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RTX 3070 8GB vs RTX 3080 10GB for Local LLMs

The RTX 3080 10GB has about 70% more memory bandwidth (760 vs 448 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 70% faster on the RTX 3080 10GB. Both fit the same number of catalog models at Q4/8K (17 of 61; 8 vs 10 GB VRAM). MSRP is $499 for the RTX 3070 8GB vs $699 for the RTX 3080 10GB. 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 (38 shared models), the RTX 3080 10GB posts the higher tok/s in 38 rows vs 0. Methodology.

Spec comparison

RTX 3070 8GBRTX 3080 10GB
VendorNVIDIANVIDIA
VRAM8 GB10 GB
Memory typeGDDR6GDDR6X
Memory bandwidth448 GB/s760 GB/s
TDP220 W320 W
MSRP (list)$499$699
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 38 shared models

ModelParams (B)RTX 3070 8GB tok/sRTX 3070 8GB fitsRTX 3080 10GB tok/sRTX 3080 10GB fitsWinner
Qwen3-0.6B0.8356.4 est.Yes604.5 est.YesRTX 3080 10GB
gemma-3-1b-it1.0285.1 est.Yes483.6 est.YesRTX 3080 10GB
Llama-3.2-1B-Instruct1.2237.6 est.Yes403.0 est.YesRTX 3080 10GB
Qwen3-1.7B2.0142.5 est.Yes241.8 est.YesRTX 3080 10GB
gpt-oss-20b21.578.9 est.No209.1 est.NoRTX 3080 10GB
Llama-3.2-3B-Instruct3.289.1 est.Yes151.1 est.YesRTX 3080 10GB
Qwen3-30B-A3B30.551.4 est.No136.3 est.NoRTX 3080 10GB
Qwen3-Coder-30B-A3B-Instruct30.551.4 est.No136.3 est.NoRTX 3080 10GB
Qwen3-30B-A3B-Instruct-250730.551.4 est.No136.3 est.NoRTX 3080 10GB
GLM-4.7-Flash31.249.4 est.No130.9 est.NoRTX 3080 10GB
Phi-4-mini-instruct3.875.0 est.Yes127.3 est.YesRTX 3080 10GB
Phi-4-mini-reasoning3.875.0 est.Yes127.3 est.YesRTX 3080 10GB
gemma-3-4b-it4.373.1 est.Yes124.0 est.YesRTX 3080 10GB
Qwen3-4B-Instruct-25074.071.3 est.Yes120.9 est.YesRTX 3080 10GB
Qwen3-4B-Thinking-25074.071.3 est.Yes120.9 est.YesRTX 3080 10GB

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 3070 8GBRTX 3080 10GB
Catalog models that fit17 of 6117 of 61
Largest exclusive fit——

RTX 3070 8GB details → · RTX 3080 10GB details →