Proprietary custom shape used in specific HP desktop series. Processor and Memory
: Some users have reported successfully running up to 64 GB (2 x 32 GB) using compatible modules. Processor Compatibility hp 8653 motherboard
Uses a non-standard proprietary 4-pin/7-pin power connector instead of a standard 24-pin ATX, making aftermarket power supply upgrades difficult without adapters. Processor Compatibility The board is optimized for processors with a TDP up to 65W Supported CPUs: Proprietary custom shape used in specific HP desktop series
If you want, I can:
Because HP discontinued this board around 2002, new old stock (NOS) is virtually extinct. Your options include: hp 8653 motherboard