RX 7700 XT 12GB vs V100 16GB PCIe for Local LLMs

The V100 16GB PCIe has about 108% more memory bandwidth (900 vs 432 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 108% faster on the V100 16GB PCIe. The V100 16GB PCIe fits more of the catalog at Q4/8K — 25 vs 21 of 73 models (16 vs 12 GB VRAM). Largest model that fits the V100 16GB PCIe but not the RX 7700 XT 12GB: gemma-4-26B-A4B-it (25.2B). MSRP is $449 for the RX 7700 XT 12GB vs $8,000 for the V100 16GB PCIe. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: V100 16GB PCIe (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (46 shared models), the V100 16GB PCIe posts the higher tok/s in 46 rows vs 0. Methodology.

Spec comparison

	RX 7700 XT 12GB	V100 16GB PCIe
Vendor	AMD	NVIDIA
VRAM	12 GB	16 GB
Memory type	GDDR6	HBM2
Memory bandwidth	432 GB/s	900 GB/s
TDP	245 W	250 W
MSRP (list)	$449	$8,000
Buy	Search Amazon · eBay · Newegg · B&H Photo	—

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 46 shared models

Model	Params (B)	RX 7700 XT 12GB tok/s	RX 7700 XT 12GB fits	V100 16GB PCIe tok/s	V100 16GB PCIe fits	Winner
MiniCPM5-1B	1.08	441.7 est.	Yes	895.6 est.	Yes	V100 16GB PCIe
Qwen3.5-2B	2.0	238.5 est.	Yes	483.6 est.	Yes	V100 16GB PCIe
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF16	30.0	117.0 est.	No	434.0 est.	No	V100 16GB PCIe
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx	2.3	207.4 est.	Yes	420.5 est.	Yes	V100 16GB PCIe
Qwen3-30B-A3B-Instruct-2507	30.5	109.3 est.	No	405.4 est.	No	V100 16GB PCIe
Qwen3.5-35B-A3B	34.7	91.6 est.	No	339.8 est.	No	V100 16GB PCIe
Ornith-1.0-35B	35.0	90.1 est.	No	334.2 est.	No	V100 16GB PCIe
qwen35b-a3b-fable-sft-abliterated	34.7	87.7 est.	No	325.2 est.	No	V100 16GB PCIe
Qwen3.6-35B-A3B	36.0	85.5 est.	No	316.9 est.	No	V100 16GB PCIe
GLM-4.7-Flash	31.2	84.4 est.	No	313.0 est.	No	V100 16GB PCIe
Llama-3.2-3B-Instruct	3.2	149.1 est.	Yes	302.3 est.	Yes	V100 16GB PCIe
gpt-oss-20b	21.5	184.8 est.	No	268.7 est.	Yes	V100 16GB PCIe
gemma-4-26B-A4B-it	25.2	128.8 est.	No	254.5 est.	Yes	V100 16GB PCIe
Qwen3-4B-Instruct-2507	4.0	119.3 est.	Yes	241.8 est.	Yes	V100 16GB PCIe
NVIDIA-Nemotron-3-Nano-4B-BF16	4.0	119.3 est.	Yes	241.8 est.	Yes	V100 16GB PCIe

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

	RX 7700 XT 12GB	V100 16GB PCIe
Catalog models that fit	21 of 73	25 of 73
Largest exclusive fit	—	gemma-4-26B-A4B-it (25.2B)

RX 7700 XT 12GB details → · V100 16GB PCIe details →