Techie makes his own motherboard to refurbish 15-year-old HP ProLiant N40L tower server — Raspberry Pi CM5 adds NVMe and USB 3.0

Techie makes his own motherboard to refurbish 15-year-old HP ProLiant N40L tower server — Raspberry Pi CM5 adds NVMe and USB 3.0

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EastMakes didn't want to trash the N40L, but it had zero NVMe slots, only USB 2.0 ports, and its once-laudable power consumption figures are rather unimpressive today. Needless to say, the computing power on offer was, at lack of a better word, minimal, as even back then the onboard AMD Turion II chip barely outran a pocket calculator. Even a contemporary Raspberry Pi can outperform the original hardware on all fronts, plus use a frugal amount of watts while doing so.

Watch On The CM5 is exactly the same as a standard Raspberry Pi 5, except it doesn't have any ports and is meant to be used with external accessories that provide them. Oftentimes, budding enthusiasts will use it with its premade corresponding I/O PCB. EastMakes did start with that board, but taking advantage of the Raspberry Pi project's open-source nature, he took the original diagrams and documentation and rolled his own variation.

The tech wizard extended the board to fit the area the original ProLiant N40L used, and printed a simple plastic 3D prototype to ensure he got the port and screw-hole locations just right. From thereon, he moved onto optimizations like trimming down to just the one HDMI port, and adding a connector stack with the Ethernet port and two USB 3.0 Type-A connectors.

He also wired an NVMe slot to the PCB for a system drive, and spent some time with trace lengths to ensure they all matched, as to not come up against any timing issues. Although EastMakes didn't go as far as adding RGB lighting, he did add a little pizzazz by way of choosing a yellow-on-black finish for his new motherboard, using PCBWay's custom configurator. Boop and Reboop switches were added as well.

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