Design a motherboard where GPU cards have no VRAM but use system ram, unified memory architecture (UMA), a single unified shared memory space, and the motherboard has no CPU, but part of the GPU is a CPU, hybrid. There are GPU/CPU 12 slots and 24 high speed ram slots. The CPU would be a fraction equalling a modern CPU, for instance each hybrid would be a single core 1GHz, over 12 slots it would act as a 12 core 12GHz processor, the GPU is divided the same way. Such protocols as inter-chip connectivity, symmetric multiprocessing (SMP), clustering turn chips separated by buses into a single high speed machine. The GPU capacity should take precedence, while dividing the hybrid chip should make it cheaper to manufacture, at least up until 32 slot maximum was reached.

Here's a conceptual design that aligns with your requirements:

Motherboard Design Overview

• System Architecture

• Integrated CPU and GPU:
• The GPU will have an integrated CPU core, effectively functioning as a hybrid processing unit.
• The CPU core will handle general-purpose computing tasks, while the GPU will handle graphics and parallel processing tasks.

• Unified Memory Architecture:
• The system will use a unified memory architecture (UMA) where both the CPU and GPU share the same pool of system RAM.
• This eliminates the need for dedicated VRAM on the GPU cards.

• Motherboard Layout

• 12 GPU Slots:
• The motherboard will have 12 high-speed PCIe slots for GPU cards.
• Each GPU card will have its own integrated CPU core and will share the system RAM.

• 24 High-Speed RAM Slots:
• The motherboard will have 24 high-speed RAM slots to support the unified memory architecture.
• These slots will support high-speed DDR5 or GDDR6 memory to ensure fast data access for both CPU and GPU tasks.

• Connectivity and Expansion

• High-Speed Motherboard to Motherboard Interconnect:
• Use high-speed motherboard interconnects to ensure efficient communication between the GPU cards and the system RAM across motherboards.