Now that we’ve all read and watched Steam Machine review and benchmarks we can all discuss if there’s real market for this product or not.

I personally think that Valve could have done a true evolution of PC hardware design that isn’t just a custom console.

I used ChatGPT to help me AI-slop my idea of what a future gaming PC platform that abandons ITX limitations and simplifies assembly, design, cooling and eliminates things I find annoying about building a PC.

I believe that Valve could have done this with the massive amount of money they have. The Steam Machine is expensive and not interesting. This would also be expensive but at the very least would actually be something that people would want.

PCG (Personal Computer for Gaming)

Architecture Design Goals and Principles

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1. Purpose

The PCG standard defines a next-generation desktop computer architecture optimized for gaming systems. It replaces legacy ATX-based designs with a modular, blade-oriented layout that simplifies assembly, improves thermal efficiency, and standardizes component integration.

The architecture introduces vertically inserted compute modules, centralized power delivery, and enforced airflow directionality to achieve a system that is:

• Mechanically simplified
• Thermally predictable
• Electrically integrated
• Easily upgradeable

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2. Core Architectural Philosophy

PCG is based on three foundational principles:

2.1 Backplane-Centric Design

All power delivery and interconnects originate from a centralized base unit (PCG-PSU), eliminating traditional cabling.

2.2 Blade-Based Modularity

Core system components are implemented as vertically inserted blades:

• PCG-MB (compute blade)
• PCG-GPU (graphics blade)

2.3 Linear System Alignment

All system vectors are unified:

• Airflow: front → rear
• Component insertion: vertical (top → bottom into baseplane)
• Power delivery: bottom → upward into blades

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3. Primary Design Goals

3.1 Zero Internal Cabling (PCG-ZC1)

The system shall eliminate all internal power and data cables.

Requirements:

• 100% of system power delivered via PSU-integrated backplane
• No discrete GPU power connectors
• No motherboard 24-pin or auxiliary power cables

Benefits:

• Reduced build complexity
• Improved reliability
• Improved airflow consistency

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3.2 Vertical Blade Insertion System (PCG-MECH2)

All primary components shall be installed via vertical insertion into the PSU base.

Requirements:

• PCG-MB and PCG-GPU must insert downward into slot connectors
• Slots must provide:
  • Self-aligning guide rails
  • Controlled insertion force
• Connectors must support blind-mate engagement

Retention Mechanism:

• Each blade must be secured using captive thumb screws at the top of the chassis
• Screws must:
  • Remain attached to the blade or chassis when loosened
  • Provide positive mechanical retention
  • Prevent vibration-induced loosening

Benefits:

• Tool-minimized installation
• Reliable mechanical seating
• Consistent electrical engagement

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3.3 Center-Aligned Blade Architecture (PCG-MOD1)

All major components shall be implemented as parallel blades aligned along the system centerline.

Requirements:

• PCG-MB and PCG-GPU must be:
  • Equal in height envelope
  • Parallel in orientation
  • Symmetrically positioned relative to center airflow axis

Benefits:

• Balanced thermals
• Predictable airflow distribution
• Simplified chassis geometry

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3.4 Integrated Power Base (PCG-PWR1)

The power supply shall function as both:

• System power source
• Structural and electrical backplane

Requirements:

• PSU must expose vertical slot interfaces for:
  • PCG-MB
  • PCG-GPU
• PSU must deliver full system power through blind-mate connectors
• PSU must support high-current delivery suitable for modern GPUs

Benefits:

• Eliminates cable routing
• Enables compact electrical paths
• Improves power delivery efficiency

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3.5 Mandatory Front-to-Rear Airflow (PCG-AIR1)

All PCG systems shall enforce a single airflow direction: front intake to rear exhaust.

Requirements:

• No vertical or cross-axis airflow designs
• All blade cooling solutions must align with airflow direction
• Intake must be located at chassis front
• Exhaust must be located at chassis rear

Benefits:

• Predictable thermal performance
• Reduced turbulence
• Scalable cooling for higher power systems

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3.6 Thermal Zoning and Scalability (PCG-THERM1)

The architecture shall support both low-power and high-power configurations.

Baseline Configuration (Low/Medium Wattage):

• Open airflow between blades
• No mandatory airflow divider
• Standard cooling sufficient

High-Wattage Configuration:

• Optional central divider fin between blades
• Divider isolates airflow channels
• Prevents thermal cross-contamination

Benefits:

• Cost-effective entry systems
• Scalable to high-performance builds
• Flexible thermal design

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3.7 Unified Form Factor (PCG-FORM1)

All primary blades shall conform to a unified dimensional envelope.

Requirements:

• PCG-MB height must match PCG-GPU height
• Blade length must align with chassis airflow path
• Standardized slot spacing and mechanical tolerances

Benefits:

• Mechanical compatibility across vendors
• Simplified chassis manufacturing
• Consistent cooling behavior

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3.8 Slot-Based Interconnect System (PCG-INT1)

All electrical connectivity shall be provided through slot interfaces.

Requirements:

• Slots must provide:
  • Power delivery
  • High-speed data interconnect (PCIe-class or better)
  • Control and signaling
• All connections must be blind-mate capable

Benefits:

• Reduced failure points
• High bandwidth potential
• Clean system integration

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3.9 Simplified User Experience (PCG-UX1)

The system shall be designed for ease of assembly and upgrade.

Requirements:

• Component installation via vertical insertion
• Retention via captive thumb screws
• Clear component naming:
  • PCG-MB
  • PCG-GPU
  • PCG-PSU
  • PCG-CASE

Benefits:

• Faster builds
• Reduced user error
• Improved accessibility

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3.10 Chassis-Decoupled Front I/O (PCG-IO1)

Front I/O shall be defined as a chassis-level feature rather than a motherboard dependency.

Requirements:

• Front I/O modules are optional and case-provided
• Motherboard I/O must terminate at rear of chassis

Benefits:

• Increased chassis design flexibility
• Improved upgrade independence

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3.11 Mechanical Simplicity and Manufacturability (PCG-MECH1)

The architecture shall minimize mechanical complexity.

Requirements:

• Vertical guide rails for blade alignment
• Blind-mate connector tolerance compliance
• Reduced reliance on loose fasteners
• Use of captive retention hardware

Benefits:

• Lower manufacturing cost
• Improved durability
• Easier assembly automation

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4. Summary

The PCG standard redefines desktop PC architecture by:

• Eliminating internal cables
• Using vertically inserted modular blades
• Centralizing power and interconnects in a baseplane
• Enforcing linear airflow
• Standardizing mechanical retention

The result is a system that is:

• Cleaner
• More efficient
• Easier to assemble
• Scalable across performance tiers

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5. Future Work

Further specification is required for:

• Slot connector electrical pinout
• Power delivery limits and rail definitions
• Mechanical tolerances and insertion force limits
• Cooling interface standards
• Compliance and certification requirements

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