You may have heard a rumor that an RTX 5090 with 128GB is in development, or is prototyped at the very least. This is based on a screenshot of a command prompt returning GPU specs details via the nvidia-smi command. This was recently shared by @I_Leak_VN on X. The user claims to have been sent details of a prototype “super limited” RTX 5090 worth ~$13,200 USD featuring 128GB of VRAM. However, such a spec seems implausible.

We can’t say whether the screenshot is faked in any way, but it would be easy enough to do, either with photo editing tools or by modifying the firmware to report false specs. Regardless, the original source remains unnamed, and there is no proof of the physical hardware used so far.

Prototype for an RTX 5090 with 128GB of VRAM?

Based on Nvidia’s official models, the maximum configuration for the GB202 GPU die in the RTX 5090 is 96GB. We know this because Nvidia released its workstation RTX Pro 6000 graphics card with this much VRAM earlier this year. Supporting more than this would require a wider memory bus, which seems out of the question.

As per the post, this prototype model is not close to “anything on the market,” and there’s probably a good reason for that. The anonymous tip suggests it features GDDR7X memory (the RTX 50 series right now uses GDDR7), which remains unannounced. The 550.144.03 Driver Version listed at the top of the nvidia-smi report also doesn’t support the RTX 50 series, which started at the version 570 branch.

We already know that GDDR7 RAM is available in 16GB and 24GB capacities (2GB and 3GB modules, respectively), with the latter supposedly facilitating the leaked RTX 50 series Super upgrade for more VRAM. The important detail is that there is no evidence of DRAM with 32GB (4GB) density, which is what would be required to achieve 128GB on the RTX 5090. Prominent tipster (though they don’t like to be called that) @harukaze5719 shares the same sentiment.

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Jack Goodall

At PC Guide, Jack is mostly responsible for reporting on hardware deals. He also specializes in monitors, TVs, and headsets and can be found putting his findings together in a review or best-of guide.