NVIDIA's GeForce RTX 5090 GPU comes with 32 GB of GDDR7 memory by default. However, Chinese modders have experimented with equipping large memory capacities before, especially with the last-generation RTX 4090, which comes in at 96 GB of GDDR6X. This time, the current-generation top-end "Blackwell" consumer GPU, the RTX 5090, gets not double, not triple, but quadruple the memory capacity in the latest mod. According to @I_Leak_VN, the GPU has an astonishing 128 GB of GDDR7 memory and is priced at $13,200. That is over six times the MSRP, for a four times memory increase.

The big-picture question is what is done to the GPU to support this much memory. Currently, no GDDR7 memory modules are surpassing 24 Gbit, or about 3 GB per module, with the smaller capacity ones coming at 16 Gbit, or 2 GB per module. The largest configuration that a dual-sided, sandwiched approach to the PCB modding could support is 96 GB. That is exactly how NVIDIA's ProViz RTX PRO 6000 Blackwell GPU gets its 96 GB GDDR7 capacity. However, given that there are no 4 GB GDDR7 modules, we can only assume that some serious PCB modification was made to accommodate all the modules. Most likely, a PCB riser, tucked away somewhere, or any other interesting solution could be at play. You can take a look at NVIDIA-SMI output, which clearly shows the 128 GB capacity below.