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This alleged RTX 4090Ti or RTX Titan Ada graphic card was supposed to feature a full-size AD102 chip, which would be almost twice the size of the one that is found in the RTX 4090, and would require two 16-pin power connectors to make it function. In fact, leakers say that even the base clock version of this setup would have a TDP of around 600-700W and require a dedicated power supply of its own.
It would also need a massive cooling rig just to keep it functional, which would balloon the size of the graphic card so much that it would cover four slots in your motherboard. This would make it impossible to fit in most conventional rigs that are available on the market.
The power requirements and size are only half the concern, as rumours suggest that the card in testing was so unwieldy when it comes to thermal input and output that just running a regular benchmark was causing it to trip breakers, damage power supplies, and even set itself on fire.
If all of these weren't enough problematic issues in themselves, the card also suffered from memory bottlenecks, which would require entirely new modules to be invented just to make it functional. Theoretically, you would need at least 27GBPS GDDR6 memory or even next-gen GDDR7 modules to make the ADA version a reality.
Considering the already hyper-inflated price of the 4090, we don't think anyone would have been able to afford the card, even if they had somehow managed to make it work. For all these reasons and more, NVIDIA seems to have backed off on the testing and shelved the Ti versions until an undetermined future date.