How to Disable Onboard RAM Using BIOS SPD Removal Tool / SPD TOOL

🧠 SPD (Serial Presence Detect) is a small but crucial feature embedded in your computer’s RAM modules. It’s essentially a tiny EEPROM chip that stores detailed information about the memory module, allowing your system to automatically configure itself for optimal performance.

🔍 What SPD Does

• Identifies RAM Specs Automatically: When your PC boots up, the BIOS reads the SPD chip to determine:
  • Memory type (e.g., DDR4, DDR5)
  • Size and number of memory chips
  • Supported speeds and timings (like CAS latency)
  • Voltage requirements
  • Manufacturer and serial number
• Enables Plug-and-Play Memory Configuration: Thanks to SPD, your motherboard can automatically set safe and compatible memory timings without user intervention.
• Supports Overclocking Profiles: SPD can include extended profiles like Intel’s XMP or AMD’s EXPO, which allow users to run RAM at higher-than-default speeds with a single BIOS setting.

🛠️ How It Works

• Communication Protocol: SPD uses the SMBus (a variant of I²C) to communicate with the motherboard. This allows the BIOS or system software to read the SPD data using just two pins: one for clock and one for data.
• Standardized by JEDEC: The format and contents of SPD are defined by JEDEC, the organization responsible for memory standards. This ensures consistency across different RAM manufacturers.

🧪 SPD Speed vs. Tested Speed

If you install RAM and don’t enable XMP/EXPO in BIOS, your system will likely run it at the SPD speed, which is usually lower than the advertised speed.

🧩 Why SPD Matters

• Prevents boot failures due to incompatible memory settings
• Enables accurate system diagnostics and monitoring tools (like CPU-Z or HWinfo)
• Facilitates safe overclocking by providing validated timing profiles

Would you like to dive into how to read SPD data using software tools or how to tweak memory settings in BIOS?