Bitluni's 8,192-Core DIY GPU Is Built From 13-Cent RISC-V Chips

Short summary

Bitluni built a DIY GPU from 8,192 WCH CH570 RISC-V microcontrollers costing ~$0.13 each, organized into 32-chip groups managed by CH32V controllers on modular PCB blades. The project revealed hard lessons in clock distribution, cross-talk, power delivery (650 A on a 3.3 V rail), and firmware flashing at scale. The practical takeaway: clock fan-out and signal integrity problems appear even at small scale, so start with two boards on a shared bus before scaling up.

• •8,192 CH570 RISC-V chips (~$0.13 each) wired into a parallel array acting as a GPU
• •Key engineering challenges: clock distribution, cross-talk, 650 A power delivery, automated firmware flashing
• •Advice: start with 2 microcontrollers on shared I2C and observe failure modes before scaling

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