๐ฆReddit r/LocalLLaMAโขFreshcollected in 6h
Warning: 96GB 4090 and 5090 cards are scams
๐กDon't lose money on fake hardware; verify your GPU sources for local LLM setups.
โก 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.
Who should care:Developers & AI Engineers
๐ง Deep Insight
AI-generated analysis for this event.
๐ Enhanced Key Takeaways
- โขThese 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.
- โขThe 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.
- โขMarketplace 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.
- โขHardware teardowns reveal that these cards often lack the necessary power delivery phases (VRMs) to support the increased memory density they claim to possess.
- โขNVIDIA'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.
๐ ๏ธ 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.
๐ฎ Future ImplicationsAI analysis grounded in cited sources
Increased adoption of hardware-level verification tools by the local LLM community.
As scams become more sophisticated, users will increasingly rely on open-source diagnostic tools like 'GPU-Z' or custom scripts to verify physical VRAM capacity before finalizing purchases.
Marketplace platforms will implement stricter listing requirements for high-end GPU hardware.
The prevalence of these scams is forcing major e-commerce platforms to require verified seller documentation for high-value electronics to mitigate fraud liability.
โณ Timeline
2023-10
Initial reports of 'Frankenstein' RTX 3060/4090 cards with modified VRAM appearing on secondary markets.
2024-05
Community warnings escalate as modified cards with spoofed BIOS versions become more common on international marketplaces.
2025-02
Widespread documentation of VRAM spoofing techniques by hardware enthusiasts on platforms like Reddit and YouTube.
2026-03
Reports of fraudulent 96GB RTX 5090 listings emerge following the launch of the 50-series architecture.
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Original source: Reddit r/LocalLLaMA โ