← AI Hashrate

RTX 4070 Super 12GB vs RTX 4080 Super 16GB for Local LLMs

The RTX 4080 Super 16GB has about 46% more memory bandwidth (736 vs 504 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 46% 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 4070 Super 12GB: gpt-oss-20b (21.5B). MSRP is $599 for the RTX 4070 Super 12GB vs $999 for the RTX 4080 Super 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 4080 Super 16GB posts the higher tok/s in 33 rows vs 7. Methodology.

Spec comparison

RTX 4070 Super 12GBRTX 4080 Super 16GB
VendorNVIDIANVIDIA
VRAM12 GB16 GB
Memory typeGDDR6XGDDR6X
Memory bandwidth504 GB/s736 GB/s
TDP220 W320 W
MSRP (list)$599$999
BuySearch Amazon (affiliate)ASUS ProArt GeForce RTX 4080 Super 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)RTX 4070 Super 12GB tok/sRTX 4070 Super 12GB fitsRTX 4080 Super 16GB tok/sRTX 4080 Super 16GB fitsWinner
Qwen3-0.6B0.8400.9 est.Yes585.5 est.YesRTX 4080 Super 16GB
gemma-3-1b-it1.0320.7 est.Yes468.4 est.YesRTX 4080 Super 16GB
Llama-3.2-1B-Instruct1.2267.3 est.Yes390.3 est.YesRTX 4080 Super 16GB
Qwen3-30B-A3B30.5130.2 est.No338.0 est.NoRTX 4080 Super 16GB
Qwen3-Coder-30B-A3B-Instruct30.5130.2 est.No338.0 est.NoRTX 4080 Super 16GB
Qwen3-30B-A3B-Instruct-250730.5130.2 est.No338.0 est.NoRTX 4080 Super 16GB
GLM-4.7-Flash31.2125.0 est.No324.5 est.NoRTX 4080 Super 16GB
Qwen3-1.7B2.0160.4 est.Yes234.2 est.YesRTX 4080 Super 16GB
gpt-oss-20b21.5199.6 est.No186.5 measuredYesRTX 4070 Super 12GB
Llama-3.2-3B-Instruct3.2100.2 est.Yes146.4 est.YesRTX 4080 Super 16GB
Phi-4-mini-instruct3.884.4 est.Yes123.3 est.YesRTX 4080 Super 16GB
Phi-4-mini-reasoning3.884.4 est.Yes123.3 est.YesRTX 4080 Super 16GB
gemma-3-4b-it4.382.2 est.Yes120.1 est.YesRTX 4080 Super 16GB
Qwen3-4B-Instruct-25074.080.2 est.Yes117.1 est.YesRTX 4080 Super 16GB
Qwen3-4B-Thinking-25074.080.2 est.Yes117.1 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 4070 Super 12GBRTX 4080 Super 16GB
Catalog models that fit18 of 6125 of 61
Largest exclusive fit—gpt-oss-20b (21.5B)

RTX 4070 Super 12GB details → · RTX 4080 Super 16GB details →