4080 Super 16GB
Mistral-7B-Instruct-v0.37.265.0 measuredYes120.5 measuredYesRTX 5070 12GB
gemma-3-4b-it4.3120.1 est.Yes109.7 est.YesRTX 4080 Super 16GB
Qwen3-4B-Instruct-25074.0117.1 est.Yes106.9 est.YesRTX 4080 Super 16GB

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 4080 Super 16GBRTX 5070 12GB
Catalog models that fit25 of 6118 of 61
Largest exclusive fitgpt-oss-20b (21.5B)—

RTX 4080 Super 16GB details → · RTX 5070 12GB details →