L40S 48GB vs Titan Xp 12GB for Local LLMs

The L40S 48GB has about 58% more memory bandwidth (864 vs 548 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 58% faster on the L40S 48GB. The L40S 48GB fits more of the catalog at Q4/8K — 41 vs 18 of 69 models (48 vs 12 GB VRAM). Largest model that fits the L40S 48GB but not the Titan Xp 12GB: Qwen3-Next-80B-A3B-Instruct (81.3B). MSRP is $8,000 for the L40S 48GB 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 (41 shared models), the L40S 48GB posts the higher tok/s in 35 rows vs 6. Methodology.

Spec comparison

	L40S 48GB	Titan Xp 12GB
Vendor	NVIDIA	NVIDIA
VRAM	48 GB	12 GB
Memory type	GDDR6	GDDR5X
Memory bandwidth	864 GB/s	548 GB/s
TDP	350 W	250 W
MSRP (list)	$8,000	$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 41 shared models

Model	Params (B)	L40S 48GB tok/s	L40S 48GB fits	Titan Xp 12GB tok/s	Titan Xp 12GB fits	Winner
MiniCPM5-1B	1.08	509.1 est.	Yes	322.9 est.	Yes	L40S 48GB
Qwen3.5-2B	2.0	274.9 est.	Yes	174.4 est.	Yes	L40S 48GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	239.1 est.	Yes	151.6 est.	Yes	L40S 48GB
gpt-oss-20b	21.5	152.7 est.	Yes	216.2 est.	No	Titan Xp 12GB
Qwen3.6-35B-A3B	36.0	183.3 est.	Yes	109.2 est.	No	L40S 48GB
Qwen3.5-35B-A3B	34.7	183.3 est.	Yes	117.2 est.	No	L40S 48GB
GLM-4.7-Flash	31.2	183.3 est.	Yes	135.3 est.	No	L40S 48GB
Qwen3-30B-A3B-Instruct-2507	30.5	183.3 est.	Yes	141.0 est.	No	L40S 48GB
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	183.3 est.	Yes	155.0 est.	No	L40S 48GB
Qwen3-Coder-Next	79.7	183.3 est.	Yes	23.6 est.	No	L40S 48GB
Ornith-1.0-35B	35.0	183.3 est.	Yes	109.6 est.	No	L40S 48GB
Qwen3-Next-80B-A3B-Instruct	81.3	183.3 est.	Yes	22.7 est.	No	L40S 48GB
qwen35b-a3b-fable-sft-abliterated	34.7	183.3 est.	Yes	111.3 est.	No	L40S 48GB
Llama-3.2-3B-Instruct	3.2	171.8 est.	Yes	109.0 est.	Yes	L40S 48GB
gemma-4-26B-A4B-it	25.2	144.7 est.	Yes	154.1 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

	L40S 48GB	Titan Xp 12GB
Catalog models that fit	41 of 69	18 of 69
Largest exclusive fit	Qwen3-Next-80B-A3B-Instruct (81.3B)	—

L40S 48GB details → · Titan Xp 12GB details →