A two-word X post just 'confirmed' a 96GB RTX 5090

Greg Sky repairs graphics cards in Grand Rapids, Michigan, and sells 48GB RTX 4090 upgrades out of a rework shop called GPU Lab. At the end of October he posted a two-word claim on X: "64 and 96gb 5090 confirmed." No photograph of either card, no benchmark, no detail on how firmware would address the extra memory.

The arithmetic is the easy half

The stock GeForce RTX 5090 carries 32GB of GDDR7 as 16 modules of 2GB each on a 512-bit bus. TweakTown's walkthrough doubles that to 32 modules in a clamshell layout, chips on both sides of the PCB, which lands on 64GB. Swap every position for a 3GB GDDR7 part and the count reaches 96GB, the same capacity as NVIDIA's RTX PRO 6000 Blackwell workstation card. Nothing in that chain is exotic: modders have reworked consumer memory for years, and 3GB GDDR7 modules have already been on sale in China, with SK hynix saying it is working on its own.

Capacity is not a working card

The hard part starts after the last chip is reflowed. The video BIOS and driver stack expect a specific memory configuration, and Sky has said nothing about how a 64GB or 96GB board would present itself to NVIDIA's driver. eTeknix is blunt: "so far, there is no evidence that anyone has managed to get a GeForce RTX 5090 with 64 GB or 96 GB ... working." TweakTown's own summary says the claim is unverified. Sky's timeline is the reason for caution. Days earlier he wrote "There is no 96GB 5090," while teasing that a group in China had spent more than a year on it. He is reportedly in China now, collecting SMT equipment to bring modding work to the US.

What $3,200 of memory buys

In a follow-up on the same thread, Sky put 3GB GDDR7 at "like 100$ per module," so 32 of them is roughly $3,200 in memory alone, before any labour and before the donor card. eTeknix makes the comparison that matters: add it up and the total sits not far from an RTX 6000 Pro, which is why the mod makes sense in a market where that card cannot be bought, or for someone who already owns a 5090. Precedent exists. 48GB RTX 4090s sold in China for around $3,400, TweakTown reports. The claim spread regardless, with the r/LocalLLaMA thread reaching the top of a subreddit full of people who would happily buy 96GB for local inference.

Sky says more details are coming over the next few months. Until a modified card boots, enumerates its memory and survives a training run, "confirmed" means one technician's word, not a shipping product.