Vedhathiri
Author
YouTube creator Zac Builds has modified a Nintendo 64 by combining several hardware upgrades aimed at making the nearly 30-year-old console more practical to use with modern displays and accessories. The project retains the original N64 motherboard while adding a RetroGEM HDMI modification, USB-C-based power delivery, internal wireless controller support, CPU overclocking and improved cooling. Because the additional electronics could not fit comfortably inside the original enclosure, Zac Builds also designed a new custom 3D-printed case. Before installing the modifications, the console was disassembled, the cartridge slot was cleaned, the motherboard was inspected for aging components, and the original heatsinks and thermal material were removed.
For video output, the build uses a RetroGEM board connected directly to the N64's GPU/video signals. The modification provides HDMI output and allows the video signal to be processed with features such as upscaling, de-interlacing and image smoothing. The original power arrangement is replaced with a compact USB-C Power Delivery system. A USB-C PD trigger board requests 12V from a compatible power adapter, while a buck converter generates the 3.3V supply used by the N64's main power system. Wireless controller support is added with BlueRetro firmware running on an ESP32, connected internally to the console's controller-port connections. The CPU is also fitted with a QSB-based overclocking modification that increases the clock speed by more than 30%. The overclock can be enabled or disabled using the reset button, while a two-color LED indicates the operating mode: red for the standard clock and blue for the overclocked mode. Because the higher clock speed can increase heat output, the build adds finned copper heatsinks, K5 Pro thermal material and a 40 mm fan for active cooling. The creator notes that overclocking does not work equally well with every game or setup.
The additional hardware also required substantial mechanical changes. Zac Builds removes the original AV connector, modifies the motherboard's outer section to create clearance for the new power wiring, and designs a custom enclosure with mounting features for the HDMI hardware, power circuitry, wireless controller electronics, cooling fan and switches. The finished case is produced as a clear 3D-printed enclosure. For game loading, the project uses SummerCart64, an open-source N64 flash cartridge that supports SD-card game storage and Nintendo 64DD games. During testing, the CPU overclock is demonstrated with games including Star Wars: Rogue Squadron and Perfect Dark, where the higher clock speed can improve performance in situations affected by low frame rates. The RetroGEM output is also tested at 1080p with de-interlacing and smoothing enabled. The completed project brings together console modding, digital video processing, USB-C power electronics, ESP32-based wireless connectivity, CPU overclocking, thermal management and 3D CAD into a single redesigned Nintendo 64.
