Brazilian Modder Creates Custom RTX 3070 Ti with 16GB VRAM
In a remarkable feat of hardware engineering, Brazilian modder fmklab has successfully built a fully functional NVIDIA GeForce RTX 3070 Ti graphics card equipped with 16GB of memory—a configuration that NVIDIA reportedly considered but never released to the public. This custom graphics card not only demonstrates technical expertise but also offers a glimpse into what could have been a highly sought-after GPU variant for enthusiasts and professionals alike.
How the 16GB RTX 3070 Ti Was Built
Rather than simply upgrading the memory chips on a standard RTX 3070 Ti, fmklab took a more sophisticated approach. The project began with an ASUS TUF RTX 3070 PCB, which uses standard GDDR6 memory instead of the faster GDDR6X found on the retail 3070 Ti. The original RTX 3070 GPU was carefully removed and replaced with a genuine 3070 Ti chip. To double the memory capacity, the stock Samsung HC14 (8 Gb) modules were swapped out for higher-capacity HC16 (16 Gb) chips.
After the hardware modifications, the system initially recognized only 8GB of VRAM. Using NVIDIA's BIOS Reader tool, fmklab identified the necessary memory straps that required rewiring. With a few precise adjustments, the graphics card finally reported the full 16GB memory buffer.
Performance and Stability Testing
Once the memory upgrade was complete, the card underwent rigorous testing. MATS (Memory Access Test Suite) results came back clean, confirming the stability of the new configuration. The custom RTX 3070 Ti was able to run a local large language model (LLM) utilizing nearly the entire 16GB memory pool. In gaming scenarios, such as Call of Duty: Warzone paired with a Ryzen 7 9800X3D processor, the card used over 13GB of VRAM without any instability or crashes.
The Story Behind the 16GB RTX 3070 Ti
Rumors and leaks have suggested that NVIDIA explored a 16GB version of the RTX 3070 Ti as early as 2020. Engineering samples with this configuration reportedly existed, but the project was ultimately shelved before reaching the consumer market. While the base RTX 3070 has seen similar VRAM modifications in the past, this appears to be the first successful recreation of a 16GB RTX 3070 Ti using authentic components.
In benchmark testing, the custom card's Superposition score was slightly lower than that of a standard retail RTX 3070 Ti, likely due to the use of GDDR6 memory instead of the faster GDDR6X. However, the tradeoff for doubling the VRAM capacity is significant, especially for workloads that benefit from larger memory buffers.
Implications for the PC Hardware Community
This project highlights the ingenuity and technical skill within the PC modding community. By bringing to life a graphics card that NVIDIA never officially released, fmklab has provided valuable insights into GPU hardware capabilities and the potential benefits of increased VRAM for gaming and professional applications. As memory-intensive workloads become more common, such custom modifications may inspire further innovation among enthusiasts and professionals seeking to push the boundaries of existing hardware.
