Technicians upgrade consumer Nvidia RTX 4090 graphics cards to 48GB of VRAM

Technicians at GPU Lab have successfully upgraded standard 24GB Nvidia GeForce RTX 4090 graphics cards to 48GB of VRAM. This process involves desoldering the original memory modules and GPU core from the stock PCB, then transplanting them onto a custom PCB designed to accommodate double the memory capacity. The modification requires precise BGA rework, including the use of a BGA rework station, flux, and a stencil to apply new solder spheres to the memory modules and GPU core. The technicians use an infrared oven to reflow the components, ensuring a consistent and repeatable heating curve. The upgraded cards are then cleaned in an ultrasonic cleaner and baked to ensure moisture removal. Testing with the memtest_vulkan tool confirms the 48GB cards operate within expected parameters, achieving memory bandwidth speeds of approximately 850GB/s under full stress loads, which is consistent with the performance of standard 24GB RTX 4090 models. This modification is intended for high-density compute workloads and LLM training, where increased VRAM capacity is critical.

Technicians successfully doubled the VRAM capacity of Nvidia RTX 4090 graphics cards from 24GB to 48GB. The upgrade process requires desoldering the original GPU core and memory modules from the stock PCB.

A custom PCB is used to accommodate the additional memory modules required for the 48GB configuration. The modification process utilizes a BGA rework station and infrared oven for precise component soldering.

Testing with memtest_vulkan confirms the upgraded cards maintain performance levels consistent with standard RTX 4090 models. The upgraded cards are intended for specialized high-density compute and AI model training applications.