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HP Z640 Workstation - Statement of Volatility

HP confirms that Intel-based Z640 personal workstation contains DDR RAM volatile memory (memory amount depends on the customer configuration). In addition, the motherboard in the condition originally shipped without subsequent modification or the addition or installation of any applications, features, or functionality, contain the following nonvolatile memory: PCH Real Time Clock (RTC) battery backed-up configuration memory (256 Bytes), Super I/O battery backed-up configuration memory (16 Bytes), masked keyboard ROM (2K Bytes), DIMM Serial Presence Detect (SPD) configuration data (256 Bytes per module, 128 Bytes programmable), TPM module (2.35 kB), and Serial Flash IC for System BIOS (128M Bits).
The volatile memory is cleared by removing power from the system for greater than 30 seconds. The nonvolatile memory on the motherboard is restored by following the steps below:
  1. If TPM Ownership has been taken enter F10 setup.
  2. Navigate to the Security tab.
  3. Select TPM Embedded Security > TPM Clear > Clear.
  4. Save and exit BIOS.
  5. Press F1 when prompted to accept the clearing of the TPM nonvolatile memory.
  6. Download the latest BIOS for this system and operating system off of the HP website.
  7. Follow the instructions on the website to flash the BIOS. This will clear all settings and passwords related to the BIOS.
  8. Power down the system and remove the AC power cord. The RTC and Super I/O battery backed-up memory is cleared by removing the battery found on the motherboard, allowing the board to sit for greater than 60 seconds, and then replacing the battery.
The DIMM SPD EEPROM is not readily available to the user, however there appear to be tools publicly available to read and write this part. To eliminate the possibility that it could contain sensitive information, remove the DIMMs or use one of these tools.

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