RTX 3080 10GB vs Titan Xp 12GB for Local LLMs

The RTX 3080 10GB has about 39% more memory bandwidth (760 vs 548 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 39% faster on the RTX 3080 10GB. The Titan Xp 12GB fits more of the catalog at Q4/8K — 18 vs 17 of 69 models (12 vs 10 GB VRAM). Largest model that fits the Titan Xp 12GB but not the RTX 3080 10GB: OLMo-2-1124-13B-Instruct (13.7B). MSRP is $699 for the RTX 3080 10GB vs $1,200 for the Titan Xp 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 (39 shared models), the Titan Xp 12GB posts the higher tok/s in 21 rows vs 18. Methodology.

Spec comparison

	RTX 3080 10GB	Titan Xp 12GB
Vendor	NVIDIA	NVIDIA
VRAM	10 GB	12 GB
Memory type	GDDR6X	GDDR5X
Memory bandwidth	760 GB/s	548 GB/s
TDP	320 W	250 W
MSRP (list)	$699	$1,200
Buy	Search 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 39 shared models

Model	Params (B)	RTX 3080 10GB tok/s	RTX 3080 10GB fits	Titan Xp 12GB tok/s	Titan Xp 12GB fits	Winner
MiniCPM5-1B	1.08	447.8 est.	Yes	322.9 est.	Yes	RTX 3080 10GB
Qwen3.5-2B	2.0	241.8 est.	Yes	174.4 est.	Yes	RTX 3080 10GB
gpt-oss-20b	21.5	208.0 est.	No	216.2 est.	No	Titan Xp 12GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	210.3 est.	Yes	151.6 est.	Yes	RTX 3080 10GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	149.1 est.	No	155.0 est.	No	Titan Xp 12GB
gemma-4-26B-A4B-it	25.2	148.3 est.	No	154.1 est.	No	Titan Xp 12GB
Llama-3.2-3B-Instruct	3.2	151.1 est.	Yes	109.0 est.	Yes	RTX 3080 10GB
Qwen3-30B-A3B-Instruct-2507	30.5	135.7 est.	No	141.0 est.	No	Titan Xp 12GB
GLM-4.7-Flash	31.2	130.2 est.	No	135.3 est.	No	Titan Xp 12GB
Qwen3-4B-Instruct-2507	4.0	120.9 est.	Yes	87.2 est.	Yes	RTX 3080 10GB
NVIDIA-Nemotron-3-Nano-4B-BF16	4.0	120.9 est.	Yes	87.2 est.	Yes	RTX 3080 10GB
Qwen3-4B-Thinking-2507	4.0	120.9 est.	Yes	87.2 est.	Yes	RTX 3080 10GB
Qwen3.5-35B-A3B	34.7	112.8 est.	No	117.2 est.	No	Titan Xp 12GB
qwen35b-a3b-fable-sft-abliterated	34.7	107.1 est.	No	111.3 est.	No	Titan Xp 12GB
Ornith-1.0-35B	35.0	105.4 est.	No	109.6 est.	No	Titan Xp 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 3080 10GB	Titan Xp 12GB
Catalog models that fit	17 of 69	18 of 69
Largest exclusive fit	—	OLMo-2-1124-13B-Instruct (13.7B)

RTX 3080 10GB details → · Titan Xp 12GB details →