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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. Such protocols as inter-chip connectivity, symmetric multiprocessing (SMP), clustering turn chips separated by buses into a single high speed machine. The GPU should take precedence, with the CPU being older and cheaper revisions.

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.