A modder named Fabian created a custom GPU by combining an RTX 3070 PCB with an RTX 3070 Ti chip. The goal was to increase the VRAM capacity from 8GB to 16GB. To achieve this, he replaced the existing Samsung HC14 (8Gb) GDDR6 chips with HC16 (16Gb) chips.
The process required reconfiguring the PCB's memory straps using the Nvidia BIOS Reader tool. After soldering, the card was recognized by MATS and GPU-Z as an RTX 3070 Ti with 16GB of GDDR6 memory, mirroring a prototype that appeared years ago.
To verify the performance, Fabian ran a local LLM and Call of Duty: Warzone. The LLM used nearly the entire 16GB pool, and the game consumed more than 13GB of VRAM when paired with a Ryzen 7 9800X3D CPU. The system showed no signs of instability.
In the Unigine Superposition benchmark, the card scored 5,367 points. This result is lower than standard RTX 3070 Ti runs due to the lower memory bandwidth of GDDR6 compared to the stock GDDR6X memory used in retail versions.
