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Tom’s Hardware
Tom’s Hardware
Technology
Zhiye Liu

$142 upgrade kit and spare modules turn Nvidia RTX 4090 24GB to 48GB AI card — technician explains how Chinese factories turn gaming flagships into highly desirable AI GPUs

Nvidia Memory United States China
GeForce RTX 4090 mod.

Remember those Frakenstein GeForce RTX 4090 48GB graphics cards emerging from China? Russian PC technician and builder VIK-on has provided detailed insights into how Chinese factories are transforming the GeForce RTX 4090, once regarded as one of the best graphics cards, to effectively double its memory capacity specifically for AI workloads.

As a mainstream product, the GeForce RTX 4090 does not support memory chips in a clamshell configuration, unlike Nvidia's professional and data center products. Essentially, this means that the Ada Lovelace flagship only houses memory chips on one side of the PCB. In clamshell mode, graphics cards typically feature memory chips on both sides of the PCB. This limitation is addressed by the GeForce RTX 4090 4GB "upgrade kit," which sells for around $142 in China.

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