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Overclockers from Xtreme Systems have developed an external clock generation technique for the RTX 5090 using the Elmor External Clock Board (ECB), bypassing Nvidia's software-imposed limitations on VRAM and crossbar clock speeds. The method, still a work in progress, involves hardware-level signal injection to push GPU clocks beyond factory limits, yielding notable benchmark improvements.
A user seeks community feedback on purchasing a modded RTX 4090 with 48GB VRAM from GpuWorld.eu, asking for trustworthy sources and alternative sellers like Taobao.