Domestic modification of 4090 with 48gb of ram
4090 graphics cards came with 24gb of memory. As the AI boom sucked up everything on the market, some modders (mostly in China) learned you could upgrade the VRAM on a 4090 from 24GB to 48GB. These mods were often done poorly and had high failure rates; but more quality modders come online – including these guys in Michigan that seem to be reputable and stand behind their modding.
Still, it’s an odd world – the world is quickly aligning to standards of fitting their models into 32, 96, 128, or 256 of ram so these might not be as interesting as they once were. Still, someone locally was selling one of their cards recently.