NVIDIA RTX 4090 48GB (China-mod)
No editorial image yet — generic vendor mark shown. Credentials in spec table below.
Third-party physical modification of a stock GIGABYTE / ASUS / MSI RTX 4090. Chinese specialty shops (and GPVLab in the US) replace the 24 GB of GDDR6X with higher-density 32 Gb chips, doubling on-card VRAM to 48 GB. Same AD102 GPU core, same 384-bit memory bus, same 1008 GB/s bandwidth as a stock 4090 — only the memory density changes.
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Sub-scores sum to 763 / 1000. Headline = 763 × 0.70 (Estimated-confidence discount) = 534. This is an algorithmic performance-tier score — distinct from, and often lower than, the editorial “Our verdict” below, which weighs value and real-world fit (especially for hardware we haven’t measured yet). How scoring works →
Extrapolated from 1008 GB/s bandwidth — 121.0 tok/s estimated. No measured benchmarks yet.
Plain-English: Runs 70B with care — snappy enough for a coding agent; vision models supported.
Verdicts extrapolated from catalog VRAM + bandwidth + ecosystem flags. Hover any chip for the rationale. Want measured numbers? Submit your own run with runlocalai-bench --submit.
Overview
Third-party physical modification of a stock GIGABYTE / ASUS / MSI RTX 4090. Chinese specialty shops (and GPVLab in the US) replace the 24 GB of GDDR6X with higher-density 32 Gb chips, doubling on-card VRAM to 48 GB. Same AD102 GPU core, same 384-bit memory bus, same 1008 GB/s bandwidth as a stock 4090 — only the memory density changes. The 48 GB capacity opens up workloads that the stock 4090 can't host: Llama 3.3 70B Q4 with comfortable context, dual-32B models in parallel, longer context windows on 32B-class models. **GamersNexus has covered the modification process** (youtube.com/watch?v=TcRGBeOENLg). Community sellers list on Taobao and Bilibili; GPVLab takes US/EU orders. Important caveats: not a vendor-blessed product. No NVIDIA warranty. Power draw and thermals match a stock 4090; operators commonly power-limit to 350 W to reduce noise and heat. Real-world benchmark data is community-reported and not yet in our editorial benchmark queue.
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Prefer it assembled?
If you would rather not build a PC around the NVIDIA RTX 4090 48GB (China-mod) yourself, a configured desktop is the alternative.
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Specs
| VRAM | 48 GB |
| Power draw (peak) | 450 W |
| Released | 2024 |
| Backends | CUDA Vulkan |
Models that fit
Open-weight models small enough to run on NVIDIA RTX 4090 48GB (China-mod) with usable context.
Frequently asked
What models can NVIDIA RTX 4090 48GB (China-mod) run?
Does NVIDIA RTX 4090 48GB (China-mod) support CUDA?
Where next?
Reviewed by RunLocalAI Editorial. See our editorial policy for how we research and verify hardware specifications.