Warning: 96GB 4090 and 5090 cards are scams
💡Don't lose money on fake hardware; verify your GPU sources for local LLM setups.
⚡ 30-Second TL;DR
What Changed
96GB 4090 and 5090 cards are non-existent fraudulent products.
Why It Matters
Practitioners risk significant financial loss and hardware failure by purchasing unverified modified GPUs. This highlights the growing desperation for high-VRAM solutions in the local LLM community.
What To Do Next
Avoid purchasing 'custom' high-VRAM 4090/5090 cards from unverified third-party sellers on marketplaces.
Key Points
- •96GB 4090 and 5090 cards are non-existent fraudulent products.
- •Vendors are preying on AI practitioners' need for high-VRAM local inference hardware.
- •Verified hardware experts confirm no such modified PCB production exists.
🧠 Deep Insight
AI-generated analysis for this event — not the original article.
🔑 Enhanced Key Takeaways
- •These fraudulent cards typically utilize 'VRAM spoofing' firmware, where the BIOS is modified to report 96GB to the OS while physically containing only 24GB of VRAM.
- •The scam often involves re-soldering GDDR6X chips from donor boards or using lower-speed, unstable memory modules that fail immediately under heavy LLM inference workloads.
- •Marketplace platforms like AliExpress and eBay have become primary vectors for these listings, often using stock photos of professional workstation cards (like the RTX 6000 Ada) to deceive buyers.
- •Hardware teardowns reveal that these cards often lack the necessary power delivery phases (VRMs) to support the increased memory density they claim to possess.
- •NVIDIA's official consumer architecture for the RTX 4090 and 5090 series is physically limited by memory controller addressing, making a 96GB configuration impossible without a complete redesign of the GPU silicon.
🛠️ Technical Deep Dive
- Memory Controller Limitation: The AD102 (4090) and GB202 (5090) silicon are designed with a 384-bit memory bus, which natively supports 24GB or 48GB configurations, not 96GB.
- Firmware Spoofing: Scammers modify the card's EEPROM to report a higher memory capacity to the NVIDIA driver, which leads to 'Out of Memory' (OOM) errors or system crashes as soon as the actual physical memory limit is exceeded.
- PCB Incompatibility: Consumer RTX 40/50 series PCBs lack the physical trace routing and memory controller lanes required to address 96GB of VRAM, which is a feature reserved for enterprise-grade cards like the RTX 6000 Ada or H100/B200 series.
🔮 Future ImplicationsAI analysis grounded in cited sources
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Original source: Reddit r/LocalLLaMA ↗
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