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RX 7900 XT 20GB vs V100 32GB SXM2 for Local LLMs

The V100 32GB SXM2 has about 12% more memory bandwidth (900 vs 800 GB/s). Batch-1 decode tracks bandwidth closely, so a model that fits both cards should decode roughly 12% faster on the V100 32GB SXM2. The V100 32GB SXM2 fits more of the catalog at Q4/8K — 43 vs 31 of 73 models (32 vs 20 GB VRAM). Largest model that fits the V100 32GB SXM2 but not the RX 7900 XT 20GB: Qwen3.6-35B-A3B-FP8 (36.0B). MSRP is $899 for the RX 7900 XT 20GB vs $10,000 for the V100 32GB SXM2. MSRP is a launch list price, not live retail — Amazon prices move; click through for the current price. Not retail-shoppable: V100 32GB SXM2 (datacenter-class; cloud rental is the realistic way to use it). In the Q4/8K head-to-head below (55 shared models), the V100 32GB SXM2 posts the higher tok/s in 44 rows vs 10. Methodology.

Spec comparison

RX 7900 XT 20GBV100 32GB SXM2
VendorAMDNVIDIA
VRAM20 GB32 GB
Memory typeGDDR6HBM2
Memory bandwidth800 GB/s900 GB/s
TDP315 W300 W
MSRP (list)$899$10,000
BuySearch 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 55 shared models

ModelParams (B)RX 7900 XT 20GB tok/sRX 7900 XT 20GB fitsV100 32GB SXM2 tok/sV100 32GB SXM2 fitsWinner
MiniCPM5-1B1.08554.6 est.Yes895.6 est.YesV100 32GB SXM2
Qwen3.5-2B2.0299.5 est.Yes483.6 est.YesV100 32GB SXM2
Qwen3.5-35B-A3B34.7472.2 est.No322.4 est.YesRX 7900 XT 20GB
Ornith-1.0-35B35.0464.4 est.No322.4 est.YesRX 7900 XT 20GB
qwen35b-a3b-fable-sft-abliterated34.7451.9 est.No322.4 est.YesRX 7900 XT 20GB
Qwen3.6-35B-A3B36.0440.3 est.No322.4 est.YesRX 7900 XT 20GB
GLM-4.7-Flash31.2434.9 est.No322.4 est.YesRX 7900 XT 20GB
DeepSeek-R1-0528-Qwen3-8B-layer-mix-bpw-3.8-mlx2.3260.4 est.Yes420.5 est.YesV100 32GB SXM2
Qwen3-30B-A3B-Instruct-250730.5199.7 est.Yes322.4 est.YesV100 32GB SXM2
Nemotron-3-Nano-Omni-30B-A3B-Reasoning-BF1630.0199.7 est.Yes322.4 est.YesV100 32GB SXM2
Llama-3.2-3B-Instruct3.2131.2 measuredYes302.3 est.YesV100 32GB SXM2
gpt-oss-20b21.5166.4 est.Yes268.7 est.YesV100 32GB SXM2
Qwen3-Coder-Next79.793.1 est.No268.3 est.NoV100 32GB SXM2
Qwen3-Next-80B-A3B-Instruct81.389.6 est.No258.2 est.NoV100 32GB SXM2
gemma-4-26B-A4B-it25.2157.6 est.Yes254.5 est.YesV100 32GB SXM2

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 7900 XT 20GBV100 32GB SXM2
Catalog models that fit31 of 7343 of 73
Largest exclusive fitQwen3.6-35B-A3B-FP8 (36.0B)

RX 7900 XT 20GB details → · V100 32GB SXM2 details →