RTX 5080 16GB vs Titan X Pascal 12GB for Local LLMs

The RTX 5080 16GB has about 100% more memory bandwidth (960 vs 480 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 100% faster on the RTX 5080 16GB. The RTX 5080 16GB fits more of the catalog at Q4/8K — 24 vs 18 of 69 models (16 vs 12 GB VRAM). Largest model that fits the RTX 5080 16GB but not the Titan X Pascal 12GB: gemma-4-26B-A4B-it (25.2B). MSRP is $999 for the RTX 5080 16GB vs $1,200 for the Titan X Pascal 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 (41 shared models), the RTX 5080 16GB posts the higher tok/s in 38 rows vs 3. Methodology.

Spec comparison

	RTX 5080 16GB	Titan X Pascal 12GB
Vendor	NVIDIA	NVIDIA
VRAM	16 GB	12 GB
Memory type	GDDR7	GDDR5X
Memory bandwidth	960 GB/s	480 GB/s
TDP	360 W	250 W
MSRP (list)	$999	$1,200
Buy	NVIDIA GeForce RTX 5080 Founders Edition (affiliate) · More listings	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 41 shared models

Model	Params (B)	RTX 5080 16GB tok/s	RTX 5080 16GB fits	Titan X Pascal 12GB tok/s	Titan X Pascal 12GB fits	Winner
MiniCPM5-1B	1.08	565.7 est.	Yes	282.8 est.	Yes	RTX 5080 16GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	483.2 est.	No	135.8 est.	No	RTX 5080 16GB
Qwen3-30B-A3B-Instruct-2507	30.5	439.5 est.	No	123.5 est.	No	RTX 5080 16GB
GLM-4.7-Flash	31.2	421.9 est.	No	118.5 est.	No	RTX 5080 16GB
Qwen3.5-35B-A3B	34.7	365.3 est.	No	102.6 est.	No	RTX 5080 16GB
qwen35b-a3b-fable-sft-abliterated	34.7	346.9 est.	No	97.5 est.	No	RTX 5080 16GB
Ornith-1.0-35B	35.0	341.6 est.	No	96.0 est.	No	RTX 5080 16GB
Qwen3.6-35B-A3B	36.0	340.6 est.	No	95.7 est.	No	RTX 5080 16GB
Qwen3.5-2B	2.0	305.5 est.	Yes	152.7 est.	Yes	RTX 5080 16GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	265.6 est.	Yes	132.8 est.	Yes	RTX 5080 16GB
gpt-oss-20b	21.5	204.9 measured	Yes	189.3 est.	No	RTX 5080 16GB
Llama-3.2-3B-Instruct	3.2	190.9 est.	Yes	95.5 est.	Yes	RTX 5080 16GB
Mistral-7B-Instruct-v0.3	7.2	163.6 measured	Yes	42.4 est.	Yes	RTX 5080 16GB
gemma-4-26B-A4B-it	25.2	160.8 est.	Yes	135.0 est.	No	RTX 5080 16GB
Qwen3-4B-Instruct-2507	4.0	152.7 est.	Yes	76.4 est.	Yes	RTX 5080 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 5080 16GB	Titan X Pascal 12GB
Catalog models that fit	24 of 69	18 of 69
Largest exclusive fit	gemma-4-26B-A4B-it (25.2B)	—

RTX 5080 16GB details → · Titan X Pascal 12GB details →